车身结构模型修改的方法研究

ombine the element strain energy density method with BIW structure, a relative sensitivity method called strain energy density and mass sensitivity ratios is put forward. Base on the higher stiffness and lower weight modification requests of thin-walled members of BIW, relative sensitivity is calculated. Compare with the results, the components which have bigger numerical value should be increased thickness, whereas decreased thickness. According to the orientation of modification from relative sensitivity analysis, three different modification projects with different targets: high stiffness project, light weight project and synthetic project are proposed. The results comparison reveals that synthetic project is the most suitable modification to the requests and it is received a satisfactory result. It also shows that exactitude and effectiveness of this relative sensitivity method.