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  • Other Sources  (303)
  • MECHANICAL ENGINEERING  (303)
  • 2015-2019
  • 1990-1994
  • 1975-1979  (303)
  • 1977  (178)
  • 1976  (125)
  • 1
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    A practical magnetic bearing (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A small compact magnetic bearing design developed and tested features a bearing capable of supporting over ten times its own weight, dimensioned 8 cm diam by 3.75 cm, with rare-earth cobalt magnets. Only 1% of the device payload figures as part of the magnetic suspension. The design is servoed in two axes and exhibits inherent stability in three more degrees of freedom, with full rotational freedom in the desired axis. Capacitive radial gap sensing allows stiff servoing of the rotation axis. Differential sensing and EM control linearize control functions. Low power drain, simple fabrication and assembly, and larger clearances than in air bearings or ball bearings are reported
    Keywords: MECHANICAL ENGINEERING
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  • 2
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    An estimation of the effect of fluid inertia on the performance of the plane inclined slider thrust bearing with particular regard to turbulent lubrication (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: MECHANICAL ENGINEERING
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  • 3
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    Nonlinear flap-lag axial equations of a rotating beam (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: It is possible to identify essentially four approaches by which analysts have established either the linear or nonlinear governing equations of motion for a particular problem related to the dynamics of rotating elastic bodies. The approaches include the effective applied load artifice in combination with a variational principle and the use of Newton's second law, written as D'Alembert's principle, applied to the deformed configuration. A third approach is a variational method in which nonlinear strain-displacement relations and a first-degree displacement field are used. The method introduced by Vigneron (1975) for deriving the linear flap-lag equations of a rotating beam constitutes the fourth approach. The reported investigation shows that all four approaches make use of the geometric nonlinear theory of elasticity. An alternative method for deriving the nonlinear coupled flap-lag-axial equations of motion is also discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: AIAA Journal; 15; June 197
    Format: text
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  • 4
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    Ion beam texturing (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A microscopic surface texture was created by sputter-etching a surface while simultaneously sputter-depositing a lower sputter yield material onto the surface. A xenon ion-beam source was used to perform the texturing process on samples as large as 3-cm diameter. Textured surfaces have been characterized with SEM photomicrographs for a large number of materials including Cu, Al, Si, Ti, Ni, Fe, stainless steel, Au, and Ag. A number of texturing parameters are studied including the variation of texture with ion-beam powder, surface temperature, and the rate of texture growth with sputter etching time.
    Keywords: MECHANICAL ENGINEERING
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  • 5
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    Simplified solution for elliptical-contact deformation between two elastic solids (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A linear regression by the method of least squares is made on the geometric variables that occur in the equation for elliptical-contact deformation. The ellipticity and the complete elliptic integrals of the first and second kind are expressed as a function of the x,y-plane principal radii. The ellipticity was varied from 1 (circular contact) to 10 (a configuration approaching line contact). The procedure for solving these variables without the use of charts or a high-speed computer would be quite tedious. These simplified equations enable one to calculate easily the elliptical-contact deformation to within 3 percent accuracy without resorting to charts or numerical methods.
    Keywords: MECHANICAL ENGINEERING
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  • 6
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    Acton mass flow system applied to PFBC feed (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Dense phase pneumatic conveying and the Acton Mass Flow concept are defined with emphasis on the specific advantages to the coal and dolomite feed to the Pressurized Fluidized Bed Combustor. The transport and feed functions are explored with a comparison of designing the process for a combined function or for individual functions. The equipment required to accomplish these functions is described together with a typical example of sizing and air or gas requirements. A general outline of the control system required to obtain a uniform feed rate is provided. The condition of the coal and dolomite and conveying gas as required to obtain reliable transport and feed will be discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 636-652
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  • 7
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    Storage and feeding of coal (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Reliable feeding of coal from storage bins to process requires the knowledge of the behavior of coal during flow. The study of the flow of bulk solids was undertaken in the 1950's and led to the development of flow ability testing equipment and of the Mass Flow concept of design for reliable flow. The theory has since been expanded to two-phase, solids-gas system, and has found world wide application in the design of storage and feeding systems.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 571-585
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  • 8
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    Feeding the feeder (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Too often the equipment used to move difficult to handle powdery material from a hopper to process creates a complex of devices whose end result falls short on good performance...simply because equipment design, in many cases, has not kept up with advanced technological concepts in fine powder handling. The Feeder, being the key to an efficient feed system, must be assured a continuous flow from the storage tank...without bridging, arching, spasmodic flow or uncontrolled flushing. The causes and effects of flow problems are discussed and also solutions are offered based on the combination of theoretical and practical experience.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 480-491
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  • 9
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    Babcock and Wilcox's experience with two-phase flow mixtures of coal and gas (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The performance of pulverized coal injection systems in operation on blast furnaces is described in terms of application to coal gasification, fluidized bed combustion, and magnetohydrodynamics.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 389-410
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  • 10
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    Lock hopper values for coal gasification plant service (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Although the operating principle of the lock hopper system is extremely simple, valve applications involving this service for coal gasification plants are likewise extremely difficult. The difficulties center on the requirement of handling highly erosive pulverized coal or char (either in dry or slurry form) combined with the requirement of providing tight sealing against high-pressure (possibly very hot) gas. Operating pressures and temperatures in these applications typically range up to 1600 psi (110bar) and 600F (316C), with certain process requirements going even higher. In addition, and of primary concern, is the need for reliable operation over long service periods with the provision for practical and economical maintenance. Currently available data indicate the requirement for something in the order of 20,000 to 30,000 open-close cycles per year and a desire to operate at least that long without valve failure.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of The Conf. on Coal Feeding Systems; p 702-709
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  • 11
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    Rocketdyne's advanced coal slurry pumping program (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Rocketdyne Division of Rockwell International Corporation is conducting a program for the engineering, fabrication, and testing of an experimental/prototype high-capacity, high-pressure centrifugal slurry feed pump for coal liquefaction purposes. The abrasion problems in a centrifugal slurry pump are primarily due to the manner in which the hard, solid particles contained in the slurry are transported through the hydraulic flow passages within the pump. The abrasive particles can create scraping, grinding, cutting, and sandblasting effects on the various exposed parts of the pump. These critical areas involving abrasion and impact erosion wear problems in a centrifugal pump are being addressed by Rocketdyne. The mechanisms of abrasion and erosion are being studied through hydrodynamic analysis, materials evaluation, and advanced design concepts.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 624-635
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  • 12
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    Evacuation of coal from hoppers/silos with low pressure pneumatic blasting systems (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The need for an efficient, economical, effective and quiet device for moving coal and other difficult bulk solids was recognized. Thus came the advent of the low pressure pneumatic blasting system - a very efficient means of using a small amount of plant air (up to 125 PSI) to eliminate the most troublesome material hang-ups in storage containers. This simple device has one moving part and uses approximately 3% of the air consumed by a pneumatic vibrator on the same job. The principle of operation is very simple: air stored in the unit's reservoir is expelled directly into the material via a patented quick release valve. The number, size, and placement of the blaster units on the storage vessel is determined by a series of tests to ascertain flowability of the problem material. These tests in conjunction with the hopper or silo configuration determine specification of a low pressure pneumatic blasting system. This concept has often proven effective in solving flow problems when all other means have failed.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 493-516
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  • 13
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    Design and development of a solar array drive (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The design and development of a dry lubricated direct solar array pointing mechanism is discussed from its inception in 1970 to its present development into a flight mechanism for use on the Orbital Test Satellite (OTS), MAROTS, European Communication satellite and others. Results of life testing the original prototype and the OTS mechanism are presented together with an appraisal of expected future development.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 223-240
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  • 14
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    Focus drive mechanism for the IUE scientific instrument (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A compact, lightweight mechanism was developed for in-orbit adjustment of the position of the secondary mirror (focusing) of the International Ultraviolet Explored telescope. This device is a linear drive with small (.0004 in.) and highly repeatable step increments. Extremely close tolerances are also held in tilt and decentering. The unique mechanization is described with attention to the design details that contribute to positional accuracy. Lubrication, materials, thermal considerations, sealing, detenting against launch loads, and other features peculiar to flight hardware are discussed. The methods employed for mounting the low expansion quartz mirror with minimum distortion are also given.
