考虑压缩负荷的密封条传递损失分析

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

摘要:

对某车门密封条进行非线性准静态分析，获取各压缩率下的密封条变形及应力分布情况.对变形后的密封条进行预应力模态分析.根据混响室 消声室法建立传递损失分析模型，基于模态叠加法计算密封条传递损失，分析预应力、压缩率对传递损失的影响.研究结果表明，预应力的存在对于低频刚度控制区域的传递损失影响较大，在压缩率50%以内，压缩率的增加能够有效地提高密封条的传递损失.

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%.