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  • Other Sources  (266)
  • MACHINE ELEMENTS AND PROCESSES  (260)
  • LUNAR AND PLANETARY EXPLORATION
  • 1970-1974  (266)
  • 1972  (266)
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  • Other Sources  (266)
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  • 1970-1974  (266)
Year
  • 1
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    Rocket nozzle automatic release system (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The function of the mechanism described is to automatically jettison a rocket nozzle element at the conclusion of boost in order to achieve a cruise mode nozzle configuration for the balance of powered flight. The boost nozzle is retained by latched pistons that are mechanically secured until released by chamber pressure, which simultaneously assumes retention of the nozzle by holding the primary piston in place. Upon attainment of cruise mode, the chamber pressure drops, allowing springs to overcome the primary piston force and pull the keeper ring forward to free the nozzle for jettison by motor exhaust.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 51-55
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Pioneer F/G feed movement mechanism (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The Pioneer F/G spacecraft achieves the desired earth-pointing direction through a system requiring the shifting of the main antenna feed 1 in. off axis. The feed is pivoted to this position by an electrically heated thermal actuator consisting of an electroless nickel bellows in a copper housing and filled with Freon 21. The actuator overtravels and maintains the feed in the offset position in a thermostatic limit cycle operation mode until commanded off. The mechanism is expected to operate in a -240 F environment near Jupiter and was successfully tested at such temperatures.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 21-26
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A space qualified radiation source holder (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A radiation source holder was developed to permit controlled exposure of biological material to a gamma-emitting radiation source during flight in a recoverable earth-orbiting satellite. A unique spring drive mechanism, activated by real time commands from the ground station, moved the Sr-85 source from a shielded position to the exposed position and then back to the shielded condition before reentry and recovery. A fail-safe feature utilized the reentry deceleration force to ensure that the source would be in a shielded position during the recovery operations. The device was successfully flown on Biosatellite 2.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: 6th Aerospace Mech. Symp.; p 9-12
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A solid state film transport (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A solid state film transport utilizing piezoelectric motion was evaluated and found to have potential in film positioning applications. The concept is particularly useful in flight equipment where torque motors and conventional transport mechanisms are difficult to apply. A demonstration model utilizing 5-inch film was designed, tested, and evaluated. Three basic operating modes were investigated. Design goals for step size were achieved under controlled conditions. The continuous mode test results were marred by an inability to transfer efficiently the piezoceramic motion to the film itself. The design, test results, and problem areas are described.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 127-133
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Aerospace reliability applied to biomedicine. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An analysis is presented that indicates that the reliability and quality assurance methodology selected by NASA to minimize failures in aerospace equipment can be applied directly to biomedical devices to improve hospital equipment reliability. The Space Electric Rocket Test project is used as an example of NASA application of reliability and quality assurance (R&QA) methods. By analogy a comparison is made to show how these same methods can be used in the development of transducers, instrumentation, and complex systems for use in medicine.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Adhesion, friction, wear, and lubrication research by modern surface science techniques. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The field of surface science has undergone intense revitalization with the introduction of low-energy electron diffraction, Auger electron spectroscopy, ellipsometry, and other surface analytical techniques which have been sophisticated within the last decade. These developments have permitted submono- and monolayer structure analysis as well as chemical identification and quantitative analysis. The application of a number of these techniques to the solution of problems in the fields of friction, lubrication, and wear are examined in detail for the particular case of iron; and in general to illustrate how the accumulation of pure data will contribute toward the establishment of physiochemical concepts which are required to understand the mechanisms that are operational in friction systems. In the case of iron, LEED, Auger and microcontact studies have established that hydrogen and light-saturated organic vapors do not establish interfaces which prevent iron from welding, whereas oxygen and some oxygen and sulfur compounds do reduce welding as well as the coefficient of friction. Interpretation of these data suggests a mechanism of sulfur interaction in lubricating systems.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Friction welding. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Results of an exploratory study of the structure and properties of friction welds in Udimet 700 (U-700) and TD-nickel (TD-Ni) bar materials, as well as dissimilar U-700/TD-Ni friction welds. Butt welds were prepared by friction welding 12.7-mm-diam U-700 bars and TD-Ni bars. Specimens for elevated temperature tensile and stress rupture testing were machined after a postweld heat treatment. Friction welding of U-700 shows great potential because the welds were found to be as strong as the parent metal in stress rupture and tensile tests at 760 and 980 C. In addition, the weld line was not detectable by metallographic examination after postheating. Friction welds in TD-Ni or between U-700 and TD-Ni were extremely weak at elevated temperatures. The TD-Ni friction welds could support only 9% as much stress as the base metal for 10-hour stress rupture life at 1090 C. The U-700/TD-Ni weld could sustain only 15% as much stress as the TD-Ni parent metal for a 10-hour stress rupture life at 930 C. Thus friction welding is not a suitable joining method for obtaining high-strength TD-Ni or U-700/TD-Ni weldments.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Welding Journal; 51; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Practical method for diffusion welding of steel plate in air. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Description of a simple and easily applied method of diffusion welding steel plate in air which does not require a vacuum furnace or hot press. The novel feature of the proposed welding method is that diffusion welds are made in air with deadweight loading. In addition, the use of an autogenous (self-generated) surface-cleaning principle (termed 'auto-vac cleaning') to reduce the effects of surface oxides that normally hinder diffusion welding is examined. A series of nine butt joints were diffusion welded in thick sections of AISI 1020 steel plate. Diffusion welds were attempted at three welding temperatures (1200, 1090, and 980 C) using a deadweight pressure of 34,500 N/sq m (5 psi) and a two-hour hold time at temperature. Auto-vac cleaning operations prior to welding were also studied for the same three temperatures. Results indicate that sound welds were produced at the two higher temperatures when the joints were previously fusion seal welded completely around the periphery. Also, auto-vac cleaning at 1200 C for 2-1/2 hours prior to diffusion welding was highly beneficial, particularly when subsequent welding was accomplished at 1090 C.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Welding Journal; vol. 51
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The ATS F&G systems reliability program. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Assurance of reliability, quality, and proper testing requires a large coordinating effort and a means for connecting the various areas involved. All parts used on the spacecraft are required to meet strict specifications and consequently must be approved by the systems reliability manager. The parts program has access to a computer data bank into which all information concerning nonstandard parts approval requests has been stored. Through the data bank, the system collects and distributes timely information concerning quality and reliability to all departments that may be concerned.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Journal of Environmental Sciences; 15; Mar
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Enhanced diffusion welding of TD-NiCr sheet. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A method termed 'enhanced diffusion welding' has been developed to produce solid-state welds in TD-NiCr (Ni-20Cr-2ThO2) alloy sheet with weld strengths of 100% of the parent metal strength. Diffusion welded joints were made in specially processed TD-NiCr that equaled the tensile-shear and creep-rupture shear strengths of the parent material at 1090 deg C. The following observations have been made: specially processed TD-NiCr is preferred over commercial TD-NiCr for diffusion welding; the weld line can be eliminated when joining specially processed TD-NiCr by 600-grit sanding and electropolishing the faying surfaces prior to welding; and, a two-step weld cycle is preferred for diffusion welding of this alloy.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Welding Journal; vol. 51
    Format: text
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    NASA TECHNICAL REPORTS
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