Figure of Merit Characteristics Compared to Engineering Parameters

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TECHNICAL MEMORANDUMFIGURE OF MERIT CHARACTERISTICS COMPAREDTO ENGINEERING PARAMETERS1. INTRODUCTIONCurrent NASA lunar architecture calls for permanent human habitation of the Moon bythe year 2020. Due to the expense of delivering materials into orbit, technologies are being developedto use lunar regolith for building and as a material resource for fabrication, oxygen production,and other needs. Additionally, constant exposure to the finest size fraction of lunar regolithmay present hazards to human health. Towards developing these technologies and mitigatinghazards, lunar regolith simulants are becoming an increasingly important part of the developmentparadigm.1.1 2005 Regolith Simulant WorkshopIn January 2005, Marshall Space Flight Center (MSFC) hosted a workshop in Huntsville,AL, to discuss the future development of lunar regolith simulants. This meeting brought togethergeoscientists including some major figures in lunar geology, project managers, engineers, and simulantusers from NASA centers, academia, and private enterprise. In addition to 2 days of presentations(content is available at < http://est.msfc.nasa.gov/workshops/lrsm2005_program.html >),sessions were held to identify characteristics necessary for a lunar regolith simulant to sufficientlyserve the community. Regolith characteristics were discussed and votes were taken with regard toperceived importance. Following the 2005 workshop, Sibille et al. published a technical paper rankingthese properties. 11.2 Development of Figures of MeritBetween 2005 and 2007, the lunar regolith simulant project advanced considerably. Muchof the progress and development is evident in presentations of the October 2007 MSFC-hostedHuntsville workshop < http://isru.msfc.nasa.gov/2007wksp_docs.html >. Part of the evolution wasthe establishment of the figure of merit (FoM) mathematics and algorithm for formal, quantitativecomparison of two particulate materials composed of geologic components. 2,3 Although normallythe comparison will be between a particular sample of lunar regolith and a simulant, the FoM canalso be used to compare two simulants or two regolith samples.1
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Page 25 and 26: REFERENCES1. Sibille, L.; Carpenter
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