    Keywords: MECHANICAL ENGINEERING
    Type: The 11th Aerospace Mech. Symp.; p 213-221
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  • 15
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    Positive commandable oiler for satellite bearing lubrication (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The results of a feasibility study showed that on-orbit commandable lubrication of ball bearings can be accomplished by direct oil application to the moving ball surfaces. Test results for the lubricant applicator portion of the system are presented, in conjunction with a design approach for the reservoir and metering components.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 87-95
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  • 16
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    Fly-away restraint pin mechanism for the Army's PATRIOT missile system (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The development of the longitudinal restraint mechanism for the Army's Patriot missile system is reviewed. The initial design was an ordnance pin puller with a shear plane. Because of reliability problems and a desire to reduce cost, a fly-away restraint mechanism was chosen. After being manually unlocked, the restraint pin disengages the missile during launch by missile motion.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 35-44
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  • 17
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    Scanning and focusing mechanisms of METEOSAT radiometer (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two mechanisms, both of screw-jack type are described. The scanning mechanism, an oil lubricated and sealed unit drives and accurately positions the telescope of the METEOSAT radiometer. The dry lubricated focusing mechanism is used to adjust the focus of this telescope. The METEOSAT program is nearly completed, and the first flight model will be launched at the end of the year.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 13-22
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  • 18
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    Wear-resistant ball bearings for space applications (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Ball bearings consisting of steel parts of which the rings are coated with hard, wear resistant, chemical vapor deposited TiC are described. Experiments conducted in ultrahigh vacuum, using cages of various materials with self-lubricating properties, show that such bearings are suitable for space applications. The results of laboratory tests on the ESA Meteosat Radiometer Focalizing mechanism, which contains six coated bearings, are summarized.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Res. Center The 11th Aerospace Mech. Symp.; p 121-131
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  • 19
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    The use of twin screw extruders for feeding coal against pressures of up to 1500 PSI (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Recent tests with a twin-screw, co-rotating extruder which was successfully used to convey and feed coal against pressures of up to 1500 psi are described. Intermeshing and self-wiping, co-rotating twin-screws give greatly improved conveying and pressure built-up capabilities and avoid hangup and eventual decomposition of coal particles in the screw flights. The conveying action of intermeshing, self-wiping, co-rotating extruder systems approaches that of a positive displacement pump. With this feature, it is possible to maintain very accurate control over all aspects of product conveyance in the extruder, i.e., intake, conveyance and pressure buildup.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 689-701
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  • 20
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    Material handling systems for the fluidized-bed combustion boiler at Rivesville, West Virginia (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The 300,000 lbs/hr steam capacity multicell fluidized-bed boiler (MFB) utilizes complex material handling systems. The material handling systems can be divided into the following areas: (1) coal preparation; transfer and delivery, (2) limestone handling system, (3) fly-ash removal and (4) bed material handling system. Each of the above systems are described in detail and some of the potential problem areas are discussed. A major potential problem that exists is the coal drying system. The coal dryer is designed to use 600 F preheated combustion air as drying medium and the dryer effluent is designed to enter a hot electrostatic precipitator (730 F) after passage through a cyclone. Other problem areas to be discussed include the steam generator coal and limestone feed system which may have operating difficulties with wet coal and/or coal fines.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 604-623
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  • 21
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    High pressure rotary piston coal feeder (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: This feeder concept uniquely combines the functions of solids feeding, metering, and pressurization into one compact system. Success with the rotary-piston concept would provide a lower-cost alternative to lock-hopper systems. The design of the feeder is presented, with special emphasis on the difficult problem of seal design. Initial tests will be to check seal performance. Subsequent tests will evaluate solids-feeding ability.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 537-549
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  • 22
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    A novel dry coal feeding concept for high-pressure gasifiers (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A novel dry coal feeding concept was developed for injecting ground coal into high-pressure gasifiers. Significant power savings are projected because the coal is injected directly with a ram and there is no requirement for pumping large volumes of gas or fluid against pressure. A novel feature of the concept is that a new seal zone is formed between the ram and injection tube each cycle. The seal zone comprises a mixture of a small quantity of finely ground coal and a fluid. To demonstrate the feasibility of the concept, coal was injected into a 1000-psi chamber with an experimental device having a 7-1/2-inch-diameter ram and a 28-inch-long stroke.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 466-479
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  • 23
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    Evaluation of ERDA-sponsored coal feed system development (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Coal feeders were evaluated based upon criteria such as technical feasibility, performance (i.e. ability to meet process requirements), projected life cycle costs, and projected development cost. An initial set of feeders was selected based on the feeders' cost savings potential compared with baseline lockhopper systems. Additional feeders were considered for selection based on: (1) increasing the probability of successful feeder development; (2) application to specific processes; and (3) technical merit. A coal feeder development program is outlined.
    Keywords: MECHANICAL ENGINEERING
    Type: Proc. of the Conf. on Coal Feeding Systems; p 324-355
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  • 24
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    Foster-Miller's development of dry coal feed systems (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Dry coal feeder systems developed for pressurized conversion processes were carried through a laboratory scale development program. These concepts include: (1) a centrifugal solids feeder; (2) a fluidized piston feeder; (3) a linear pocket feeder; and (4) a compacted coal plug feeder. Results of laboratory model testing of all concepts are reviewed.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 285-323
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  • 25
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    Comparative description of coal feeding systems for fixed bed pressure gasification (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Coal feeding systems are discussed which are capable of feeding 20-100 T/H and the range of pressure is up to 100 bar. Most emphasis is placed on dry feeding systems. The systems outlined are subdivided into continuous and intermittent and the influence of each system on lock gas losses and reactor design is shown. Finally a cost estimate is presented which indicates the areas of preferred application and permits conclusions to be drawn regarding the economics of the various systems.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 134-163
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  • 26
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    Focus drive mechanism for the IUE scientific instrument (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A compact, lightweight mechanism was developed for in-orbit adjustment of the position of the secondary mirror (focusing) of the International Ultraviolet Explorer telescope. This device is a linear drive with small and highly repeatable step increments. Extremely close tolerances are also held in tilt and decentering. The unique mechanization is described with attention to the design details that contribute to positional accuracy. Lubrication, materials, thermal considerations, sealing, detenting against launch loads, and other features peculiar to flight hardware are discussed. The methods employed for mounting the low expansion quartz mirror with minimum distortion are also given. Results of qualification and acceptance testing, are included.
