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  • 1
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    Nondestructive testing: Introduction (1973)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: A comparison of selected nondestructive evaluation methods is presented. The properties sensed, type of flaws detected, and application for each nondestructive test are shown.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 1-6
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  • 2
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    Eddy-current testing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: Eddy-current inspection is discussed as a method for locating subsurface flaws in electrically conductive materials. The physical principles and electrical circuitry are described along with the test equipment.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 101-117
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  • 3
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    Developmental methods (1973)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: Brief accounts are included of three nondestructive evaluation methods that have been introduced within the past few years: (1) acoustic emission, (2) the use of coherent (laser) light, and (3) ultrasonic holography.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 263-269
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  • 4
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    Leak testing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: Leak-testing methods for gas and liquid systems are described. The physical principles of molecular, liquid, and gas flow; relations of leak-testing methods and instrumentation; and tracer gases used in testing vacuum systems are discussed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 195-224
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  • 5
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    Strain sensing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: The three most generally used practical methods of strain sensing are discussed. These methods are brittle coatings, photoelastic coatings, and resistance strain gages. The physical principles of each method are reviewed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 225-261
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  • 6
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    Liquid penetrants (1973)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: Liquid-penetrant inspection is discussed for surface defects in solids. The principle advantages are considered to be its simplicity and economy. The techniques and penetrants are described along with the developers. Commercially available equipment is also described.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 7-26
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  • 7
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    Magnetic testing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: Magnetic techniques are described for the nondestructive evaluation of defects in materials. The physical principles, and the magnetic-particle method are discussed along with magnetic-hysteresis measurements and electric current perturbations.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 165-194
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  • 8
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    Thermal and infrared testing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2009-11-16
    Beschreibung: The detection of defective components in devices which are active heat sources, and the detection and characterization of flaws in structures that are thermally passive, but which can be nondestructively heated or cooled are described. The physical principles and thermal detectors and methods are discussed along with contact, and noncontact thermographic methods.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Nondestructive Testing; p 119-140
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  • 9
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    Studies of irregularities in motion of vibroshock type mechanisms (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Reciprocating motion mechanisms, in which a mass with large gaps can be driven with almost uniform speed, are investigated. A single-mass system with dry friction, the motion of which is restricted by two stops, is examined. The system is put into motion by kinematic disturbances through a flexible link. Periodic modes of movement, under conditions in which the disturbance arises from two impacts on the mass (from the right and left stops) are examined. Primary attention was given to irregularities in the course of the mass. The shock interaction of the mass with the stop was accounted for by the shock speed restoration coefficient R. The shock-frequency characteristics of the free shock vibrations were determined. Expressions were obtained which define the transitional process. The phase and velocity of several succeeding shocks were determined. After taking account of the conditions of the steady mode of movement, velocities and phases in the steady mode of movement were obtained.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 294-295
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  • 10
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    Synthesis of mechanisms with flexible centrifugal-inertial connections according to fixed dynamic characteristics (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: The criteria for the selection of dynamic characteristics of flexible centrifugal-inertial couplings are discussed. The basic properties considered are: (1) vibration isolation, (2) vibration quenching, and (3) transmission properties. It is stated that the most promising couplings are those with a nonlinear relation between the magnitude of the torque transmitted and the magnitude of deformation of the coupling. The efforts of various investigators are briefly analyzed. Mathematical models are developed to show the relationships of the parameters involved.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 264-268
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  • 11
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    Synthesis of vibration systems, having group symmetry or quasi-symmetry, according to the frequency spectrum (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Torsional vibration systems, with finite numbers of degrees of freedom are investigated. In designing such systems, it is important to select parameters, so that the frequency spectrum of the natural vibrations is beyond the limits of the resonance danger region. In the case when the system has a large number of degrees of freedom, calculation of its natural frequencies, as well as tuning out the resonance danger zones is laborious. When the system being investigated has one group symmetry or another, solution of the problem mentioned above is facilitated, as a consequence of breaking down the frequency equations into several, which are smaller in size. An algorithm is given for tuning out the natural frequency spectrum from the forbidden region, by means of varying the rigidity of systems having group symmetries or group quasi-symmetries.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 269-270
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  • 12
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    Method of investigation of vibroacoustic characteristics of centrifugal pumps (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: A method for acoustical diagnostics of pumps is described which consists of taking sonograms of the pump, by means of an audio spectrograph. In distinction from usual analyzers, the spectrograph makes it possible to obtain a three-dimensional image of the signal being analyzed, in which its frequency-amplitude characteristics developed over time are depicted with a resolving power of 0.004 sec. As an example, a sonogram of an electrically driven pump, in the 40-4000 Hz frequency range, is presented. The amplitude ratios are determined on the sonogram by the contrast of individual contours, with an accuracy of 6 db.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 195-196
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  • 13
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    Method of study of the possibility of predicting the quality of treatment in polishing by vibroacoustical processes (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: The quality of vibroacoustical surface polishing and the deviation formation process of the surfaces were studied using a polishing mill unit. Data cover spectral composition of vibration accelerations and vibration displacements of individual elements, precision rotation of the polishing circle spindle in static and dynamic operation modes, spectral composition of relative vibrations of polishing circle and the part being processed, statistical and dynamic rigidity of individual elements, and APFC of the elastic system of the mill stand. The effect of individual spindle parameters on vibroacoustical characteristics of the system was also discussed as well as the spectrum measurement of the disturbing force.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 169-170
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  • 14
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    Digital modeling of vibroacoustical processes generated by gearing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: The statistical nature of vibroacoustical processes in transmission gears was studied using mathematical models. Special attention was given to high frequency components of vibroacoustical processes generated by spur gearing. Equations are given for describing torsional and tranverse vibrations of pairs of gear wheels when meshing, taking into account the flexibility of their supports.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 163-165
