Study of boundary conditions and parameters effects on TL of the automobile door sealing system

As the car drives at high speeds, wind noise becomes the main noise and can transfer through the silts or channels on the automotive body surface. With good insulation performance, automotive door sealing system can reduce the vehicle interior wind noise so as to improve the interior speech intelligibility. In this paper, a 3D finite model of the automotive door sealing system, which contains the channel between the automotive door and the body frame, is built to simulate its nonlinear contact and compression before hybrid FE-SEA model is used to predict the transmission loss (TL) of the door sealing system. The different boundary conditions, i.e. bounded freedoms and frictional boundary, and the compression condition are then verified to have an influence on the TL of the sealing system. Taking the frictional boundary condition and the compression condition into consideration, three different uniaxial tensile test data of the super-elastic sealing strips are used to evaluate the effect of the elastic modulus on the TL and the effect of the thickness for the seal strip on the TL is also studied. Finally a good automotive sealing system with improved TL is obtained.