    Keywords: MECHANICAL ENGINEERING
    Type: The 11th Aerospace Mech. Symp.; p 207-215
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  • 27
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    Design and development of a solar array drive (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The design and development of a dry lubricated direct drive solar array pointing mechanism is discussed for use on the Orbital Test Satellite (OTS), MAROTS, European Communication Satellite (ECS), and others. Results of life testing the original prototype and the OTS mechanism are presented together with an appraisal of expected future development.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Res. Center The 11th Aerospace Mech. Symp.; p 217-235
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  • 28
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    Some developments in the feeding of coal to fluidized bed combustors (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Research is being done in the development of fluid bed combustors for high sulphur coal, using limestone or dolomite in the bed for removal of the sulphur. Operating units to date have proven the inadequacies of available material handling techniques for introduction and control of the coal and adsorbent to the beds. Larger units now being contemplated will pose formidable problems in this area. Some of the techniques which were developed for the existing pilot units and novel ideas under consideration for future, large production units are illustrated and described.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 653-674
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  • 29
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    Injection of coal by screw feed (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The use of the screw feeder for injecting solids through a 20 to 30 psi barrier is common practice in the cement making industry. An analytical extrapolation of that design, accounting for pressure holding characteristics of a column of solids, shows that coal can be fed to zones at several hundred psi with minimal or no loss of gas. A series of curves showing the calculated pressure gradient through a moving column of solids is presented. Mean particle size, solids velocity, and column length are parameters. Further study of this system to evaluate practicality is recommended.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 586-603
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  • 30
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    Slurry pumping techniques for feeding high-pressure coal gasification reactors (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Operating experience in pumping coal and coal char slurries at pressures up to 1500 psig is discussed. The design specifications for the mixing tanks, pumps, piping, and slurry heaters are given along with pressure drop and minimum flow velocity data on water-lignite slurries.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 165-181
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  • 31
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    Coal pressurization and feeding: Use of a lock hopper system (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Operation of a synthane gasifier pilot plant is discussed. The specific problems experienced with the operation of the Petrocarb system at the pilot plant are described along with modifications made to improve its performance.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 65-72
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  • 32
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    Coal extrusion in the plastic state (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Continuous feeding of coal in a compressing screw extruder is described as a method of introducing coal into pressurized systems. The method utilizes the property of many bituminous coals of softening at temperatures from 350 to 425 C. Coal is then fed, much in the manner of common thermoplastics, using screw extruders. Data on the viscosity and extruder parameters for extrusion of Illinois No. 6 coal are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: Proc. of the Conf. on Coal Feeding Systems; p 451-465
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  • 33
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    Continuous high pressure lump coal feeder design study (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A continuous lump coal dry feeder was developed for a pressurized fluidized bed combustor. The approach was to adapt the commercially available Fuller-Kinyon pump to feed coal against a pressure differential of 100 psi or more. The pump was modified and tests performed at various pressure differentials, with differently pitched screws, various screw rotational speeds, and various seal lengths and configurations. Successful operation of the modified Fuller-Kinyon pump was generally limited to pressure differentials of 60 psi or less. Although the results are not conclusive, test data and observations were made that indicated that higher pressure differentials could be attained by further modifications of the test setup. In particular, it is recommended that further testing be performed after replacing the 40-horsepower pump motor presently in the test setup with a motor having a significantly high power rating (thereby allowing pump operation with longer seals and at higher pressure differentials than those tested so far).
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 359-387
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    Development of dry coal feeders (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Design and fabrication of equipment of feed coal into pressurized environments were investigated. Concepts were selected based on feeder system performance and economic projections. These systems include: two approaches using rotating components, a gas or steam driven ejector, and a modified standpipe feeder concept. Results of development testing of critical components, design procedures, and performance prediction techniques are reviewed.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems,; p 195-239
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  • 35
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    Coal gasification: New challenge for the Beaumont rotary feeder (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The use of rotary feeders in the coal gasification process is described with emphasis on the efficient conversion of coal to clean gaseous fuels. Commercial applications of the rotary feeder system are summarized.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 73-99
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  • 36
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    Experience in feeding coal into a liquefaction process development unit (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A system for preparing coal slurry and feeding it into a high pressure liquefaction plant is described. The system was developed to provide supporting research and development for the Bureau of Mines coal liquefaction pilot plant. Operating experiences are included.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 41-54
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  • 37
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    Pressurized feeding on the GEGAS system (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A continuous process to feed coal directly into a pressurized gasifier is described. Coal fines are heated and mixed with a recycled tar binder and extruded through a novel die system against gasifier pressure. Performance data on a 2 in. system is given and scale up to a larger 6 in. system is described.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 411-450
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  • 38
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    Development of coal-feeding systems at the Morgantown Energy Research Center (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Systems for feeding crushed and pulverized coal into coal conversion reactor vessels are described. Pneumatic methods for feeding pulverized coal, slurry feeders, and coal pumps, methods for steam pickup, and a method for drying a water-coal slurry in a steam fluidized bed subsequent to feeding the coal into a reactor vessel are included.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 101-133
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  • 39
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    The Petrocarb pneumatic feeding system: A proven method for feeding particulate solids at controlled rates (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An outline of the principal features of the Petrocarb Pneumatic Feeding System is given. Early development and various commercial applications are included. It is concluded that the Petrocarb Injection System is capable of feeding dry solids into most of the processes being developed for utilizing coal.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 55-63
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  • 40
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    Real time computer controlled weld skate (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A real time, adaptive control, automatic welding system was developed. This system utilizes the general case geometrical relationships between a weldment and a weld skate to precisely maintain constant weld speed and torch angle along a contoured workplace. The system is compatible with the gas tungsten arc weld process or can be adapted to other weld processes. Heli-arc cutting and machine tool routing operations are possible applications.
