水下滑翔机浮力驱动系统生存分析与试验

Survival analysis and test of underwater glider′s buoyancy-driven system

水下滑翔机的可靠性直接影响了其生存能力和完成任务的能力,浮力驱动系统作为它的核心模块,其可靠性研究显得尤为重要。针对水下滑翔机浮力驱动系统故障试验数据存在缺失性的情况,采用生存分析方法对水下滑翔机PETREL-II进行了可靠性分析和评估。首先依据水下滑翔机浮力驱动系统生存删失数据,由生存分析理论的Kaplan-Meier估计方法获得了浮力驱动系统的生存曲线,然后根据原始故障数据,应用常规可靠性理论计算浮力驱动系统的故障率与可靠度,将传统可靠性理论估计结果与生存分析结果进行对比。结果表明,生存分析方法可更好地评价水下滑翔机浮力驱动系统的可靠性,对水下滑翔机整体可靠性分析提供有力支持。

Reliability was a direct factor which influence the abilities of underwater glider both in mission execution and survivability. Reliability research of buoyancy-driven system was urgent for it was one of the core part of underwater glider. This paper presented reliability evaluation of the buoyancy-driven system on underwater glider PETREL-II using survival analysis based on the censored data. Due to the fact that the survival data of underwater glider buoyancy driven system may always be censored, the survival curve was firstly described by analyzing the censored data based on Kaplan-Meier estimation. The failure rate curve of buoyancy- driven system was then obtained by calculating the original failure data based on conventional reliability theory. Comparison between the two approaches indicated that the survival analysis agreed better with experiments and might be superior in the reliability evaluation for the underwater glider.