机械零件动态可靠性模型及失效率研究-JournalofNortheastern.pdfVIP

第28卷第11期 东 北 大 学 学 报 ( 自 然 科 学 版 ) Vol28, No. 11 2 00 7 年 11 月 Journal of Northea tern U niver ity( Natural Science) Nov . 2 0 0 7 王 正, 谢里阳, 李 兵 ( , 110004) : , , - , , ; : ; ; ; ; : T B 114. 3; TH 122 : A : 1005-3026( 2007) 11- 1620-04 Time-Dependent Reliability Model and Failure Rate Study of Mechanical Components WA N G Zhe ng , X IE L i-yang , LI B ing ( School of M echanical Engineering Automatio n, Northea tern Univer ity, Shenyang 110004, China. Corre pondent: WA NG Zheng , E-mail: w zneu @ 126. com) Abstract: The characteri tic of the conventional reliability model are analyzed and it i found that they cant reflect well the relation hip between the reliability and f ailure rate of component becau e it involve not only the time but al o the frequency of random loading. The Poi on tocha tic proce i applied to de cribing the loading proce to develop a tim e-dependent reliability model of component con idering the trength deterioration w ith time pa ing, w hich i derived by the tre - trength interference model in combination w ith the probability differential equation. T aking the trength deterioration of component follow ing the exponential rule a an example, how the reliability and the failure rate of component change w ith time i tudied. The re ult how that the reliability of component decrea e w ith time, and the f ailure rate curve of component pre ent all the f eature of the bathtub curve. Key words: reliability model; time-dependent reliability; random load; com ponent reliability ; failure rate