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  • 15
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    Diagnostic device for monitoring the technical condition of mechanical assemblies (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: An automatic diagnostic device for monitoring the condition of tractor transmission gears is described. The structural noise spectrum of the gearshift box and rear axle of the tractor were analyzed in a digital computer, by an algorithm based on the multiple correlation method. The optimum assembly of operating frequencies, by use of which the errors in measurement were minimized, was selected from the entire frequency spectrum. Selected frequencies are necessary for choosing the measurement range of the diagnostic device. It turned out that, to obtain a relative error of no more than 2%, it was sufficient to use two filters, vibrating only at the frequencies carrying the maximum data of the mechanical parameter being investigated. The measurement system consists of frequency-selection filters, amplifiers and quadratic detectors, at the outlets of which constant voltages are created, which are proportional to the signal level at the frequencies selected.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 241-242
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  • 16
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    Problems of vibroacoustical diagnostics of textile machines (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: The application of a vibroacoustical method for analyzing the vibration characteristics of textile machines is discussed. A drawing of a typical mechanism is provided to show the sources of vibration. The conditions under which the machine operates are defined. An accelerometer is used as a sensor. The point of installation is selected so that a dip in the frequency characteristic of the vibrating part, on which the sensor is installed, in the region of the maximum acoustical signal. This allows for a drop in the vibrations for those values of the gap in the mechanism which amount to 10 to 20 db.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 239-240
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  • 17
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    Synthesis of vibration dampers (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: A method which uses a mathematical accelerometer is proposed for determining the 3rd derivative of the displacement in shock absorbers.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 209-211
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  • 18
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    The use of statistical characteristics of reducer vibrations as diagnostic symptoms (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: The results of a statistical analysis of the vibrations of the experimental RS-1 reducer stand, with a spiral-gear transmission, operating on a closed circuit, are presented. The analysis was carried out on the Minsk-2 and Minsk-32 digital computers, with two-channel analog-digital converter, built in the Institute of the Science of Mechanics. Two-dimensional distribution patterns, conditional dispersions and dispersion ratios were calculated. The octave-band-filtered first harmonics of the tooth frequency f sub z of the vibrations at two different measurement points were considered as the components of the vibration process to be analyzed. The regression lines, corresponding to different values of the loading torque, are presented. Since it was not the gear drive parameters which were determined by diagnostic methods, but the characteristics most sensitive to change in state of the object of the investigation, the loading torque, which is the simplest and most accessible for measurement, was chosen as the condition parameter.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 150-153
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  • 19
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    Investigation of noise in gear transmissions by the method of mathematical smoothing of experiments (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: A rotatable central component smoothing method is used to analyze rotating gear noise spectra. A matrix is formulated in which the randomized rows correspond to various tests and the columns to factor values. Canonical analysis of the obtained regression equation permits the calculation of optimal speed and load at a previous assigned noise level.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 115-117
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  • 20
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    Determination of changes in properties of random processes with an accuracy assigned in advance (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: A probability model of random processes is used to calculate the probability characteristics which exist in the random problem of vibroacoustic processes in machine operations.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 119-122
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  • 21
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    Diagnostics of the technical condition of antifriction bearings (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Shock pulse measurements that express the characteristic curves of rotational bearing resistance are used to diagnose possible deficiencies. Spectral analysis of frequency vibration tracings establishes probable causes for various anomalies in the geometric shape, surface frequency, contamination, etc.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 91-99
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  • 22
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    Diagnostics of sources of disturbances and distribution of vibrations over the width of a tape in tape-feed mechanisms (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Disturbances created by certain assemblies and components of tape-feed mechanisms (TFM) and acting on a moving magnetic tape are studied. The method, based on elements of digital logic, is established by stress-strain diagrams of the longitudinal deformations and vibrations across the width of a magnetic tape. Experimental studies were carried out for determination of the functional relationships of longitudinal deformations in a section of magnetic tape to the magnitude of roller play, tension vibrations rate of movement, and elasticity of magnetic tapes. A block diagram of the measurements is shown. Appropriate digital computer algorithms and programs were proposed for statistical analysis of the data obtained. Estimates of the mathematical expectation, dispersion, intercorrelation function, energy spectral density, and distribution pattern of the random process values were calculated.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 87-88
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  • 23
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    Measurement of vibration rate of manually operated percussion machines (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: A special apparatus for measurement of accelerations of between 1 and 5000 g and shock stress pulses from 20 kg/cu cm up, with durations of 50.1 million sec and higher was designed and built. The amplitudes and shapes of the peak vibroshock pulses, arising during operation of a hammer, are obtained; the recording time of the continuous process is determined by the time of one revolution of the drum of a specially made mechanical photo attachment.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 30-31
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  • 24
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    Some questions of an optimum probability synthesis of dynamic metalworking machine systems (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Attempts were made to develop a dynamic metal working machine tool system using probability information on external factors and independent disturbances of the parameters. The problem was optimized in two stages: (1) creation of mathematical models under conditions determined by input influences, and (2) processing the results of calculations obtained on such models. Data were obtained on the patterns of distribution of dynamic quality characteristics of the tool, vibration frequencies and amplitudes, attenuation coefficients, and duration of a transition process. These data were obtained using a digital computer, statistical test methods, or logical possibility trees.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 34
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  • 25
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    Apparatus for monitoring the condition of mining machinery transmissions (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: A portable apparatus is reported for measuring vibro-acoustic signals of mining machine transmissions for analysis of vibration levels and for damage detection. An automatic recording device connected to the detection channels permits measurments of the overall level of vibroacceleration as well as of the level in octave bands.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 28-29
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  • 26
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    Synthesis of parameters of a machine set, according to amplitudes of vibration, in the case of coaxial misalignment of shafts (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Dynamic synthesis of the coupling parameters permits the building of coaxially aligned connected machines with very small disturbing forces. Considered is the case of two machines connected by a flexible coupling; one machine is installed on shock absorbers with four degrees of freedom. A movement leveling synthesis considers the coaxial nonalignment parameters for the shaft arrangement and determines the optimum coupling rigidity at which the vibration amplitude is at a minimum.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 32-33
