Reliability Optimization Design of Side Impact Body Structure

Tan lin1, Li Qinyi1, Chen Yiqing1, Liu Ping2 1. Guang’an Vocational & Technical College, Guang’an 638000; 2. Southwest Jiaotong University, Chengdu 610000） （ Abstract In order to study the effect which body- side parts have on side- impact safety, the researchers select【 】Column B’s inner panel, stiffening plate, inner door panel and the thickness of side door beams as design variables, combine the experimental design, response surface model, reliability theory and optimization algorithm, and then establish a mathematical model of the car side impact Column B and the door reliability optimization design. After making the optimal reliability design of Column B and the car door, the researchers compare the results with that of deterministic optimization design. The comparison shows that both optimizations can improve the side impact safety, but the deterministic optimization will make the maximum intrusion speed of Column B close to the constrained boundary, in contrast to the deterministic optimization, the reliability optimization will decrease the maximum intrusion speed of Column B, increase the energy absorption, reduce the door’s maximum intrusion speed by 3.1% , ensure the output response values away from the constrained boundary values, and raise the reliability degree of Column B and car door’s maximum intrusion speed by 26.6% and 10.5% respectively, thus meeting the reliability design requirement. Therefore, the results of optimal reliability design can better meet the requirements of crashworthiness of car side impact and reliability. Key words: Side impact, Side body structure, Design of experiment, Response surface, Reliability optimization