Study on rattle and squeak in automobile instrument panel at different temperature based on CAE

TAN Ting-ting1,2, DU Jian-ke1, LI Hong-liang2, LI Qi2
(1.School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China;
2.China Automotive Technology and Research Center Co., Ltd., Tianjin 300300, China)

Abstract: Aiming at the risks of squeak and rattle in instrument panel(IP) at different temperature， the quasistatic tensile test was carried out on the main materials of the IP. The modulus of elasticity and Poissons ratio of the materials at -30℃, 10 ℃, 30 ℃and 50 ℃ were obtained by digital image correlation method, which provided material parameters for the finite element modeling of the IP. The risks of rattle and squeak priority number of the material pairs and the impulse rate between the two materials were measured by the Ziegler SSP-04 tester. The relative displacement of adjacent components was calculated with transient response analysis by using Optistruct. According to relative displacement of single impulse and the designed gap between two adjacent components, the risks of squeak and rattle at different temperature were identified, and the vehicle verification experiment was carried out. The results indicate that the higher the temperature is, the greater the risk of rattle and squeak of adjacent parts is. The two trends of the simulation results and the experimental values are basically consistent. It shows that the simulation method can be used to analyze the rattle and squeak of the IP during the early design stage of the vehicle development.
Key words: the quasi-static tensile test; risk priority number (RPN); relative displacement; squeak; rattle；digital image correlation (DIC)