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  • 27
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    Method for experimental determination of the contribution of individual sources to total noise (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Multiple noise sources generating signals in a mechanical device are analyzed by considering the medium transmitting the sound as linear, and by using a band filter with bandpass for synchronous detection and signal transformation.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 7-9
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  • 28
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    Analysis of the relationship between errors in manufacture of slot connections and gear drive noises (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: On the basis of experimental research, an analysis was carried out of the effect of certain errors in manufacture of straight-barrel slots on the noise characteristics of gear drives. In carrying out the experiments, the gear crowns of the test wheels were held immovable, and only the geometric dimensions of the slots and the mutual locations of the individual elements were varied. The investigation of the effect of each factor was carried out under otherwise equal conditions, on 34:56 cog ratio gear pairs (m = 2mm), made of 40 C steel, with a gear crown accuracy of 7 X, machining fineness 7, at a speed v = 7.1 m/sec. The number of slots was 6. The clearance in slot pairs in dimension D, equal to 0.015, 0.05, 0.08 and 0.110 mm, was obtained by change in the outer diameter of the spindle by means of polishing. The results of the tests of the experimental wheels showed that their noise level increases with increase in clearance.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 245-246
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  • 29
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    Algorithm for processing vibroacoustical signals, for the purpose of early detection of change in condition of a machine (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: The detection of defects in machines and their effects on machine condition were studied. Defects were determined from a comparison of changes in vibroacoustical signal curves in the machine with current characteristics. Data were obtained using probability distribution functions.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 166-168
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  • 30
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    Adhesion and friction of PTFE in contact with metals as studied by Auger spectroscopy, field ion and scanning electron microscopy (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Wear; 26; Oct. 197
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  • 31
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    Free suspension processing of oxides to form amorphous oxide materials, appendix B (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The processing of yttria, zirconia, and alumina under weightless conditions is discussed. The process consists of levitation or position control, heating and melting, superheating, and supercooling. The use of arc imaging furnaces, lasers, induction heating, microwave, and electron beam methods are analyzed to show the advantages and disadvantages of each.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Study for Identification of Beneficial Uses of Space (BUS), Phase 2, Vol. 2, Book 2, Sect. 5; 24 p
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  • 32
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    Small-scale explosion seam welding. (1973)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Welding Journal; 52; Mar. 197
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  • 33
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    Acoustic emission produced during burst tests of filament-wound bottles. (1973)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Acoustic emission was recorded during burst tests of filament-wound, composite pressure vessels. Organic and graphite fibers were tested, and two different epoxy resin systems were used: one with a low and another with a relatively high cure temperature. Acoustic emission was studied for the effects of different winding patterns, artificial flaws, winding-induced fiber fraying, different resins, and different fibers. Small effects produced in the vessels by changes in these variables were greatly magnified when they appeared as changes in acoustic emission. They would, in fact, be difficult or impossible to detect by other test means.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Journal of Composite Materials; 7; July 197
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  • 34
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    Mechanical Attachment of Reusable Surface Insulation to Space Shuttle Primary Structure (1973)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-09
    Beschreibung: Three methods of attaching surface insulation tiles to shuttle primary structure have been proposed: direct bond, mechanical attachment, and subpanels with standoffs. The direct bond approach is lightweight but is difficult to refurbish and inspect. The subpanel approach is heavier but allows for easy refurbishment since subpanels are easily removed and replaced. The mechanical attachment approach allows easy refurbishment and inspection and is lightweight when an efficient insulator is used between surface insulation tiles and primary structure.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Ames Res. Center Symp. on Reusable Surface Insulation for Space Shuttle, Vol. 3; p 1029-1061
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  • 35
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    Friction, wear, and noise of slip ring and brush contacts for synchronous satellite use. (1973)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A program is being conducted for testing of slip rings for synchronous orbit application. Instrumentation systems necessary for monitoring electrical noise, friction, and brush wear at atmospheric pressure and at less than 50 nanotorr have been developed. A multiplex scheme necessary for the simultaneous recording of brush displacement, friction, and electrical noise has also been developed. Composite brushes consisting of silver-molybdenum disulfide-graphite and silver-niobium diselenide-graphite have been employed on rings of coin silver and rhodium plate. Brush property measurements made included measurement of density, electrical resistivity, shear strength, and microstructure.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
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  • 36
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    Additives (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The chemistry of lubricant additives is discussed to show what the additives are chemically and what functions they perform in the lubrication of various kinds of equipment. Current theories regarding the mode of action of lubricant additives are presented. The additive groups discussed include the following: (1) detergents and dispersants, (2) corrosion inhibitors, (3) antioxidants, (4) viscosity index improvers, (5) pour point depressants, and (6) antifouling agents.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 433-475
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  • 37
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    Theory of rheology (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The structure of the modern theory of rheology is discussed to show the assumptions and limitations. Rheology is discussed as a branch of continuum mechanics to determine the relationships between stress, strain, and strain rate which will give a closer representation of lubricant properties than the Newtonian flow equation. Rheology is also investigated as a branch of chemical physics. Consideration is limited to those theories of nonpolymeric and polymeric fluids which can represent viscoelasticity in terms of identifiable and measureable molecular characteristics. The possibility that elastic liquids may rupture in shear and linear tension analogous to the failure of solids is proposed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 187-261
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  • 38
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    Synthetic oils (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: Synthetic lubricants are discussed by chemical class and their general strengths and weaknesses in terms of lubrication properties are analyzed. Comparative ratings are given for 14 chemical classes and are used as a guide for lubricant selection. The effects of chemical structure on the properties of the lubricant are described with special emphasis on thermal stability. The diversity of synthetic lubricants which is provided by the wide range of properties permits many applications, some of which are reported.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 101-135
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  • 39
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    Wear: Corrosion and erosion (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The various forms of corrosion are discussed and the role of localized electrochemical reactions in the wear of sliding surfaces are considered. It is stated that there is evidence that fretting corrosion, stress corrosion cracking, corrosion fatigue, and erosion corrosion have as a common basis the localized electrochemical reactions caused by a combination of the induced homogeneity of the surfaces and the corrosive environment. Several processes leading to erosive wear are discussed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 527-568
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  • 40