    Keywords: MECHANICAL ENGINEERING
    Type: Proc. of the ASPE(MSFC Symp. on Eng. and Productivity Gains from Space Technol.; p 159-164
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  • 41
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    The MJS-77 magnetometer actuator (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A two-position (0 deg and 180 deg) actuating mechanism (flipper) driven by alternately-heated wax motors (pellets) will be used to rotate the low field triaxial fluxgate magnetometer experiment on the 1977 Mariner Jupiter-Saturn spacecraft to its 0 deg and 180 deg positions. The magnetic field, power requirements, weight and volume of this device are very restrictive. The problems encountered in design and development of this mechanism are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 77-86
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  • 42
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    An application of interactive computer graphics technology to the design of dispersal mechanisms (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Interactive computer graphics technology is combined with a general purpose mechanisms computer code to study the operational behavior of three guided bomb dispersal mechanism designs. These studies illustrate the use of computer graphics techniques to discover operational anomalies, to assess the effectiveness of design improvements, to reduce the time and cost of the modeling effort, and to provide the mechanism designer with a visual understanding of the physical operation of such systems.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 57-66
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  • 43
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    Two-dimensional oscillating airfoil test apparatus (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A two dimensional oscillating airfoil test apparatus is presented as a method of measuring unsteady aerodynamic forces on an airfoil or rotor blade section. The oscillating airfoil test rig, which is being built for use in an 11 X 11-foot transonic wind tunnel (speed range M = 0.4 - 1.4), will allow determination of unsteady loadings and detailed pressure distributions on representative airfoil sections undergoing simulated pitching and flapping motions. The design details of the motion generating system and supporting structure are presented. This apparatus is now in the construction phase.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 177-184
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  • 44
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    An active nutation damper for spacecraft (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An active nutation damping device, consisting of an angular accelerometer, a dc-motor-driven flywheel, and associated electronics, was developed for spacecraft use. This damping system was used on the LAGEOS spacecraft, launched May 4, 1976, to control nutation buildup during the long coast period (approximately 75 minutes) after the third stage separation. Of the many electrical and mechanical design choices involved, the use of an angular rather than linear accelerometer offers some advantages. There are some problems of adapting the angular accelerometer to spacecraft use. The damper package was evaluated and proven on a three-axis gas-bearing simulator that duplicated the LAGEOS spacecraft critical flight dynamics. A failure analysis of the damper assembly was performed.
    Keywords: MECHANICAL ENGINEERING
    Type: The 11th Aerospace Mech. Symp.; p 139-152
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  • 45
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    Torque-while-turnaround scan mirror assembly (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Mechanical aspects in the development of an oscillating scan mirror mechanism were reviewed, that featured a remarkably low level of structural vibration for the impact energies involved in mirror oscillation. Another feature was that energy lost during impact was returned to the mirror by applying torque only during the instant of impact. Because the duration of impact was only about 0.010 second, it was critical that energy losses be minimal because there was not much time to restore them.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 117-126
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  • 46
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    TRIDENT 1 third stage motor separation system (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The third stage engine separation system has shown through test and analysis that it can effectively and reliably perform its function. The weight of the hardware associated with this system is well within the targeted value.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 97-105
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  • 47
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    Magnetic bearing momentum wheels with magnetic gimballing capability for 3-axis active attitude control and energy storage (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Magnetic bearings used for the suspension of momentum wheels provide conclusive advantages: the low friction torques and the absence of abrasion allow the realization of lightweight high speed wheels with high angular momentum and energy storage capacity and virtually unlimited lifetime. The use of actively controlled bearings provides a magnetic gimballing capability by applying the external signals to the two servo loops controlling the rotational degrees of freedom. Thus, an attitude control system can be realized by using only one rotating mass for 3-axis active satellite stabilization.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 45-55
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  • 48
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    Design and Development of the Space Shuttle Tail Service Masts (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The successful launch of a space shuttle vehicle depends on the proper operation of two tail service masts (TSMs). Reliable TSM operation is assured through a comprehensive design, development, and testing program. The results of the concept verification test (CVT) and the resulting impact on prototype TSM design are presented. The design criteria are outlined, and the proposed prototype TSM tests are described.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 1-12
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  • 49
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    Development of a satellite flywheel family operating on one active axis magnetic bearings (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Since the samarium-cobalt magnets were available at industrial level, new possibilities appeared in the area of magnetic bearings with the radial passive centering and axial control of the rotor position. Magnetic bearings of this type on which a wide effort was made towards the optimization for satellite flywheel applications are described. Also, the momentum and reaction wheels were considered. This work was extended to the kinetic storage of energy for satellites.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 185-201
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  • 50
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    The conception, birth, and growth of a missile umbilical system (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The design development was traced for the sprint 2 and improved sprint 2 missile system (ISMS) umbilical system. The unique system requirements, umbilical designs considered to meet the requirements, and the problems encountered and solutions derived during the design, and development testing of the selected systems are described. The sprint 2 development effort consisted of design, analysis, and testing activities. The ISMS effort involved the performance of an extensive trade study to determine the optimum design to meet the ISMS conditions.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 203-212
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  • 51
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    GEOS-20 m cable boom mechanism (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The GEOS cable boom mechanism allows the controlled deployment of a 20 m long cable in a centrifugal force field. In launch configuration the flat cable is reeled on a 240 mm diameter drum. The electrical connection between the rotating drum and the stationary housing is accomplished via a flexlead positioned inside the drum. Active motion control of this drum is achieved by a self locking worm gear, driven by a stepper motor. The deployment length of the cable is monitored by an optical length indicator, sensing black bars engraved on the cable surface.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 153-162
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  • 52
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    Wear-resistant ball bearings for space applications (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Ball bearings for hostile environments were developed. They consist of normal ball bearing steel parts of which the rings are coated with hard, wear-resistant, chemical vapor deposited (C.V.D) TiC. Experiments in ultrahigh vacuum, using cages of various materials with self-lubricating properties, have shown that such bearings are suitable for space applications.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 127-137
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  • 53
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    Cartridge firing device designed for attachment, release and ejection of a satellite (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The device functions were performed by a one-piece unit with resulting performances which were of interest regarding the satellite attachment and the accuracies of the path and velocity during separation and ejection. A gain in weight may be obtained relative to the conventional device used, i.e. maintenance belt, belt unlocking device, pusher spring, and cartridge fired pusher.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 11th Aerospace Mech. Symp.; p 67-76
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  • 54
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    Electrophoretic fractional elution apparatus employing a rotational seal fraction collector (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Electrophoretic fractional elution apparatus which has a column with a rotating seal joint is described. A thin jet of eluting buffer is directed across the lumen of the electrophoretic column in a direction perpendicular to that of electrophoretic migration. Either the content of the column is rotated with respect to the stationary jet, or the jet is rotated with respect to the column. The system may employ electrophoresis either in free solution or in packed columns.
    Keywords: MECHANICAL ENGINEERING
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  • 55
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    Feasibility study of negative lift circumferential type seal for helicopter transmissions (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A new seal concept, the negative lift circumferential type seal, was evaluated under simulated helicopter transmission conditions. The bore of the circumferential seal contains step type geometry which produces a negative lift that urges the sealing segments towards the shaft surface. The seal size was a 2.5 inch bore and the test speeds were 7000 and 14,250 rpm. During the 300 hour test at typical transmission seal pressure (to 2 psig) the leakage was within acceptable limits and generally less than 0.1 cc/hour during the last 150 hours of testing. The wear to the carbon segments during the 300 hours was negligible.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-135302
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  • 56
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    Variable cycle gas turbine engines (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A technique, method, and apparatus were designed for varying the bypass ratio and modulating the flow of a gas turbine engine in order to achieve improved mixed mission performance. Embodiments include gas flow control system for management of core and bypass stream pressure comprising diverter valve means downstream of the core engine to selectively mix or separate the core and bypass exhaust streams. The flow control system may also include variable geometry means for maintaining the engine inlet airflow at a matched design level at all flight velocities. Earth preferred embodiment thus may be converted from a high specific thrust mixed flow cycle at supersonic velocities to a lower specific thrust separated flow turbofan system at subsonic velocities with a high degree of flow variability in each mode of operation.
