Squeak and Rattle Analysis of Automotive Interiors Considering Contact Nonlinearity

In order to improve the squeak and rattle (S&R) performance level of automotive interiors, the contact nonlinear characteristics of structural components need to be considered when performing interior noise analysis. The finite element model of S&R analysis of the interior assembly is built, and the time-domain vibration characteristics of the contact points between the interior panels are analyzed by applying external forced excitation. The interaction force between contact points is obtained according to the contact equivalent model between interior materials. The external excitation and internal interaction force are analyzed as the total excitation to obtain the response results. Through experimental verification, compared with the S&R performance division method, the analysis results are consistent with the test results. Based on this model, S&R risk optimization is carried out, and the risk level is significantly reduced. The research shows that the level of S&R performance can be accurately predicted by considering the nonlinear contact problem of the contact point in the S&R analysis of interior assembly, which has important guiding significance for the forward development and optimization design of automobile S&R performance.