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    Role of adsorption in liquid lubrication (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: Changes at solid-liquid interfaces caused by adsorption from solution are discussed paying attention to the following aspects: (1) stability of adsorbed films and the structure of metal-additive-film-liquid interface and effect of adsorbate orientation. (2) chemical versus physical adsorption, (3) heat of adsorption, (4) adsorption of additives, (5) activated adsorption, effect of activating adsorbates, (6) displacement phenomena at solid-liquid interfaces, (7) competition of antiwear additives, their solvents, and water, (8) effect of adsorption on the orientation of liquid in the interfacial region, and (9) relation between the chemical nature of solid surfaces and their interaction with liquid lubricants. The relevance of the above adsorption phenomena to lubrication is discussed, referring where possible to specific examples.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 477-525
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  • 41
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    Mechanics and thermodynamics in lubrication (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The causes for breakdown in the lubricant film of mineral oils are discussed. It is stated that the critical point is caused by desorption of the naturally occurring surface active agent and can be described by thermodynamic analysis. The effect of different metals in lubrication is surveyed. The problem of breakdown in elastohydrodynamic lubrication is treated phenomenologically by studying traction. The topics considered are classical and non-Newtonian explanations, anomalous film thickness and viscosity effects, surface roughness contributions, and solidification of the lubricant. Reasons for the apparent granular traction characteristics are examined.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 315-363
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  • 42
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    Mineral oils (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The characteristics of lubricants made from mineral oils are discussed. Types and compositions of base stocks are reviewed and the product demands and compositions of typical products are outlined. Processes for commercial production of mineral oils are examined. Tables of data are included to show examples of product types and requirements. A chemical analysis of three types of mineral oils is reported.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 57-100
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  • 43
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    Multi-point release mechanism (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A multi-point release mechanism used on the communications technology satellite. The mechanism is designed to jettison one large panel and to release a second panel; both panels have independent multi-point attachments to the spacecraft and require to be released in sequence. The solar array is stowed concertina fashion under 2 psi pressure to ensure that no movement occurs between the stowed folds of the array during the launch. One pair of linear pyrotechnic-actuators releases both the JBSA and the pressure plate via the release mechanism. This release mechanism has successfully passed qualification level vibration launch and thermal environment tests and has accumulated to date close to 30 successful releases.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 329-334
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  • 44
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    Environmental Capability of Liquid Lubricants (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The methods available for predicting the properties of liquid lubricants from their structural formulas are discussed. The methods make it possible to design lubricants by forecasting the results of changing the structure and to determine the limits to which liquid lubricants can cope with environmental extremes. The methods are arranged in order of their thermodynamic properties through empirical physical properties to chemical properties.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 365-431
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  • 45
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    Rheology in lubrication (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The rheological effects on lubrication are discussed. The types of lubrication considered are thick film hydrodynamic lubrication and thin film elastohydrodynamic lubrication. The temperature-viscosity, viscoelastic, shear-thinning, and normal stess effects on the lubrication of journal bearings are analyzed. A graph of the pressure distribution of viscoelastic liquids in journal bearings is provided. Mathematical models are developed to define the effects of various properties of the lubricants on friction reduction.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 263-314
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  • 46
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    Greases (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The characteristics and applications of greases are discussed. The basic components of greases are analyzed to show the types of additives used and the basis for grease classification. Manufacturing methods for soap base and nonsoap base greases are described. The tests which are conducted to determine the properties of greases are reported.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 137-185
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  • 47
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    Rocket engine bipropellant valve problems and current efforts (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: In developing the highly successful bipropellant valves for the Apollo primary propulsion engines, a variety of developmental problems were encountered and resolved. These problems and the new technology that is being pursued to eliminate or minimize these problems on the space shuttle orbital maneuvering engine are discussed. The space shuttle, being a reusable system, has new requirements of the valve. The potential effects of these requirements on valve design and potential solutions are also discussed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: The 8th Aerospace Mech. Symp. te; p 213-228
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  • 48
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    A review of the technology of noncontacting systems (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Advanced components are the fundamental building blocks of advanced systems and spacecraft. Non-contacting elements, including magnetic bearings, brushless and ironless armature motors, rotary transformers and encoders, are discussed. Most of the information presented in this paper has been generated from a continuing program of component development. The aim of this paper is to identify some of the important design features and provide a perspective on the state of development reached to date.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: The 8th Aerospace Mech. Symp.; p 117-130
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  • 49
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    High performing actuation system for use with a louver array for satellite thermal control (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A high performing actuation system has been developed to drive one pair or a set of 9 pairs of louver blades. The system uses a Bourdon spiral as the driving member. The response time of the liquid expansion of the spiral system is in the order of three seconds. Besides performance tests, qualification tests have been carried out on a prototype system, demonstrating that the actuation system withstands normal launching conditions; projected operating life of 7 years with more than 7000 cycles can be expected.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 85-96
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  • 50
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    The development and test of a long-life, high reliability solar array drive actuator (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: To meet the life and reliability requirements of five to ten year space missions, a new solar array drive mechanism for 3-axis stabilized vehicles has been developed and is undergoing life testing. The drive employs a redundant lubrication system to increase its reliability. An overrunning clutch mechanism is used to permit block redundant application of two or more drives to a common array drive shaft. Two prototype actuator and clutch assemblies, in continuous vacuum life test under load at 10 to the minus 8th power torr for more than sixteen months, have each accumulated more than 34,000 output revolutions without anomaly, the equivalent of more than seven years of operation in a 1000 km orbit or nearly ninety-five years at synchronous altitude.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 69-83
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  • 51
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    Development of and dynamic studies concerning a cable boom system prototype (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The conception of a cable boom system for a scientific spin stabilized satellite led to a flat cable stowed on a drum with a flexlead without conversion to avoid slip rings and to facilitate automatic restowage from any state of deployment. Some dynamic features of the extended cable boom and especially the comparison between round and flat cables were investigated in a phenomenological study using a test rig capable of inducing lateral, torsional and thermal cycling disturbances separately or in any combination.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 15-23
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  • 52
