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Stirling Convertor Fasteners Reliability QuantificationOnboard Radioisotope Power Systems (RPS) being developed for NASA s deep-space science and exploration missions require reliable operation for up to 14 years and beyond. Stirling power conversion is a candidate for use in an RPS because it offers a multifold increase in the conversion efficiency of heat to electric power and reduced inventory of radioactive material. Structural fasteners are responsible to maintain structural integrity of the Stirling power convertor, which is critical to ensure reliable performance during the entire mission. Design of fasteners involve variables related to the fabrication, manufacturing, behavior of fasteners and joining parts material, structural geometry of the joining components, size and spacing of fasteners, mission loads, boundary conditions, etc. These variables have inherent uncertainties, which need to be accounted for in the reliability assessment. This paper describes these uncertainties along with a methodology to quantify the reliability, and provides results of the analysis in terms of quantified reliability and sensitivity of Stirling power conversion reliability to the design variables. Quantification of the reliability includes both structural and functional aspects of the joining components. Based on the results, the paper also describes guidelines to improve the reliability and verification testing.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Shah, Ashwin R.
(Sest, Inc. Middleburgh Heights, OH, United States)
Korovaichuk, Igor
(Sest, Inc. Middleburgh Heights, OH, United States)
Kovacevich, Tiodor
(NASA Glenn Research Center Cleveland, OH, United States)
Schreiber, Jeffrey G.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 7, 2013
Publication Date
April 1, 2006
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA Paper 2005-5507
Meeting Information
Meeting: Third International Energy Conversion Engineering Conference
Location: San Francisco, CA
Country: United States
Start Date: August 15, 2005
End Date: August 18, 2005
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 22-972-20-01
Distribution Limits
Work of the US Gov. Public Use Permitted.
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