考虑载荷统计方法的可靠度计算模型  

Reliability Model Considering Statistic Method of Loading

作　　者：高鹏[1] 谢里阳[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2010年第2期249-252,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50775030);国家重点基础研究发展计划项目(2006CB605005)

摘　　要：通过分析载荷概率密度函数的统计方法,提出了载荷的横向分布和纵向分布概念,并提出对应的可靠度计算模型.由于工程上通常容易得到载荷的横向概率密度函数,因此着重研究了已知载荷横向分布时零件可靠度随载荷作用次数的关系,建立了相应的可靠度近似计算模型.此外,假设载荷出现次数服从泊松分布,利用等效载荷得到了考虑强度退化时零件可靠度与作用时间的关系.研究表明,对于相同的概率密度函数,当统计方法不同时,可靠度计算结果相差较大,因此,应该根据统计方法选择相应的可靠度计算模型.Analyzing the statistical methods of probability density function of loading, the relevant transverse and longitudinal load distributions are defined with the reliability models proposed. Because the transverse distribution is usually obtained easily, the relationship between reliability of a part and loading frequency is emphatically studied when the transverse distribution is known, then a model is developed to calculate reliability. In addition, assuming that the loading process is a Poisson process, the relationship between reliability and service time is analyzed considering strength degradation and using the equivalent loading. The results show that for the same probability density function of loading there are some quite different values of reliability if using different statistical methods. Therefore, the reliability model should be chosen correspondingly according to the statistical method to be used.

关 键 词：可靠度 横向分布 纵向分布 载荷 统计方法 

分 类 号：TH122[机械工程—机械设计及理论] TB114.3[理学—概率论与数理统计]