Abstract: There is a large amount of air in the car, which can be divided into air volume units of different sizes. With the development of science and technology, noise reduction of different degrees of each cavity unit will be realized in the future. Therefore, this paper studies the noise reduction of local space in the car, imports the co-driver seat model into the finite element software HyperMesh, divides local cavity around the seat, and establishes a sound-structure coupling model.When different excitation conditions are applied to the acoustic cavity unit, the sound pressure response of two kinds of artificial leather materials, polyurethane (PUR) and polyvinyl chloride (PVC), are analyzed and compared, which provided a certain reference for noise reduction in the car.

Key words: Acoustic cavity unit; Sound-structure coupling; Skin material; Noise reduction effect

摘要： 因车内存在大量的空气，故可将其划分为不同大小的空气体积单元。随着科技的发展， 未来将实现每个声腔单元不同程度的降噪，文章在研究车内局部空间的降噪时，将副驾驶座 椅模型导入到有限元软件 HyperMesh 中，并在座椅周围划分局部声腔，建立声固耦合模型， 对该声腔单元施加不同类型的激励工况时，分析比较两种人造革材料聚氨酯（PUR）和聚氯 乙烯（PVC）为座椅蒙皮材料时的声压响应，为车内降噪提供了一定的参考。

关键词: 声腔单元；声固耦合；蒙皮材料；降噪效果