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Experimental demonstration of radiat...

Mireles, Omar R.

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Experimental demonstration of radiation effects on the performance of a stirling-alternator convertor and candidate materials evaluation.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Experimental demonstration of radiation effects on the performance of a stirling-alternator convertor and candidate materials evaluation./
作者:	Mireles, Omar R.
面頁冊數:	288 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-08, Section: B, page: .
Contained By:	Dissertation Abstracts International71-08B.
標題:	Engineering, Aerospace. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3416708
ISBN:	9781124128030

Experimental demonstration of radiation effects on the performance of a stirling-alternator convertor and candidate materials evaluation.
Mireles, Omar R.

Experimental demonstration of radiation effects on the performance of a stirling-alternator convertor and candidate materials evaluation. - 288 p.

Source: Dissertation Abstracts International, Volume: 71-08, Section: B, page: .

Thesis (Ph.D.)--University of Florida, 2010.

Free-piston Stirling power convertors are under consideration by NASA for service in the Advanced Stirling Radioisotope Generator (ASRG) and Fission Surface Power (FSP) systems to enable aggressive exploration missions by providing a reliable and constant power supply. The ASRG must withstand environmental radiation conditions, while the FSP system must tolerate a mixed neutron and gamma-ray environment resulting from self-irradiation. Stirling-alternators utilize rare earth magnets and a variety of organic materials whose radiation limits dominate service life estimates and shielding requirements. The project objective was to demonstrate the performance of the alternator, identify materials that exhibit excessive radiation sensitivity, identify radiation tolerant substitutes, establish empirical dose limits, and demonstrate the feasibility of cost effective nuclear and radiation tests by selection of the appropriate personnel and test facilities as a function of hardware maturity.

ISBN: 9781124128030Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Experimental demonstration of radiation effects on the performance of a stirling-alternator convertor and candidate materials evaluation.
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245 1 0 $a Experimental demonstration of radiation effects on the performance of a stirling-alternator convertor and candidate materials evaluation.
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500 $a Adviser: Edward Dugan.
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520 $a Free-piston Stirling power convertors are under consideration by NASA for service in the Advanced Stirling Radioisotope Generator (ASRG) and Fission Surface Power (FSP) systems to enable aggressive exploration missions by providing a reliable and constant power supply. The ASRG must withstand environmental radiation conditions, while the FSP system must tolerate a mixed neutron and gamma-ray environment resulting from self-irradiation. Stirling-alternators utilize rare earth magnets and a variety of organic materials whose radiation limits dominate service life estimates and shielding requirements. The project objective was to demonstrate the performance of the alternator, identify materials that exhibit excessive radiation sensitivity, identify radiation tolerant substitutes, establish empirical dose limits, and demonstrate the feasibility of cost effective nuclear and radiation tests by selection of the appropriate personnel and test facilities as a function of hardware maturity.
520 $a The Stirling Alternator Radiation Test Article (SARTA) was constructed from linear alternator components of a Stirling convertor and underwent significant pre-exposure characterization. The SARTA was operated at the Sandia National Laboratories Gamma Irradiation Facility to a dose of over 40 Mrad. Operating performance was within nominal variation, although modestly decreasing trends occurred in later runs as well as the detection of an electrical fault after the final exposure. Post-irradiation disassembly and internal inspection revealed minimal degradation of the majority of the organic components.
520 $a Radiation testing of organic material coupons was conducted since the majority of the literature was inconsistent. These inconsistencies can be attributed to testing at environmental conditions vastly different than those Stirling-alternator organics will experience during operation. Samples were irradiated at the Texas A&M TRIGA reactor to above expected FSP neutron fluence. A thorough materials evaluation followed and results indicate that the majority of material properties experienced minimal statistically significant change.
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