    Keywords: MECHANICAL ENGINEERING
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  • 57
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    Motion restraining device (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A motion-restraining device for dissipating at a controlled rate the force of a moving body is discussed. The device is characterized by a drive shaft adapted to be driven in rotation by a moving body connected to a tape wound about a reel mounted on the drive shaft, and an elongated pitman link having one end pivotally connected to the crankshaft and the opposite end thereof connected with the mass through an energy dissipating linkage. A shuttle is disposed within a slot and guided by rectilinear motion between a pair of spaced impact surfaces. Reaction forces applied at impact of the shuttle with the impact surfaces include oppositely projected force components angularly related to the direction of the applied impact forces.
    Keywords: MECHANICAL ENGINEERING
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  • 58
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    Design study of the deepsky ultraviolet survey telescope (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Preliminary mechanical design and specifications are presented for a wide field ultraviolet telescope and detector to be carried as a Spacelab payload. Topics discussed include support structure stiffness (torsional and bending), mirror assembly, thermal control, optical alignment, attachment to the instrument pointing pallet, control and display, power requirements, acceptance and qualification test plans, cost analysis and scheduling. Drawings are included.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-151564 , SPO-59170-REV-A
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  • 59
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    Method of forming metal hydride films (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The substrate to be coated (which may be of metal, glass or the like) is cleaned, both chemically and by off-sputtering in a vacuum chamber. In an ultra-high vacuum system, vapor deposition by a sublimator or vaporizer coats a cooled shroud disposed around the substrate with a thin film of hydride forming metal which getters any contaminant gas molecules. A shutter is then opened to allow hydride forming metal to be deposited as a film or coating on the substrate. After the hydride forming metal coating is formed, deuterium or other hydrogen isotopes are bled into the vacuum system and diffused into the metal film or coating to form a hydride of metal film. Higher substrate temperatures and pressures may be used if various parameters are appropriately adjusted.
    Keywords: MECHANICAL ENGINEERING
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  • 60
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    Dry coal feeder development program at Ingersoll-Rand Research, Incorporated (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A dry coal screw feeder for feeding coal into coal gasification reactors operating at pressures up to 1500 psig is described. Results on the feeder under several different modes of operation are presented. In addition, three piston feeder concepts and their technical and economical merits are discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL Proc. of the Conf. on Coal Feeding Systems; p 240-284
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  • 61
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    Evaluation of coal feed systems being developed by the Energy Research and Development administration (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Development criteria and recommendations for coal feed system selections that include supporting data are presented. Considered are the areas of coal feed coasts, coal feed system reliability, and the interaction of the feed system with the conversion process.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-155267 , JPL-PUB-77-54
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  • 62
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    Hybrid propulsion system with a gyro component for economic and dynamic operation (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design of a hybrid drive with gyro components is described and its drive components for a medium class private car are discussed. The gyro component affects the short-period output of the drive by accelerating and slowing down and -- because of the mechanical transfer of kinetic energy between the gyro and the vehicle -- it affects also the energy balance in the case of intermittent operation. Energy can be taken in as desired either in the form of fuel or as fuel and current. A high energy recovery efficiency as well as the favorable operating range of the interval combustion engine makes it possible to reduce the fuel consumption per unit distance travelled to almost half that for a private car with a traditional engine.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-75188
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  • 63
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    Lightweight, low compression aircraft diesel engine (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of converting a spark ignition aircraft engine to the diesel cycle was investigated. Procedures necessary for converting a single cylinder GTS10-520 are described as well as a single cylinder diesel engine test program. The modification of the engine for the hot port cooling concept is discussed. A digital computer graphics simulation of a twin engine aircraft incorporating the diesel engine and Hot Fort concept is presented showing some potential gains in aircraft performance. Sample results of the computer program used in the simulation are included.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-135300
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  • 64
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    Oil cooling system for a gas turbine engine (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A gas turbine engine fuel delivery and control system is provided with means to recirculate all fuel in excess of fuel control requirements back to aircraft fuel tank, thereby increasing the fuel pump heat sink and decreasing the pump temperature rise without the addition of valving other than that normally employed. A fuel/oil heat exchanger and associated circuitry is provided to maintain the hot engine oil in heat exchange relationship with the cool engine fuel. Where anti-icing of the fuel filter is required, means are provided to maintain the fuel temperature entering the filter at or above a minimum level to prevent freezing thereof. Fluid circuitry is provided to route hot engine oil through a plurality of heat exchangers disposed within the system to provide for selective cooling of the oil.
    Keywords: MECHANICAL ENGINEERING
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  • 65
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    Radial forces in a misaligned radial face seal (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Radial forces on the primary seal ring of a flat misaligned seal are analyzed, taking into account the radial variation in seal clearance. An analytical solution for both hydrostatic and hydrodynamic effects is presented that covers the whole range from zero to full angular misalignment. The net radial force on the primary seal ring is always directed so as to produce a radial eccentricity which generates inward pumping. Although the radial force is usually very small, in some cases it may be one of the reasons for excessive leakage through both the primary and secondary seals of a radial face seal.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-135243 , TME-312
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  • 66
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    Stationary diesel engines for use with generators to supply electric power (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The procurement of stationary diesel engines for on-site generation of electric power deals with technical criteria and policy relating to federal agency, not electrical components of diesel-generator sets or for the design of electric-power generating plants or their air-pollution or noise control equipment.
    Keywords: MECHANICAL ENGINEERING
    Type: PB-280112/4 , TR-69 , NASA-CR-157616
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  • 67
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    Tissue stimulator enclosure welding fixture (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: It was demonstrated that the thickness of the stimulator titanium enclosure is directly related to the battery recharge time cycle. Reduction of the titanium enclosure thickness from approximately 0.37 mm (0.015 inch) to 0.05 mm (0.002 inch) significantly reduced the recharge time cycle and thereby patient inconvenience. However, fabrication of titanium enclosures from the thinner material introduced problems in forming, holding, and welding that required improvement in state of the art shop practices. The procedures that were utilized to resolve these fabrication problems are described.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-79529
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    Development and evaluation of die materials for use in the growth of silicon ribbons by the inverted ribbon growth process, task 2, LSSA project (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Silicon sessile drop experiments were performed on a variety of commercially available refractory carbides, nitrides, oxides, and borides to examine the potential of these materials for applications involving either direct contact with molten silicon or as substrates for CVD coatings in the fabrication of dies and crucibles for containing molten silicon. Simultaneous experiments were also conducted with CVD layers of SiC, Si3N4, and SiOxNy. Silicon nitride layers, deposited with NH3:SiH4 ratios ranging from 100:1 down to 5:1, were examined in sessile drop experiments to determine if the layers are degraded as a result of using lower reagent ratios. Preliminary experiments were undertaken on the stability of CVD Si3N4 near the melting point of silicon. Silicon ribbon segments were grown from vitreous carbon dies which had been coated with CVD Si3N4. Depending upon the purity of the die materials, ribbon resistivity values up to 40 Omega cm were obtained.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-157096 , QR-1 , PRRL-77-CR-53 , ERDA/JPL-954901-77/1
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  • 69
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    Stability of numerical integration techniques for transient rotor dynamics (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A finite element model of a rotor bearing system was analyzed to determine the stability limits of the forward, backward, and centered Euler; Runge-Kutta; Milne; and Adams numerical integration techniques. The analysis concludes that the highest frequency mode determines the maximum time step for a stable solution. Thus, the number of mass elements should be minimized. Increasing the damping can sometimes cause numerical instability. For a uniform shaft, with 10 mass elements, operating at approximately the first critical speed, the maximum time step for the Runge-Kutta, Milne, and Adams methods is that which corresponds to approximately 1 degree of shaft movement. This is independent of rotor dimensions.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-1092 , E-9252
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  • 70
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    Impact absorbing blade mounts for variable pitch blades (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A variable pitch blade and blade mount are reported that are suitable for propellers, fans and the like and which have improved impact resistance. Composite fan blades and blade mounting arrangements permit the blades to pivot relative to a turbine hub about an axis generally parallel to the centerline of the engine upon impact of a large foreign object, such as a bird. Centrifugal force recovery becomes the principal energy absorbing mechanism and a blade having improved impact strength is obtained.
