J4 ›› 2007, Vol. 18 ›› Issue (22): 0-2765.

• 机械科学 •    

起重臂弯曲和扭转刚度的可靠性灵敏度

袁 涛1;张义民2;薛玉春1;贺向东2   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-11-25 发布日期:2007-11-25

Yuan Tao1;Zhang Yimin2;Xue Yuchun1;He Xiangdong2   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-11-25 Published:2007-11-25

摘要:

讨论了起重臂在弯曲刚度和扭转刚度失效模式下的可靠性灵敏度设计问题。推导出两种失效模式下结构的系统可靠性灵敏度公式;解决了不同失效模式间基本随机变量不一致的问题;编写了相应的计算机程序,能够迅速准确地获得结构的可靠性对基本变量均值、方差以及变量间相关系数的灵敏度信息。

关键词: 可靠性; 摄动法; 失效模式; 灵敏度; 起重臂; 工字梁

Abstract:

Reliability sensitivity of jib with bending and torsion stiffness failure modes was proposed. Sensitivity formulas of system reliability of structure with two failure modes were deduced. The problem of inconsistency of basic random variables between different failure modes was resolved. The computer procedure was programmed, through which the sensitivity information of structure reliability to mean values, variances and correlation coefficients of basic variables can be quickly and exactly obtained.

Key words: reliability, perturbation method, failure mode, sensitivity, jib, I-shaped cantilever

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