考虑声固耦合的充液管道消声器声学特性分析

Analysis of Acoustic Characteristics of Liquid-filled Pipe Mufflers Considering Acoustic-structure Coupling

声固耦合效应是影响充液管道消声器声学性能的一个重要因素,使用有限元法研究充水管道消声器的声学特性,将消声器腔壁和穿孔管壁作为弹性板,考虑声固耦合效应的影响,计算简单膨胀腔水消声器、穿孔板与穿孔管水消声器的传递损失。进一步研究弹性壁的壁厚和材质、穿孔板的结构参数对水消声器声学特性的影响规律,通过对比得到消声器弹性腔壁和弹性穿孔管壁对穿孔管水消声器声学特性的影响贡献度。

Acoustic-structure coupling effect is an important factor that affects water-filled pipe muffler’s acoustic performance.In this paper,finite element method is used to study the acoustic characteristics of the water-filled pipe muffler.The cavity wall and the perforated pipe wall of the muffler are simplified as elastic plates.The effect of acoustic-structure coupling is considered when calculating the transmission losses of simple expansion cavity,perforated plate and perforated pipe of the water muffler.The effects of the wall thickness and material property of the elastic wall and the structural parameters of the perforated plate on the acoustic characteristics of the water muffler are further studied.By comparing the elastic cavity wall of the muffler with the elastic perforated pipe wall,contributions of both to the acoustic characteristics of the perforated pipe water muffler are obtained.