Research on Launch Vehicle Reliability Assessment of Small Sample Based on Bayes Theory

SONG Zhengyu1, FANG Zhigeng2, HE Wule1, SUN Yunke2, WANG Zhao2, LI Caixia1, LIU Sifeng2

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Journal of Deep Space Exploration ›› 2021, Vol. 8 ›› Issue (1) : 62-69. DOI: 10.15982/j.issn.2096-9287.2021.20200005
Topic:The technology of new generation medium-lift launch vehicle
Topic:The technology of new generation medium-lift launch vehicle

Research on Launch Vehicle Reliability Assessment of Small Sample Based on Bayes Theory

  • SONG Zhengyu1, FANG Zhigeng2, HE Wule1, SUN Yunke2, WANG Zhao2, LI Caixia1, LIU Sifeng2
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Abstract

Aiming at the advanced technology, high development cost and difficult implementation of reliability appraisal test of LM-8 launch vehicle, a method of reliability assessment of small sample based on Bayesian theory is proposed. According to Bayes theorem, various pre-test information is fully utilized to make up for the deficiency of experimental data. Taking Weibull life model, Exponential life model and Binomial life model as three examples of life different distribution types, corresponding mathematical model and numerical calculation method combining Bayesian theory are discussed. Finally, three different types of equipment in the launch vehicle system are selected for reliability evaluation and the results show that the proposed method can make full use of existing information, of which assessment results are superior to the classical method.

Keywords

Bayes / small sample / reliability assessment / launch vehicle

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SONG Zhengyu, FANG Zhigeng, HE Wule, SUN Yunke, WANG Zhao, LI Caixia, LIU Sifeng. Research on Launch Vehicle Reliability Assessment of Small Sample Based on Bayes Theory. Journal of Deep Space Exploration, 2021, 8(1): 62‒69 https://doi.org/10.15982/j.issn.2096-9287.2021.20200005

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