摘要
针对大多竞争失效可靠性研究未考虑失效阈值随机性的情况,提出一种随机失效阈值影响下的竞争失效系统可靠性评价模型。分析冲击影响下退化过程中退化量及退化率的变化,并在此基础上考虑阈值随机性。讨论累积退化影响下的冲击过程,以系统所能承受的强度分布描述冲击失效阈值,并结合累积退化量的期望水平建立随时间变化的冲击失效阈值,从而明确描述了冲击失效阈值与退化过程之间的依赖关系,给出竞争失效过程的可靠性函数。以微电机系统为例进行对比及敏感性分析,验证了随机失效阈值的引入更能反映系统真实运行状态。
Since most research on competing failure reliability do not take the unpredictability of the failure threshold into account,a competing failure reliability model that takes the randomness of the failure threshold into account is devised.The variation of degradation quantity and degradation rate under shocks was analyzed,and the randomness of the threshold was considered on this basis.The cumulative degradation under the influence of the random shock process was analyzed.The shock failure threshold is described by the strength distribution that the system can withstand,and the shock failure threshold that changes with time is established based on the expected level of cumulative degradation,so the dependence between the shock failure threshold and the degradation process is clearly described,and the reliability function of the competing failure process is given.Last but not ultimately,a micromotor system is used as a comparison and sensitivity analysis example to confirm the logic and efficacy of the suggested concept.
作者
夏悦馨
方志耕
XIA Yuexin;FANG Zhigeng(College of Economics and Management,Nanjing University of Aeronautics and Astronautics,Nanjing 211100,China;Institute of Grey System,Nanjing University of Aeronautics and Astronautics,Nanjing 211100,China)
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2023年第8期2079-2088,共10页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金(72071111)
南京航空航天大学基本科研业务费资助项目(NP2019104)。
关键词
累积退化
随机冲击
竞争失效过程
随机阈值
变阈值
cumulative degradation
random shock
competing failure process
random threshold
variable threshold
