Analysis on contact reliability of missile suspension and rail based on high moment

Abstract

The strength reliability and parameter sensitivity of a missile suspension under the condition of assembling with rail were studied.Firstly,finite element redevelopment technology was performed to build parametric models of missile suspension and rails for checking whether the structure strength met the design requirements.Secondly,considering the machining deviation and design tolerances may cause the stochastically of actual dimensions,the structure dimensions of key parts were expressed by random variables.Combining finite element parametric method and the fourth moment reliability method,the strength reliability and parameter sensitivity analysis of the missile suspension structure were performed.According to the reliability analysis results,the missile suspension failure probability 0.000 607 was obtained.The results of sensitivity analysis show that the ear length and ear pieces medial thickness are the main influencing factors of the hanging structural strength;the dimension error is the main reason leading to dispersion of strength.Finally,compared with other reliability methods,the analysis method proposed in this paper possesses higher accuracy and efficiency,which is especially fit for the reliability analysis of complex structures.