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    Momentum wheel with magnetic bearings (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: An engineering model of a momentum wheel is described that is suspended by magnetic bearings. It consists of a mechanical assembly on the right, and associated electronics on the left. The momentum wheel is mounted at the center of the rotor shaft and the magnetic bearings are on each end. The rotor is magnetically suspended so there is no physical contact between the rotor and the support structure. The system, therefore, can operate directly in the vacuum environment without lubrication; and it has virtually unlimited operating lifetime, independent of speed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Significant Accomplishments in Technol., 1972; p 49-52
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  • 53
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    Liquid lubricants - functions and requirements (1973)
    In:  Other Sources
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    Publikationsdatum: 2016-06-07
    Beschreibung: The state of liquid lubricant technology is discussed. The limit of present knowledge, especially in the boundary regime, is analyzed. Factors such as colloid behavior, viscoelastic effects, and relaxation times are investigated. Specific applications problems and some lubricant requirements which have not been met are reported.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Lewis Res. Center Interdisciplinary Approach to Liquid Lubricant Technol.; p 1-55
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  • 54
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    Polyurethane retainers for ball bearings (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Evaluation of a new ball bearing retainer material is reported. A special composite polyurethane foam ball retainer has been developed that has virtually zero wear, is chemically inert to hydrocarbon lubricants, and stores up to 60 times as much lubricant per unit volume as the most commonly used retainer material, cotton phenolic. This new retainer concept shows promise of years of ball bearing operation without reoiling, based on life testing in high vacuum.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 317-327
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  • 55
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    Control valve: Hot gas fast response (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The design of a warm gas control valve is reviewed outlining the problems posed by the requirement for extremely fast response combined with a severe environment and a hot, dirty, and corrosive operating fluid.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 237-244
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  • 56
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    A new approach to long-life noncontacting electromechanical devices (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Brushless dc motors are finding increasing application in space. Likewise, with the advent of the light emitting diode, noncontacting encoders are gradually replacing sliding contact types. The direct drive concept has proved its merit and is now the preferred approach for tape recorders and low to moderate torque instrument drives. The final step in this evolution is the magnetic bearing, which now appears feasible for several applications. Where it can be applied in a totally noncontacting system, life and reliability will be a function of the electronic controls, where redundancy, derating, and quality assurance approaches virtually assure the desired lifetime and failure rate.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: The 8th Aerospace Mech. Symp.; p 109-116
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  • 57
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    Design and development of a momentum wheel with magnetic bearings (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: An engineering model momentum wheel with radial magnetic bearings has been designed and developed and successfully operated to a speed of approximately 500 rad/sec. This speed corresponds to a maximum angular momentum of 83 Nm-sec which is 83% of the design value. The maximum momentum achieved was limited by the suspension servo bandwidth and this, in turn, was limited by the lowest structural resonance of the rotor.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: The 8th Aerospace Mech. Symp. te; p 131-143
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  • 58
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    Current European developments in solar paddle drives (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The European Space Research and Technology Centre (ESTEC) is sponsoring the development of a number of critical spacecraft hardware items. The hardware under development includes two competing solar paddle drives which are being produced to similar specifications. Three mechanisms of each type are being produced and will undergo thermal vacuum testing. All mechanisms have lead lubricated bearings.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 49-58
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  • 59
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    Telescopic booms for the Hawkeye spacecraft (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Several boom arrangements were proposed for the Hawkeye spacecraft. The design chosen to fly consists of one pair of stem roll-out booms and a set of telescopic booms. Some of the advantages of choosing this boom configuration were that the booms could be stored in the belt line area, which is near the center of gravity of the spacecraft, and also with the approach the telescopic booms could be extended at the spacecraft's initial spin rate (180 rpm). By being able to extend these booms at the initial spin rate of the spacecraft the need for a despin system was eliminated, thus weight saving to the spacecraft. With the method of storage and extension employed by the telescopic design, the desirable sensor distance from the spacecraft could also be attained.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 59-68
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  • 60
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    Development of the elevation drive assembly for orbiting solar observatory I (EYE) (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The requirements for pointing accuracy, friction, and power for the elevation drive assembly of an orbiting space observatory are discussed briefly. A description of the components making up the assembly is presented. Special features requiring development testing prior to unit fabrication are more fully described together with a review of the test programs conducted and results obtained.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 97-108
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  • 61
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    Viking Lander antenna deployment mechanism (1973)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: One of the mechanisms that is included in the configuration of the Viking Mars Lander is an antenna dish deployment mechanism which utilizes a mechanical escapement device for controlling deployment. The criteria require that the mechanism be capable of deploying the antenna under a wide range of aiding and retarding winds after landing on Mars but must limit the acceleration during deployment and latching of the antenna. Adding to the complexity of the design are the requirements for very accurate alignment after erection and heat sterilization prior to launch. This mechanism has been designed, fabricated and successfully tested to qualification test levels for usage on the Viking mission.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 257-269
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  • 62
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    Development of a process for producing ribbon shaped boron filaments (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A ribbon-shaped boron filament with a tensile strength of 138 KN/sq cm (200 ksi) was investigated. The investigation was carried out using both carbon and tungsten as substrate materials. No satisfactory results were obtained utilizing uncoated, copper-plated or silicon carbide coated tungsten ribbon substrates. Carbon ribbon substrates were prepared by pyrolysis of stretched polyimide tape. A severe deposition gradient occurred in all dc reactor experiments due to convective cooling at the edge of the substrate that resulted in a weak, nonuniform filament. RF heating, however, completely eliminated this gradient problem and a 90 cm (35.5 in.) long boron ribbon was produced at .85 cm/sec (100 ft/hr) using a frequency of 40.68 megahertz. This boron ribbon, however, exhibited a light-bulb effect during deposition to 59 KN/sq cm (85.7 ksi) were obtained from this ribbon. Several silicon carbide ribbon shaped filaments were also produced during this investigation by decomposition of CH3SiHCl2 onto carbon substrates. Contrary to the boron work, silicon carbide ribbon was readily prepared in dc static reactors. A very uniform and smooth deposition was obtained with strengths up to 71.1 KN/sq cm (103.5 ksi).
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-132356
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  • 63
