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  • 1
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    Transient dynamics of a flexible rotor with squeeze film dampers (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A series of simulated blade loss tests are reported on a test rotor designed to operate above its second bending critical speed. A series of analyses were performed which predicted the transient behavior of the test rig for each of the blade loss tests. The scope of the program included the investigation of transient rotor dynamics of a flexible rotor system, similar to modern flexible jet engine rotors, both with and without squeeze film dampers. The results substantiate the effectiveness of squeeze film dampers and document the ability of available analytical methods to predict their effectiveness and behavior.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-3050 , PWA-5548-9
    Format: application/pdf
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  • 2
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    Preliminary test results with a Stirling Laboratory Research Engine (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Jet Propulsion Laboratory has designed, assembled, and initiated testing of a Stirling Laboratory Research Engine (SLRE). This preprototype engine provides a research tool to support the development of a broad range of analytical modeling and experimental efforts. The SLRE is a horizontally opposed, two-piston, single-acting Stirling engine with a split crankshaft drive mechanism. The paper discusses the preliminary results obtained during engine motoring tests and compares these results with two different analytical prediction models. Comparisons are made between experiment, the classical Schmidt analysis, and the JPL Stirling Cycle Analysis Model (SCAM). SCAM is a computerized one-dimensional, cyclic, compressible flow model of the SLRE and consists of a compilation of individual component subroutines. The formulation and current state of development of the SCAM program is briefly described.
    Keywords: MECHANICAL ENGINEERING
    Type: Intersociety Energy Conversion Engineering Conference; Aug 05, 1979 - Aug 10, 1979; Boston, MA
    Format: text
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  • 3
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    Elasto-plastic impact of hemispherical shell impacting on hard rigid sphere (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An analysis of plastic stress waves for cylindrical metallic projectile in impact is extended to an analysis of a hemispherical shell suffereing plastic deformation during the process of impact. It is assumed that the hemispherical shell with a prescribed launch velocity impinges a fixed rigid sphere of diameter equal to the internal diameter of the shell. The dynamic biaxial state of stress present in the shell during deformation is investigated. The analysis is valuable for studying the state of stress during large plastic deformation of a hemispherical shell.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 2; p 563-573
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  • 4
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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
    Format: application/pdf
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  • 5
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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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  • 6
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    Experimental study of transient dynamics of a flexible rotor (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of an experimental program to investigate the transient response of a flexible rotor are presented. The program consisted of a series of tests conducted on a rig with a rotor designed to operate above its first bending critical speed. The purpose of the tests was to obtain experimental data on the transient behavior of a flexible rotor under conditions simulating those which might occur in a jet aircraft engine. The scope of the program included tests to measure the response of both balanced and unbalanced rotors during steady-state operation, acceleration, deceleration, and simulated blade loss.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-2703 , PWA-5333
    Format: application/pdf
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  • 7
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    Stator rotor tools (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An apparatus and method for removing and reinserting base member segments in an arcuate slot in an engine part are described. Each base member separately includes blades or stators, holding the engine part in place while manipulating fingers or an arm onto an interfitting abutting relationship with most of the blades. A torque force is applied to the base of the blades to move a base member relative to such an arcuate slot.
    Keywords: MECHANICAL ENGINEERING
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  • 8
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    Light-scattering study of the glass transition in lubricants (1977)
    In:  Other Sources
    Details
    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
    Format: text
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  • 9
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    A multilevel control system for the large space telescope (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A multilevel scheme was proposed for control of Large Space Telescope (LST) modeled by a three-axis-six-order nonlinear equation. Local controllers were used on the subsystem level to stabilize motions corresponding to the three axes. Global controllers were applied to reduce (and sometimes nullify) the interactions among the subsystems. A multilevel optimization method was developed whereby local quadratic optimizations were performed on the subsystem level, and global control was again used to reduce (nullify) the effect of interactions. The multilevel stabilization and optimization methods are presented as general tools for design and then used in the design of the LST Control System. The methods are entirely computerized, so that they can accommodate higher order LST models with both conceptual and numerical advantages over standard straightforward design techniques.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-143941
    Format: application/pdf
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  • 10
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    Dip coating process: Silicon sheet growth development for the large-area silicon sheet task of the low-cost silicon solar array project (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: To date, an experimental dip-coating facility was constructed. Using this facility, relatively thin (1 mm) mullite and alumina substrates were successfully dip-coated with 2.5 - 3.0 ohm-cm, p-type silicon with areas of approximately 20 sq cm. The thickness and grain size of these coatings are influenced by the temperature of the melt and the rate at which the substrate is pulled from the melt. One mullite substrate had dendrite-like crystallites of the order of 1 mm wide and 1 to 2 cm long. Their axes were aligned along the direction of pulling. A large variety of substrate materials were purchased or developed enabling the program to commence a substrate definition evaluation. Due to the insulating nature of the substrate, the bottom layer of the p-n junction may have to be made via the top surface. The feasibility of accomplishing this was demonstrated using single crystal wafers.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-146874 , QR-2
    Format: application/pdf
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