    Keywords: MECHANICAL ENGINEERING
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  • 71
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    Finite-element computer program for axisymmetric loading situations where components may have a relative interference fit (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A finite element computer program which enables the analysis of distortions and stresses occurring in compounds having a relative interference is presented. The program is limited to situations in which the loading is axisymmetric. Loads arising from the interference fit(s) and external, inertial, and thermal loadings are accommodated. The components comprise several different homogeneous isotropic materials whose properties may be a function of temperature. An example illustrating the data input and program output is given.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TN-D-8483 , E-9018
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  • 72
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    Combined docking and grasping device (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A combined docking and grasping device for use with a manipulator arm on a docking vehicle and the like for mechanically connecting a docking vehicle with an orbital payload having a receptacle for receiving the device is described. The device includes a pair of opposing jaw members having opposing serrated surfaces for grasping an object and a triangular cam portion on an outer surface for insertion and interlocking with an orbital payload.
    Keywords: MECHANICAL ENGINEERING
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  • 73
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    Elastohydrodynamic lubrication of elliptical contacts for materials of low elastic modulus. 1: Fully flooded conjunction (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Elastohydrodynamic lubrication concepts of conjunctions of elliptical form are applied to materials of low elastic modulus. The influence of the ellipticity parameter and the dimensionless speed, load, and material parameters on minimum film thickness for these materials has been investigated. The ellipticity parameter was varied from a ball on plate configuration to a configuration approaching a line contact. The dimensionless speed and load parameters were varied by 1 order of magnitude. Seventeen different cases were used to generate minimum and central film thickness relations. Contour plots are presented that illustrate the pressure distribution and film thickness in the conjunction.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TN-D-8528 , E-9216
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  • 74
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    Status of the Electroforming Shield Design (ESD) project (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The utilization of a digital computer to augment electrodeposition/electroforming processes in which nonconducting shielding controls local cathodic current distribution is reported. The primary underlying philosophy of the physics of electrodeposition was presented. The technical approach taken to analytically simulate electrolytic tank variables was also included. A FORTRAN computer program has been developed and implemented. The program utilized finite element techniques and electrostatic theory to simulate electropotential fields and ionic transport.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-150349
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  • 75
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    Durability testing at one atmosphere of advanced catalysts and catalyst supports for automotive gas turbine engine combustors, part 1 (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The durability of catalysts and catalyst supports in a combustion environment was experimentally demonstrated. A test of 1000 hours duration was completed with two catalysts, using diesel fuel and operating at catalytically supported thermal combustion conditions. The performance of the catalysts was determined by monitoring emissions throughout the test, and by examining the physical condition of the catalyst core at the conclusion of the test. The test catalysts proved to be capable of low emissions operation after 1000 hours diesel aging, with no apparent physical degradation of the catalyst support.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-135132 , CONS-9416-1
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  • 76
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    Pressure modulating valve (1977)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: A modulating valve device, operated by fluid pressure in fluid motors to control work pressure, is described.
    Keywords: MECHANICAL ENGINEERING
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  • 77
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    Design charts for arbitrarily pivoted, liquid-lubricated flat-sector-pad thrust bearing (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A flat, sector-shaped geometry for a liquid-lubricated thrust bearing is analyzed considering both the pitch and roll of the pad. Results are presented in design charts that enable a direct approach to the design of point- and line-pivoted, tilting pad bearings. A comparison is made with the Mitchell bearing approximation and it is found that this approximation always overestimates load capacity.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TN-D-8344 , E-8899
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  • 78
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    Thermal stress analysis of a graded zirconia/metal gas path seal system for aircraft gas turbine engines (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A ceramic/metallic aircraft gas turbine outer gas path seal designed to enable improved engine performance is studied. Flexible numerical analysis schemes suitable for the determination of transient temperature profiles and thermal stress distributions in the seal are outlined. An estimation of the stresses to which a test seal is subjected during simulated engine deceleration from sea level takeoff to idle conditions is made. Experimental evidence has indicated that the surface layer of the seal is probably subjected to excessive tensile stresses during cyclic temperature loading. This assertion is supported by the analytical results presented. Brief consideration is given to means of mitigating this adverse stressing.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-73658 , E-9164
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  • 79
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    A fundamental approach to adhesion: Synthesis, surface analysis, thermodynamics and mechanics (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of composites as adherends was studied. Several other variables were studied by fractography: aluminum powder adhesive filler, fiber glass cloth scrim or adhesive carrier, new adhesives PPQ-413 and LARC-13, and strength-test temperature. When the new results were juxtaposed with previous work, it appeared that complex interactions between adhesive, adherend, bonding, and testing conditions govern the observed strength and fracture-surface features. The design parameters likely to have a significant effect upon strength-test results are listed.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-152672
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  • 80
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    Performance of large-bore tapered-roller bearings under combined radial and thrust load at shaft speeds to 15,000 rpm (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The performance of 120.65-mm bore tapered roller bearings was investigated at shaft speeds up to 15,000 rpm. Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rate, and lubricant inlet temperature. Lubricant was supplied by either jets or by a combination of holes through the cone directly to the cone-rib contact and jets at the roller small-end side. Cone-rib lubrication significantly improved high-speed tapered-roller bearing performance, yielding lower cone-face temperatures and lower power loss and allowing lower lubricant flow rates for a given speed condition. Bearing temperatures increased with increased shaft speed and decreased with increased lubricant flow rate. Bearing power loss increased with increased shaft speed and increased lubricant flow rate.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TN-D-8404 , E-8825
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  • 81
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    Experimental evaluation of fuel preparation systems for an automotive gas turbine catalytic combustor (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Premixing-prevaporizing fuel systems were evaluated for use with a catalytic reactor for possible automotive gas turbine application. Spatial fuel-air distributions, degree of vaporization, pressure drop and air velocity profiles were measured. Three airblast injectors and an air-assist nozzle were tested. Air swirlers were used to improve the spatial fuel-air distribution. The work was done in a 12 cm tubular duct. Test conditions were: a pressure of 0.3 and 0.5 MPa, inlet air temperatures up to 800 K, air velocities of 10 and 20 m/s and fuel-air ratios up to 0.020. The fuel was Jet A. The best results were obtained with an air-blast configuration that used multiple cones to provide high velocity air for atomization and also straightened the inlet airflow. With this configuration, uniform spatial fuel-air distributions were obtained with mixing lengths greater than 17.8 cm. In this length, vaporization of the fuel was 98.5 percent complete at an inlet air temperature of 700 K. The total pressure loss was 1.0 percent with a reference velocity of 20 m/s and 0.25 percent at 10 m/s. The air velocity was uniform across the duct and no autoignition reactions were observed.