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    Adhesive-bonded scarf and stepped-lap joints (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Continuum mechanics solutions are derived for the static load-carrying capacity of scarf and stepped-lap adhesive-bonded joints. The analyses account for adhesive plasticity and adherend stiffness imbalance and thermal mismatch. The scarf joint solutions include a simple algebraic formula which serves as a close lower bound, within a small fraction of a per cent of the true answer for most practical geometries and materials. Digital computer programs were developed and, for the stepped-lap joints, the critical adherend and adhesive stresses are computed for each step. The scarf joint solutions exhibit grossly different behavior from that for double-lap joints for long overlaps inasmuch as that the potential bond shear strength continues to increase with indefinitely long overlaps on the scarf joints. The stepped-lap joint solutions exhibit some characteristics of both the scarf and double-lap joints. The stepped-lap computer program handles arbitrary (different) step lengths and thickness and the solutions obtained have clarified potentially weak design details and the remedies. The program has been used effectively to optimize the joint proportions.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-112237
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  • 64
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    Adhesive-Bonded Single-Lap Joints (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: For abstract, see N74-13195.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-112236
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  • 65
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    Adhesive-bonded double-lap joints (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Explicit analytical solutions are derived for the static load carrying capacity of double-lap adhesive-bonded joints. The analyses extend the elastic solution Volkersen and cover adhesive plasticity, adherend stiffness imbalance and thermal mismatch between the adherends. Both elastic-plastic and bi-elastic adhesive representations lead to the explicit result that the influence of the adhesive on the maximum potential bond strength is defined uniquely by the strain energy in shear per unit area of bond. Failures induced by peel stresses at the ends of the joint are examined. This failure mode is particularly important for composite adherends. The explicit solutions are sufficiently simple to be used for design purposes
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-112235
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  • 66
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    Space shuttle seal material and design development for earth storable propellant systems (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The results of a program to investigate and characterize seal materials suitable for space shuttle storable propellant systems are given. Two new elastomeric materials were identified as being potentially superior to existing state-of-the art materials for specific sealing applications. These materials were AF-E-124D and AF-E-411. AF-E-124D is a cured perfluorinated polymer suitable for use with dinitrogen tetroxide oxidizer, and hydrazine base fuels. AF-E-411 is an ethylene propylene terpolymer material for hydrazine base fuel service. Data are presented relative to low and high temperature characteristics as well as propellant exposure effects. Types of data included are: mechanical properties, stress strain curves, friction and wear characteristics, compression set and permeability. Sealing tests with a flat poppet-seal valve were conducted for verification of sealing capability. A bibliography includes over 200 references relating to seal design or materials and presents a concise tabulation of the more useful seal design data sources.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-134067 , TRW-22539-6001-RO-00
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  • 67
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    Advanced technology for space shuttle auxiliary propellant valves (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Valves for the gaseous hydrogen/gaseous oxygen shuttle auxiliary propulsion system are required to feature low leakage over a wide temperature range coupled with high cycle life, long term compatibility and minimum maintenance. In addition, those valves used as thruster shutoff valves must feature fast response characteristics to achieve small, repeatable minimum impulse bits. These valve technology problems are solved by developing unique valve components such as sealing closures, guidance devices, and actuation means and by demonstrating two prototype valve concepts. One of the prototype valves is cycled over one million cycles without exceeding a leakage rate of 27 scc's per hour at 450 psia helium inlet pressure throughout the cycling program.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-120975 , S-1261
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  • 68
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    Analysis of stresses at the bore of a drilled ball operating in a high-speed bearing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Three-dimensional stress distributions were calculated for both a regular drilled ball with a stiffening web. The balls were 20.6 mm (0.8125 in.) in diameter and had a 12.6 mm (0.496 in.) diameter concentric hole. The stiffening web was 1.5 mm (0.06 in.) thick. The calculations showed that a large reversing tangential stress at the hole bore was reduced by one-half by the addition of the web.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7501 , E-7405
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  • 69
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    Elastohydrodynamic film thickness formula based on X-ray measurements with a synthetic paraffinic oil (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An empirical elastohydrodynamic film thickness formula for heavily loaded contacts based upon X-ray film thickness measurements made with a synthetic paraffinic oil is presented. The deduced relation was found to adequately reflect the high load dependence exhibited by the measured minimum film thickness data at high Hertizian contact stresses, that is, above 1.04 x 10 to the ninth N/sq m (150,000 psi). Comparisons were made with the numerical results from a theoretical isothermal film thickness formula. The effects of changes in contact geometry, material, and lubricant properties on the form of the empirical model are also discussed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7502 , E-7041
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  • 70
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    In-flight and laboratory vacuum-friction test results (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Coefficient of friction measurements were made for six unlubricated metal couples exposed to the space environment aboard the OV-1-13 spacecraft and exposed to laboratory vacuum. Materials studied included mutually soluble, partially soluble, and insoluble metal combinations. Two samples of each material couple were tested in space and in the laboratory using the disk and rider technique. Linear velocity was 0.10 cm/s (2.5 in/min) and rider normal load was 4.45 N (1 lb) for the gold versus silver couples and 8.90 N (2lb) for the other combinations. Results showed that friction data obtained in a clean ion-pumped laboratory vacuum of 10 to the minus 10 power materials with low mutual solubility can be correlated to operation in the vicinity of a typical scientific spacecraft that is exposed to an ambient pressure as low as 10 to the minus 12 power torr. The expected increase in coefficient of friction with solubility was shown. Material couples with high mutual solubility present the hazard of unpredictable drastic friction increase in orbit which may not be evident in laboratory testing at levels down to 10 to the minus 10 power torr. It was also shown that gross cold welding of unlubricated metals exposed to a satellite environment does not occur.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7419 , G-7339
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  • 71
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    High temperature lubricant screening and systems studies (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Four candidate lubricants for next generation aircraft gas turbine application were tested under open atmosphere conditions in a rig simulating an advanced engine 125 mm bore mainshaft thrust bearing position. Testing was conducted at speeds to 24,000 rpm (3,000,000 bearing DN), bearing ring temperature of 500 F, and with 1200 F air and 100 psi differential pressure across the seals installed in a dual tandem arrangement. Test bearing was a 125 mm bore split inner ring, outer race riding angular contact ball bearing under a 3280 lb. thrust load. One lubricant, a type 2 ester, performed extremely well. The mainshaft seal limited the performance. Numerous design improvements for this seal were indicated.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-121188 , SKF-AL73T024
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  • 72
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    Viking orbiter 1975 articulation control actuators (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The articulation subsystem actuators were rigorously tested in severe environments. They were operated through temperature ranges from -73 C to +121 C. In each case the temperature rate of change was at maximum. The actuator under test at room temperature was put into a pre-chilled or preheated chamber. Satisfactory performance was obtained throughout this full temperature range and under the temperature shock conditions above. However, at temperatures below -78 C some leakage was experienced through the O-ring seal around the shaft. The actuators were subjected to severe vibration and 500 g shock test with a time duration of 0.0007 seconds. The scan actuator was life tested by operating it from stop to stop through 2,000 cycles with 20,000 start-stop procedures randomly distributed through the 2,000 cycles.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA. Langley Res. Center The 8th Aerospace Mech. Symp.; p 335-350
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  • 73
