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 Journal of the Korean Society for Quality Management 2013;41(1): 135-. doi: https://doi.org/10.7469/JKSQM.2013.41.1.135
 확률과정론을 이용한 추진장약의 성능과 저장안전성에 관한 저장신뢰성평가 박성호1, 김재훈2 1국방과학연구소 종합시험본부2충남대학교 기계설계공학과 The Stockpile Reliability of Propelling Charge for Performance and Storage Safety using Stochastic Process Sung-Ho Park1, Jae-Hoon Kim2 1Defense Systems Test Center, Agency for Defense Development2Department of Mechanical Design Engineering, Choongnam National University ABSTRACT Purpose: This paper presents a method to evaluate the stockpile reliability of propelling charge for performance and storage safety with storage time. Methods: We consider a performance failure level is the amount of muzzle velocity drop which is the maximum allowed standard deviation multiplied by 6. The lifetime for performance is estimated by non-linear regression analysis. The state failure level is assumed that the content of stabilizer is below 0.2%. Because the degradation of stabilizer with storage time has both distribution of state and distribution of lifetime, it must be evaluated by stochastic process method such as gamma process. Results: It is estimated that the lifetime for performance is 59 years. The state distribution at each storage time can be shown from probability density function of degradation. It is estimated that the average lifetime as $B_{50}$ life is 33 years from cumulative failure distribution function curve. Conclusion: The lifetime for storage safety is shorter than for performance and we must consider both the lifetime for storage safety and the lifetime performance because of variation of degradation rate. Key Words: Performance;Storage Safety;Degradation;Gamma Process;Stockpile Reliability;
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