某航天代谢模拟装置的系统可靠性综合评估

Integrated Evaluation on System Reliability of a Space Metabolism Simulation Device

目的利用某航天代谢模拟装置组成单元的研制期间试验数据 ,给出该装置系统可靠性置信下限值。方法依据AMSAA模型给出了一种确定时间环境折合系数的新方法 ,进而得到各单元MTBF点估计和置信下限 ,最后利用L -M法给出该装置系统可靠度置信下限值。结果该装置在置信度为 0 .8下的系统可靠度置信下限值为 0 .92 81 ,与依据经典的系统可靠性评估方法得到的结果相接近。结论应用该方法进行系统可靠性综合评估可以较好地满足工程上的需求。

Objective To define the lower confidence limit of the system reliability of the space metabolism simulation device by using the test data of the comprising units in their development phases. Method A new method for defining the environmental conversion factors of failure times has been given basing on the AMSAA model, and the MTBF point evaluated values and lower confidence limits of the units were defined, at last, the lower confidence limit of the system reliability was obtained using L M method. Result The lower confidence limit of the system reliability under confidence level of 0.8 is 0.9281, which is consistent with the result obtained by the classic system reliability evaluation method. Conclusion Integrated system reliability evaluation using the proposed method can well satisfy the need in engineering.