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    Engineering report. Part 1: NASA wheel air seal development for space shuttle type environmental requirements (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The sealing techniques are studied for existing aircraft wheel-tire designs to meet the hard vacuum .00001 torr and cold temperature -65 F requirements of space travel. The investigation covers the use of existing wheel seal designs.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-134128 , REPT-4239-PT-1
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  • 74
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    Design of various fixed-geometry water-lubricated hydrodynamic journal bearings for maximum stability (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: This publication is the result of over 260 fractional-frequency-whirl stability tests on a variety of fixed-geometry journal bearings. It is intended principally as a guide in the selection and design of antiwhirl bearings that must operate at high speeds and low loads in low-viscosity fluids such as water or liquid metals. However, the various fixed-geometry configurations can be employed as well in applications where other lubricants, such as oil, are used and fractional-frequency whirl is a problem. The important parameters that effect stability are discussed for each bearing type, and design curves to facilitate the design of optimum-geometry bearings are included. A comparison of the stability of the different bearing configurations tested is also given.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-SP-333 , LC-73-600235
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  • 75
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    Test characteristics of a welded rotor in a 36,000-rpm Lundell alternator (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Two four-pole Lundell-type rotors consisting of magnetic and nonmagnetic materials were fabricated by weld-depositing Inconel 625 between two sections of AISI 4617 steel. The rotors had a major diameter of 8.28 cm (3.26 in.). Saturation curves for load and no-load conditions with one of the rotors installed in a 1200-Hz Brayton-cycle research alternator are presented. The other identical rotor was spin-tested to a speed of 63,000 rmp, which was equal to 175 percent of the rated speed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TM-X-2944 , E-7535
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  • 76
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    Small, high-pressure ratio compressor mechanical acceptance test, volume 2 (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The fabrication and mechanical testing of the high-pressure-ratio compressor are reported. Mechanical testing was performed to demonstrate overspeed capability, adequate rotor dynamics, electrical isolation of the gas bearing trunnion mounted diffuser and shroud and the effect of operating parameters (speed and pressure ratio) on clearance of the compressor test rig. The speed range covered was 20 to 120 percent of rated speed (80,000 rpm). Following these tests an acceptance test which consisted of a 5 hour run at 80,000 rpm was made with approximately design impeller to shroud clearances. For Vol. 1, see N73-26483.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-121193 , APS-5404-R-VOL-2
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  • 77
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    Active-standby servovalue/actuator development (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A redundant, fail/operate fail/fixed servoactuator was constructed and tested along with electronic models of a servovalve. It was found that a torque motor switch is satisfactory for the space shuttle main engine hydraulic actuation system, and that this system provides an effective failure monitoring technique.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-124299 , HR-73700068
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  • 78
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    Effect of lubricant extreme pressure additives on rolling element fatigue life (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The effects of surface active additives on rolling-element fatigue life were investigated with the five-ball fatigue tester at conditions where classical subsurface initiated rolling-element fatigue is the sole mode of failure. Test balls of AISI 52100, AISI M-50, and AISI 1018 were run with an acid-treated white oil containing either 2.5 percent sulfurized terpene, 1 percent didodecyl phosphite, or 5 percent chlorinated wax. In general, it was found that the influence of surface active additives was detrimental to rolling-element fatigue life. The chlorinated-wax additive significantly reduced fatigue life by a factor of 7. The base oil with the 2.5 percent sulfurized-terpene additive can reduce fatigue life by as much as 50 percent. No statistical change in fatigue life occurred with the base oil having the 1 percent didodecyl-phosphite additive. The additives used with the base oil did not change the ranking of the bearing steels where rolling-element fatigue life was of subsurface origin.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7383 , E-7337
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  • 79
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    The development and production of thermo-mechanically forged tool steel spur gears (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A development program to establish the feasibility and applicability of high energy rate forging procedures to tool steel spur gears was performed. Included in the study were relatively standard forging procedures as well as a thermo-mechanical process termed ausforming. The subject gear configuration utilized was essentially a standard spur gear having 28 teeth, a pitch diameter of 3.5 inches and a diametral pitch of 8. Initially it had been planned to use a high contact ratio gear design, however, a comprehensive evaluation indicated that severe forging problems would be encountered as a result of the extremely small teeth required by this type of design. The forging studies were successful in achieving gear blanks having integrally formed teeth using both standard and thermo-mechanical forging procedures.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-121227 , R73AEG284
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  • 80
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    Injector for use in high voltage isolators for liquid feed lines (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An improved injector is described for use in introducing fluid substances into feed lines employed in delivering flowing bodies of liquids. The injector includes a porous plug, concentrically related to a feed line, including an internally tapered surface of a truncated conical configuration with an inlet orifice of a first diameter substantially smaller than the first diameter and an external surface circumscribed by an annular chamber containing a body of insulating gas.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
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  • 81
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    Apparatus and method for skin packaging articles (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A system for skin packaging articles including a loading zone for positioning articles to be packaged upon a substrate, a thermoplastic film heating and vacuum operated skin packaging zone for covering the articles with film laminated to the substrate and a slitting zone for separating and trimming the individual skin packaged articles. The articles are passed to the successive zones. The loading zone may be adapted for conveyorized instead of hand loading. In some cases, where only transverse cutting of the film web is necessary, it may be desirable to eliminate the slitting zone and remove the skin packaged article or articles directly from the packaging zone. A conveniently located operating panel contains controls for effecting automatic, semiautomatic or manual operation of the entire system of any portions in any manner desired.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
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  • 82
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    Liquid hydrogen turbopump rapid start program (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Effort was directed toward the completion of the coated feed system testing and data analysis of both the uncoated and coated system tests. A total of 11 tests were conducted with the coated feed system during three days of testing. Chill data was acquired for thermal conditioning of the system from ambient initial conditions, using a duct inlet propellent pressure of 72 psig. After three tests to determine steady state pump performance and nominal start transient operation, three coated system turbopump starts were attempted with various degrees of prechill.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-124262 , ASR-73-172 , MPR-20
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  • 83
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    Auger analysis of oxygen and sulfur interactions with various metals and the effect of sliding on these interactions (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Various gases were adsorbed to copper, aluminum, and chromium surfaces. The gases included oxygen, hydrogen sulfide, methyl mercaptan, and sulfur dioxide. Chemisorption was conducted on static surfaces and during dynamic friction experiments. An Auger cyclindrical mirror analyzer was used to monitor surface films. The sulfur containing gases adsorbed readily to all surfaces. Exposures of as little as 0.000001 (torr)(sec) (1 langmuir) were sufficient to reduce friction. Sliding contact did not affect chemisorption of copper or aluminum but did affect chemisorption to chromium surfaces. Oxygen removed sulfur films from all surfaces at room temperature (23 C). Gaseous exposures were from 0.000001 to 0.01 (torr)(sec) (1 to 10,000 langmuirs).
