摘要
考虑到机械产品在时间历程上的时变性,引入不确定性的随机变量表达产品各个参数的不确定性,引入不确定性的随机变量表达形式代表产品各参数在使用过程中的不确定因素。利用带漂移参数的Wiener过程描述强度退化过程,以应力干涉模型为可靠性模型基础,结合可靠性灵敏度设计方法,采用一次二阶矩技术得出研究对象可靠度及可靠性灵敏度在强度退化过程中随时间变化的规律。文章以螺栓为具体算例对所提出的方法进行研究,推导得出螺栓在强度退化情况下的可靠度及灵敏度的计算结果,并用Monte-Carlo方法对计算结果进行验证。
Considering the time-varying reliability of mechanical products on the time course,using random variables to describe the product each parameter uncertainty,Wiener process with drift parameters is used to describe strength degradation process,on the basis of stress interference model,combined with the reliability sensitivity design method,using a second-order moment technical reliability and reliability sensitivity in the process of strength degradation of the specific law of change over time.Based on bolt concrete numerical example to validate the proposed method,using a second moment method for calculation,derived the bolts under the condition of strength degradation of reliability and reliability sensitivity analysis,and Monte-Carlo method compared with the result of calculation,at the same time,according to the analysis results obtained improve the effective measures for reliability design of bolt.
作者
李臻
尚伟
LI Zhen;SHANG Wei(Department of Automobile Engineering,Sichuan Vocational and Technical College of Communications,Chengdu 611130,China;School of Mechanical Engineering and Automation,Northeastern University,Shenyang 110819,China)
出处
《组合机床与自动化加工技术》
北大核心
2018年第7期22-24,30,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
四川省高校校企联合汽车检测应用技术创新基地建设项目(四川省教育厅﹝2012﹞397号
2012-2016年)
关键词
可靠性灵敏度
Wiener随机过程
强度退化
一次二阶矩技术
reliability sensitivity
wiener random process
strength degradation
the one time and second moment method
