Transmission Loss Analysis of Seal Based on a Consideration of Compression Load

Abstract:

A nonlinear quasi static analysis on a door seal was carried out to obtain its deformation and stress distribution under different compression ratios. Then the pre stress modal analysis was applied to the deformed seal. To analyze the impacts of pre stress and compression ratio to the transmission loss (TL), the model of which was built by reverberation chamber anechoic chamber method, so that the seal TL could be calculated based on the mode superposition method. The result shows that the pre stress has a great influence on the transmission loss of the low frequency stiffness control area, while the increase of compression ratio will improve the transmission loss of seal effectively within the compression rate of 50%.