某型导弹舱段连接结构强度可靠性灵敏度分析  

Analysis on strength reliability and parameter sensitivity of a missile cabin structure

作　　者：周红[1] 刘永寿[1] 高宗战[1] 岳珠峰[1] 

机构地区：[1]西北工业大学工程力学系,西安710129

出　　处：《固体火箭技术》2011年第6期768-771,共4页Journal of Solid Rocket Technology

基　　金：高等学校学科创新引智计划项目(B07050);西北工业大学研究生创业种子基金项目(Z2011072)

摘　　要：研究了某型导弹舱段连接结构强度的可靠性。为进行可靠性分析,首先采用非线性接触有限元法对螺钉连接舱段结构进行确定性分析,以校核结构的强度是否满足设计要求;其次,考虑了加工、设计公差造成实际尺寸的分散性,将螺钉位置和舱段厚度作为随机变量,结合确定性分析方法,引入四阶矩法对舱段连接结构进行了强度可靠性分析以及随机变量灵敏度分析。分析结果表明,在充分考虑随机变量的分散性时,舱段结构强度失效概率为1.18×10-3;灵敏度分析发现,舱段连接段的厚度是影响舱段结构强度可靠性的主要因素。The strength reliability and parameter sensitivity of a missile cabin structure are investigated. In order to check strength of the missile cabin structure, stress distribution is analyzed by nonlinear contact finite element method. Owing to machining deviation and design tolerance, the missile cabin structure is always with some uncertain factors. The bolt location and thickness of cabin are expressed as random variables. Based on the certainty analysis method, the strength reliability and sensitivity of the missile cabin structure are analyzed by the fourth moment method. The reliability analysis shows that the strength failure probability of missile cabin structure is 1.18 × 10^-3and the results of sensitivity analysis show that the thickness of cabin is a main factor which affects the strength reliability of cabin structure.

关 键 词：导弹舱段 非线性接触 四阶矩法 灵敏度 

分 类 号：V421.3[航空宇航科学与技术—飞行器设计]