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  • MECHANICAL ENGINEERING  (4)
  • 1
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    Design and test of a pump failure anticipator (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Tests were conducted on two different types of pumps in order to refine the concept and to finalize design details of a positive displacement internal gear pump and a shroudless centrifugal pump. A concept and a system that could be used with pumps to allow a rapid judgement to be made of the suitability of the pump for futher service is developed. Test results and detailed data analysis are included.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-120716 , REPT-74TR6
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Investigations of a bearing fault detector for railroad bearings (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The laboratory tests are described which were conducted on new and damaged bearings to determine the feasibility of using high-frequency vibration as a diagnostic tool. A high-frequency band pass filter and demodulator was assembled to permit field measurements of the high-frequency vibrations. Field tests were conducted on an actual truck and on an axle assembly run in a grease test rig. These field tests were directed toward demonstration of the suitability and capabilities of the high-frequency technique for field application. Two specific areas of field application were identified as being cost effective for railroad use. One area is the examination of railroad roller bearings at a derailment site, and the second is as a wayside detector to supplement present hot box detectors for defective roller bearings.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-144114 , REPT-75-TR-14
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetic bearings for free-piston Stirling engines (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The feasibility and efficiency of applying magnetic bearings to free-piston Stirling-cycle power conversion machinery currently being developed for long-term space missions are assessed. The study was performed for a 50-kWe Reference Stirling Space Power Converter (RSSPC) which currently uses hydrostatic gas bearings to support the reciprocating displacer and power piston assemblies. Active magnetic bearings of the attractive electromagnetic type are feasible for the RSSPC power piston. Magnetic support of the displacer assembly would require unacceptable changes to the design of the current RSSPC. However, magnetic suspension of both displacer and power piston is feasible for a relative-displacer version of the RSSPC. Magnetic suspension of the RSSPC power piston can potentially increase overall efficiency by 0.5 to 1 percent (0.1 to 0.3 efficieny points). Magnetic bearings will also overcome several operational concerns associated with hydrostatic gas bearing systems. These advantages, however, are accompanied by a 5 percent increase in specific mass of the RSSPC.
    Keywords: MECHANICAL ENGINEERING
    Type: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 5 (A93-25851 09-44); p. 5.381-5.386.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Magnetic bearings for free-piston Stirling engines (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The feasibility and efficacy of applying magnetic bearings to free-piston Stirling-cycle power conversion machinery currently being developed for long-term space missions are assessed. The study was performed for a 50-kWe Reference Stirling Space Power Converter (RSSPC) which currently uses hydrostatic gas bearings to support the reciprocating displacer and power piston assemblies. Active magnetic bearings of the attractive electromagnetic type are feasible for the RSSPC power piston. Magnetic support of the displacer assembly would require unacceptable changes to the design of the current RSSPC. However, magnetic suspension of both displacer and power piston is feasible for a relative-displacer version of the RSSPC. Magnetic suspension of the RSSPC power piston can potentially increase overall efficiency by 0.5 to 1 percent (0.1 to 0.3 efficiency points). Magnetic bearings will also overcome several operational concerns associated with hydrostatic gas bearing systems. These advantages, however, are accompanied by a 5 percent increase in specific mass of the RSSPC.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-105730 , E-7091 , NAS 1.15:105730 , Intersociety Energy Conversion Engineering Conference; Aug 03, 1992 - Aug 07, 1992; San Diego, CA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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