    Keywords: MECHANICAL ENGINEERING
    Type: Workshop on Catalytic Combustion; Jun 21, 1977 - Jun 22, 1977; Raleigh, NC
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  • 82
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    Design considerations in mechanical face seals for improved performance. II - Lubrication (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The importance of sealing technology in the U.S. industrial chemical-orientated society in regard to maintenance and environmental contamination is pointed out. It is stated that seal performance (leakage, life) is directly related to seal lubrication, which is a mechanism not well understood. Current thinking in regard to seal lubrication is reviewed, the effect of energy dissipation in the thin lubricating film separating the sealing faces is pointed out, and the results of vaporization due to heating are illustrated. Also, hydrodynamic lubrication is reviewed, and an inherent tendency for the seal to operate with angular misalignment is pointed out. Recent work on hydrostatic effects is summarized and the conditions for seal instability are discussed. Four different modes of seal lubrication are postulated with the mode type being a strong function of speed and pressure.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-WA/LUB-4 , American Society of Mechanical Engineers, Winter Annual Meeting; Nov 27, 1977 - Dec 02, 1977; Atlanta, GA
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  • 83
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    Design considerations in mechanical face seals for improved performance. I - Basic configurations (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Basic assembly configurations of the mechanical face seal are described and some advantages associated with each are listed. The various forms of seal components (the primary seal, secondary seal, etc.) are illustrated, and functions pointed out. The technique of seal pressure balancing and its application is described; and the concept of the PV factor, its different forms and limitations are discussed. Brief attention is given to seal lubrication since it is covered in detail in a companion paper. Finally, the operating conditions for various applications of low pressure seals (aircraft transmissions) are listed, and the seal failure mode of a particular application is discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-WA/LUB-3 , American Society of Mechanical Engineers, Winter Annual Meeting; Nov 27, 1977 - Dec 02, 1977; Atlanta, GA
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  • 84
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    Analytical investigation of thermal barrier coatings for advanced power generation combustion turbines (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An analytical evaluation was conducted to determine quantitatively the improvement potential in cycle efficiency and cost of electricity made possible by the introduction of thermal barrier coatings to power generation combustion turbine systems. The thermal barrier system, a metallic bond coat and yttria stabilized zirconia outer layer applied by plasma spray techniques, acts as a heat insulator to provide substantial metal temperature reductions below that of the exposed thermal barrier surface. The study results show the thermal barrier to be a potentially attractive means for improving performance and reducing cost of electricity for the simple, recuperated, and combined cycles evaluated.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-WA/ENER-13 , American Society of Mechanical Engineers, Winter Annual Meeting; Nov 27, 1977 - Dec 02, 1977; Atlanta, GA
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  • 85
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    Prediction of the bulk temperature in spur gears based on finite element temperature analysis (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The temperature distribution in spur gears operating in a state of thermal equilibrium is solved by using a finite element method. The effects of various dimensionless parameters on bulk temperature are shown. A table is provided which can be used to predict the bulk temperature on gear teeth, once the heat transfer coefficients and frictional heat input is estimated. Theoretical results for estimating heat transfer coefficients and frictional heat are also summarized.
    Keywords: MECHANICAL ENGINEERING
    Type: ASLE PREPRINT 77-LC-3B-2 , Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
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  • 86
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    Ferrographic analysis of wear debris generated in accelerated rolling element fatigue tests (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Ferrographic analysis was used to determine the types and quantities of wear particles generated during accelerated rolling contact fatigue tests. The NASA five-ball rolling contact fatigue tester was used. Ball specimens were made of AMS 5749, a corrosion-resistant high-temperature bearing steel. The lubricant was a super-refined naphthenic mineral oil. Conditions included a maximum Hertz stress of 5.52 billion Pa and a shaft speed of 10,000 rpm. Four types of wear particles were observed: normal rubbing wear particles, fatigue spall particles, spheres, and friction polymer.
    Keywords: MECHANICAL ENGINEERING
    Type: Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
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  • 87
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    Asperity interactions in EHD contacts (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Infrared temperature measurements, ferrographic analysis, and surface profilimetry were used to monitor asperity interactions in a sliding EHD point contact. The contact temperature and surface profile signals obtained both before and after a run-in period are compared in the frequency domain by means of a Fourier analyzer. The interaction of surface asperities is accompanied by the presence of a high frequency component in the infrared signal. It is also shown that only a relatively narrow band of wavelengths of the surface profile spectrum are relevant in the interaction process.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-LUB-19 , Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
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  • 88
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    Elastohydrodynamic lubrication of elliptical contacts for materials of low elastic modulus. I - Fully flooded conjunction (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A complete numerical solution is presented to the problem of isothermal elastohydrodynamic lubrication of elliptical contacts for low-elastic-modulus materials operating under fully loaded conditions. No assumption is made for the pressure or film thickness within the contact, and compressibility and viscous effects are taken into account. Because of the dimensionless representation of the coordinates, the actual Hertzian contact ellipse becomes a circle regardless of the value of the ellipticity parameter. A minimum-film-thickness relation and a central-film-thickness relation are derived from examining 17 different cases. Contour plots for detailed illustration of the pressure distribution and film thickness in the conjunction are provided.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-LUB-10 , Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
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  • 89
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    Glass transitions in lubricants - Its relation to elastohydrodynamic lubrication /EHD/ (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A preliminary investigation into the possible role of glass transition and glassy state behavior of lubricants in EHD contacts is reported. Measurements of the glass transition of lubricants as a function of pressure by two methods are presented along with a discussion indicating possible implications of the results to EHD lubrication.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-LUB-3 , Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
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  • 90
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    Light-scattering study of the glass transition in lubricants (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The sound velocity of four lubricants has been measured as a function of temperature and pressure using Brillouin scattering. A change in slope of the velocity as a function of temperature or pressure allowed the determination of the glass transition temperature and pressure. The glass transition data were used to construct a phase diagram for each lubricant. The data indicate that the glass transition temperature increased with pressure at a rate which ranged from 120 to 200 C/GPa. The maximum pressure attained was 0.69 GPa and the temperature range was from 25 to 100 C.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-LUB-15 , Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
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  • 91
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    The design of hydraulic pressure regulators that are stable without the use of sensing line restrictors or frictional dampers (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A direct-acting hydraulic pressure regulator design which incorporates stability margin, response and droop margin is developed. The pressure regulator system does not involve a nonlinear sensing line restrictor (which may degrade transient response) or linear damping (which is sensitive to clearance and viscosity). The direct-acting hydraulic pressure regulator makes use of the technique of lead network stabilization (i.e., the tuned stabilizer concept). An analytically derived circuit pressure regulator is tested to study the stability limit under a parallel capacitive plus resistive load and the stabilizing effect of the tuned stabilizer.