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7340 , E-7411
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  • 84
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    Chemical pump study (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Sorption pumps applicable to the Pioneer Venus Mass Spectrometer Experiment were investigated. The pump requirements are discussed, and a survey of the existing pumps presented. Zirconium and zirconium graphite products were found to be the most promising among the getter materials surveyed. A preliminary pump design for the noble gas experiment is discussed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-114594
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  • 85
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    Fluorine lubricated bearing technology (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An experimental program was conducted to evaluate and select materials for ball bearings intended for use in liquid fluorine and/or FLOX. The ability of three different ball-separator materials, each containing nickel, to form and transfer a nickel fluoride film to provide effective lubrication at the required areas of a ball bearing operating in liquid fluorine was evaluated. In addition, solid lubrication of a ball bearing operating in liquid fluorine by either a fused fluoride coating applied to all surfaces of the ball separator or by a fluoride impregnation of porous sintered material ball separators was evaluated. Less bearing wear occurred when tests were conducted in the less reactive FLOX. Bearings fabricated from any of the materials tested would have relatively short wear lives and would require frequent replacement in a reusable engine.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-120820
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  • 86
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    Thermally oscillating actuators (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The actuator was redesigned to accommodate the new thermal motor for the Helios flipper. This design retained the basic configuration and dimensions of the original actuator. Changes were made primarily to the cradle and motor assembly. Because of the increased dimensions of the thermal motor, it was necessary to increase the diameter of the pellet case and associated parts including the back off spring and the piston return spring. The new springs were designed to yield the same spring rate differential as the originals. The design effort resulted in a new top assembly and approximately twenty sub-assembly and detail drawings. A list of drawings generated by EMR is attached.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-132788
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  • 87
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    Parts, materials, and processes experience summary, volume 2 (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: This summary provides the general engineering community with the accumulated experience from ALERT reports issued by NASA and the Government-Industry. Data Exchange Program, and related experience gained by Government and industry. It provides expanded information on selected topics by relating the problem area (failure) to the cause, the investigation and findings, the suggestions for avoidance (inspections, screening tests, proper part applications, requirements for manufacturer's plant facilities, etc.), and failure analysis procedures. Diodes, integrated circuits, and transistors are covered in this volume.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-SP-6507-VOL-2
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  • 88
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    Augmentation of machine structure to improve its diagnosability (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Two methods of augmenting the structure of a sequential machine so that it is diagnosable are presented. The checkable (checking sequences) and repeated symbol distinguishing sequences (RDS) are discussed. It was found that as few as twice the number of outputs of the given machine is sufficient for constructing a state-output augmentation with RDS. Techniques for minimizing the number of states in resolving convergences and in resolving equivalent and nonreduced cycles are developed.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-136497 , REPT-010261-6-T , SEL-TR-71
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  • 89
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    Interaction of some extreme-pressure type lubricating compounds with an iron surface (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An iron surface was exposed to the extreme-pressure type lubricant benzyl chloride, dichlorophenyl phosphine, dichlorophenyl phosphine sulfide, ophenyl phosphine oxide. Iron, in the sputter-cleaned state, was exposed to these materials statically and during dynamic friction experiments. With benzyl chloride only chlorine adsorbed to the surface, and with dichlorophenyl phosphine no adsorption occurred, while the addition of sulfur to that same molecular structure resulted in the promotion of carbon and chlorine adsorption. substitution of oxygen for sulfur in the dichlorobenzyl phosphine molecule resulted in carbon, chlorine, and oxygen adsorption. With none of the phosphorus containing molecules was phosphorus detected on the surface. Sliding in an atmosphere of benzyl chloride promoted adsorption of chlorine to the iron surface. Increases in load resulted in a decrease in the surface concentration of iron chloride.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7528 , E-7600
    Format: application/pdf
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  • 90
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    The robustness of reliability predictions for series systems of identical components. (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The robustness of reliability predictions based on the exponential failure law is investigated under possible deviations within the Weibull family of failure distributions. Regions of robustness are provided for series systems of N identical components, N = 1(1)15; i.e., regions in the space of the Weibull shape parameter, within which one may safely use the exponential prediction procedure and have no more than a prespecified error.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: IEEE Transactions on Reliability; R-22; Oct. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 91
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    Nondestructive shell-stability estimation by a combined-loading technique. (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The variation of specimen lateral stiffness with compressive axial loading is studied experimentally, and it is demonstrated that buckling loads can be predicted for monocoque shells from such data. A study of the initial specimen geometry is presented, and an evaluation is made of its effect on the distribution of stiffness at zero axial load. When the lateral test force used to determine the stiffness is considered as a destabilizing load in combination with the axial compression, it is shown that critical values of the force can be estimated by the 'Southwell plot' procedure. These critical forces can be correlated with axial load and extrapolated to yield an accurate estimate of the buckling load.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 92
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    Resistance diffusion bonding boron/aluminum composite to titanium. (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 93
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    Unbekannt
    Some observations of the relationship between film thickness and load in high Hertz pressure sliding elastohydrodynamic contacts. (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: ASME PAPER 73-LUB-D
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 94
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    Nondestructive testing: A survey (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Principles and applications of nondestructive tests
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-SP-5113 , LC-72-600247
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 95
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    Welding blades to rotors (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A process is described to form T-joints between dissimilar thickness parts by magnetic force upset welding. This type of resistance welding is used to join compressor and turbine parts which thereby reduces the weight and cost of jet engines.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 96
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    Small, high pressure ratio compressor: Aerodynamic and mechanical design (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The Small, High-Pressure-Ratio Compressor Program was directed toward the analysis, design, and fabrication of a centrifugal compressor providing a 6:1 pressure ratio and an airflow rate of 2.0 pounds per second. The program consists of preliminary design, detailed areodynamic design, mechanical design, and mechanical acceptance tests. The preliminary design evaluate radial- and backward-curved blades, tandem bladed impellers, impeller-and diffuser-passage boundary-layer control, and vane, pipe, and multiple-stage diffusers. Based on this evaluation, a configuration was selected for detailed aerodynamic and mechanical design. Mechanical acceptance test was performed to demonstrate that mechanical design objectives of the research package were met.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-120941 , APS-5404-R-VOL-1
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 97
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    Dynamic and thermal analysis of high speed tapered roller bearings under combined loading (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The development of a computer program capable of predicting the thermal and kinetic performance of high-speed tapered roller bearings operating with fluid lubrication under applied axial, radial and moment loading (five degrees of freedom) is detailed. Various methods of applying lubrication can be considered as well as changes in bearing internal geometry which occur as the bearing is brought to operating speeds, loads and temperatures.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-121207 , SKF-AL73P010
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 98
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    Development of helicopter transmission seals, task 2 (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: High speed helicopter transmission seal concepts were designed, fabricated and tested. The concepts were a dual element split ring seal and a circumferential seal. The tests were performed in a rig using an actual input quill assembly. The test conditions were selected to simulate transmission operation and were 230 F oil temperature, and a sliding speed of 9400 ft/min. The split ring seal exhibited gross leakage and was considered unsatisfactory, while the circumferential seal leakage was less than 1 c.c./hour; this leakage is within acceptable limits. The circumferential seal wear was only to .0005 inches during a 100 hour run (40 starts and stops). During a 40 hour contamination test (mesh silica flour) the seal total wear was a maximum of .004 inches. This wear is considered acceptable.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-120983 , SER-50776
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 99
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    Fan and pump noise control (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The development is described of improved, low noise level fan and pump concepts for the space shuttle. In addition, a set of noise design criteria for small fans and pumps was derived. The concepts and criteria were created by obtaining Apollo hardware test data to correlate and modify existing noise estimating procedures. A set of space shuttle selection criteria was used to determine preliminary fan and pump concepts. These concepts were tested and modified to obtain noise sources and characteristics which yield the design criteria and quiet, efficient space shuttle fan and pump concepts.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-128986 , SVHSER-6183
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 100
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    Floating baffle to improve efficiency of liquid transfer from tanks (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A floating baffle is described which rides up and down on a vertical shaft over a drain in a tank as the liquid level within the tank varies. When the baffle is in the raised position, the liquid is allowed to flow out of the drain at an unrestricted rate. When the baffle is in the lowered position, pull-through of air or gas that is above the liquid is presented, which would interfere and reduce the flow of liquid from the tank.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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