考虑声衰减时抗性消声器的传递矩阵

本文研究具有声能耗散时抗性消声器的传递矩阵。声能衰减的主要原因是(1)管壁的粘滞性与热传导,(2)管壁的漏声,(3)存在气流时管道载面突变处的声能损耗。文中导出包括声能衰减的传递矩阵并加以讨论,实验上采用直接堵塞法,测得的矩阵元素值与理论分析符合良好。

Transmission Matrix of Mufflers with Sound Energy Dissipation

The sound propagation in reactive mufflers with sound energy dissipation has been discussed in this paper. The sound attenuation includes: (1) viscous damping and thermal conduction of pipe walls; (2) leakage of sound; (3) energy dissipation caused by sudden change of cross section. It is shown that the transmission matrix of mufflers with sound attenuation is represented by adding a matrix which can be depended on anattenuation coefficient. The matrix parameters are expressed when the above kinds of attenuations are considered respectively. Experiments were conducted by blocking at certain stations in acoustic system. Good agreement between experimental and theoretical results is illustrated.