中文摘要：

利用传递矩阵对汽车吸声材料的吸声特性进行了分析。首先将多层均匀吸声材料进行布置，得到两层吸声材料之间的声压与介质中质点的振动速度关系。然后将实验材料钢板前面的第三层与第i＋1层吸声材料分离开来单独考虑，得到多层吸声材料的吸声系数计算公式。最后对三层不同厚度的均匀吸声材料之间的吸声系数进行了实例计算和实验测量，验证了传递矩阵计算所得的吸声系数是正确的。

英文摘要：

This paper analyzed the sound absorption characteristics of automobile sound absorption materials with the transfer matrix. Firstly, the multilayer uniform sound absorption materials were decorated, and the sound pressure and normal particle vibration velocity relationship between two lay ers of sound materials were obtained. Then the i layer and the i2cl layer of sound absorption materi als in front of the experimental material steel plate were considered separately, and the acoustic im pedance ratio between two layers was obtained. Thus, the sound absorption coefficient calculation for mula of multilayer sound absorption materials would be given. Finally, instances calculation and ex perimental measurements of the sound absorption coefficient among the uniform sound absorption ma terials of three different thicknesses were carried out, and the correctness of the sound absorption co efficient was verified, which was studied from the transfer matrix characteristic calculation of automo bile multilayer sound absorption materials. A theoretical basis for transfer matrix characteristics of the multilayer sound absorption materials will be provided.