    Keywords: MECHANICAL ENGINEERING
    Type: National Conference on Fluid Power; Oct 25, 1977 - Oct 27, 1977; Chicago, IL
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  • 92
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    Effects of potassium titanate fiber on the wear of automotive brake linings (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Asbestos reinforcing fiber in an automotive friction material was replaced by an experimental ingredient having better thermal stability, and the effects on wear and friction were studied. A friction materials test machine (SAE J661a) was used to determine friction and wear, under constant energy output conditions, as a function of temperature between 121 and 343 C (250 and 650 F). When potassium titanate fiber replaced one half of the asbestos in a standard commercial lining, with a 40 percent upward adjustment of phenolic resin content, wear above 204 C (400 F) was improved by 40% and friction by 30%. Tests on a full-scale inertial dynamometer supported the findings of the sample dynamometer tests. It was demonstrated that the potassium titanate fiber contributes directly to the improvement in wear and friction.
    Keywords: MECHANICAL ENGINEERING
    Type: International Conference on Wear of materials; Apr 24, 1977 - Apr 28, 1977; St. Louis, MO
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  • 93
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    Influence of adsorbed fluids on the rolling contact deformation of MgO single crystals (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Basic phenomena associated with rolling contact deformation were studied using MgO as a model bearing material. A hardened steel ball was rolled on MgO single crystals in slow-speed reciprocating motion and in high-speed circular motion. The resulting deformation was studied by dislocation etch-pit techniques. The presence of adsorbed fluids, such as silicone oil, white mineral oil, and toluene, with slow-speed sliding caused a dramatic change in slip mode and premature surface spalling compared with similar experiments in air or under water. In contrast, dimethyl formamide inhibited these slip processes. The results are consistent with the dependence of dislocation mobility on adsorbed species. High-speed hydrodynamic rolling with mineral oil lubrication produced a different slip phenomena entirely from the slow-speed rolling. The slip bands resembled those produced in tensile tests, and all slip apparently initiated at subsurface sites.
    Keywords: MECHANICAL ENGINEERING
    Type: International Conference on Wear of materials; Apr 24, 1977 - Apr 28, 1977; St. Louis, MO
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  • 94
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    Wear studies on aircraft brake materials (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An investigation of both worn surfaces of friction pads and steel rotors which are being applied in current aircraft brakes has been carried out by employing an X-ray diffraction technique. It consists of the analysis of chemical element distribution in the surface layers. The wear particles were also examined by using the scanning electron microscope. The initiation and growth of surface cracks and the oxidation were emphasized in this investigation. A wear model was proposed for the current aircraft brake materials. Essentially this model proposed that cracks are formed in the surface layer of the brake material due to the normal and frictional stresses. It is primarily surface temperature dependent.
    Keywords: MECHANICAL ENGINEERING
    Type: International Conference on Wear of materials; Apr 24, 1977 - Apr 28, 1977; St. Louis, MO
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  • 95
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    The use of analytical surface tools in the fundamental study of wear (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper reviews the various techniques and surface tools available for the study of the atomic nature of the wear of materials. These include chemical etching, X-ray diffraction, electron diffraction, scanning electron microscopy, low-energy electron diffraction, Auger emission spectroscopy analysis, electron spectroscopy for chemical analysis, field ion microscopy, and the atom probe. Properties of the surface and wear surface regions which effect wear such as surface energy, crystal structure, crystallographic orientation, mode of dislocation behavior, and cohesive binding are discussed. A number of mechanisms involved in the generation of wear particles are identified with the aid of the aforementioned tools.
    Keywords: MECHANICAL ENGINEERING
    Type: International Conference on Wear of materials; Apr 24, 1977 - Apr 28, 1977; St. Louis, MO
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  • 96
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    Graphite/epoxy pressure vessels lined with ultra-thin titanium (1977)
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    Publication Date: 2019-07-13
    Description: Filament-wound, titanium-lined, fiber/epoxy pressure vessels were made using a very high-strength graphite fiber (3570-MPa typical fiber strength). The 0.254-mm-thick titanium liner was used to improve burst performance. The pressure vessels achieved an average burst performance of 241 kPa.cu m/kg, and the fatigue life of titanium liners with good welds (cycled to 50% of the average expected burst pressure) was in excess of 2000 cycles.
    Keywords: MECHANICAL ENGINEERING
    Type: National Symposium and Exhibition; Apr 26, 1977 - Apr 28, 1977; San Diego, CA
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  • 97
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    Assessment of present state-of-the-art sawing technology of large diameter ingots for solar sheet material (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objective of this program is to assess the present state-of-the-art sawing technology of large diameter silicon ingots (3 inch and 4 inch diameter) for solar sheet materials. During this period, work has progressed in three areas: (1) slicing of the ingots with the multiblade slurry saw and the I.D. saw, (2) characterization of the sliced wafers, and (3) analysis of direct labor, expendable material costs, and wafer productivity.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-157095 , DOE/JPL-954830-77/12 , QR-1
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  • 98
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    Development of spiral-groove self-acting face seals (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An experimental evaluation and a 100-hour endurance test were performed on a spiral groove geometry, self-acting face seal. The seal was tested and operated successfully at maximum conditions of 243.8 m/s surface speed, 199.9 N/sq cm air pressure, and 645.4K (702 F) air temperature. The maximum speed condition of 243.8 m/s was obtained at a shaft speed of 72,500 rpm. Seal wear, gas leakage, and sealing element temperature were monitored during the test. Condition of the seal at the completion of the test was documented and found acceptable for further use. The spiral groove wear rate measured during the endurance test indicates a minimum potential seal life of over 2700 hours. Seal air leakage measured during the test program is within the range considered acceptable for consideration for use in a small gas turbine engine.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-135303 , LYC-77-41
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 99
    facet.materialart.
    Unknown
    A pressurized gas squeeze film journal damper (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A lumped parameter model is developed to determine the stiffness and damping characteristics of inherently compensated gas film bearings. The model relies on the average static pressure over a one dimensional strip bearing. Results of the model are compared with known computer solutions for the distributed strip and a two dimensional square bearing. The results for the stiffness agree well with the computer solutions although the model proved to be inadequate for predicting the film damping.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-155533 , MSSU-EIRS-ME-78-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 100
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    Unknown
    Lubrication of high-speed, large bore tapered-roller bearings (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The performance of 120.65-mm- (4.75-in.-) bore tapered-roller bearings was investigated at shaft speeds up to 15,000 rpm (18,000 DN). Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rate, and lubricant inlet temperature. Lubricant was supplied either by jets or by a combination of holes through the cone directly to the cone-rib contact and jets at the roller small-end side. Cone-rib lubrication significantly improved high-speed tapered-roller bearing performance, yielding lower cone-face temperatures and lower power loss and allowing lower lubricant flow rates for a given speed condition. Bearing temperatures increased with increased shaft speed and decreased with increased lubricant flow rate. Bearing power loss increased with increased shaft speed and increased lubricant flow rate.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-73673 , E-8825 , Joint Lubrication Conf.; Oct 03, 1977 - Oct 05, 1977; Kansas City
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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