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SRG110 Stirling Generator Dynamic Simulator Vibration Test Results and Analysis CorrelationThe U.S. Department of Energy (DOE), Lockheed Martin (LM), and NASA Glenn Research Center (GRC) have been developing the Stirling Radioisotope Generator (SRG110) for use as a power system for space science missions. The launch environment enveloping potential missions results in a random input spectrum that is significantly higher than historical RPS launch levels and is a challenge for designers. Analysis presented in prior work predicted that tailoring the compliance at the generator-spacecraft interface reduced the dynamic response of the system thereby allowing higher launch load input levels and expanding the range of potential generator missions. To confirm analytical predictions, a dynamic simulator representing the generator structure, Stirling convertors and heat sources was designed and built for testing with and without a compliant interface. Finite element analysis was performed to guide the generator simulator and compliant interface design so that test modes and frequencies were representative of the SRG110 generator. This paper presents the dynamic simulator design, the test setup and methodology, test article modes and frequencies and dynamic responses, and post-test analysis results. With the compliant interface, component responses to an input environment exceeding the SRG110 qualification level spectrum were all within design allowables. Post-test analysis included finite element model tuning to match test frequencies and random response analysis using the test input spectrum. Analytical results were in good overall agreement with the test results and confirmed previous predictions that the SRG110 power system may be considered for a broad range of potential missions, including those with demanding launch environments.
Document ID
Document Type
Suarez, Vicente J.
(NASA Glenn Research Center Cleveland, OH, United States)
Lewandowski, Edward J.
(Sest, Inc. Middleburgh Heights, OH, United States)
Callahan, John
(Pagnotta Engineering Exton, PA, United States)
Date Acquired
August 25, 2013
Publication Date
June 26, 2006
Subject Category
Energy Production And Conversion
Report/Patent Number
Meeting Information
4th International Energy Conversion Engineering Conference, San Diego, CA, June 26-29, 2006(San Diego, CA)
Funding Number(s)
WBS: WBS 138494.04.01.01
Distribution Limits
Public Use Permitted.
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