Acoustic-Structural Sensitivity Analysis and Optimism of Car Body Multilayer Panels

Acoustic-structural sensitivity analysis for coupled acoustic-structural systems can be conveniently and quickly used in dynamic modifications of car body panels to reduce interior sound pressure level. In practice, car body panels are multilayered structure which consists of the outside skin, the interior trim, and the air gap or absorbent layer between them. The vibration characteristics and the capability of sound insulation of multilayer panels are very important factors which dominate acoustic response in car cavity. A simplified car body model is made to investigate the effects of multilayer panels on interior sound levels. With the model, the relation between the acoustic response of the cavity and the property of multilayer panels are achieved. The validity of theoretical analysis is verified through a comparison between the experiment and the numerical simulation results. Finally, acoustic-structural sensitivity analysis of car body multilayer panels is evaluated synthetically. The panels’ structure is optimized, and car interior sound level is improved.