波纹板的隔声特性研究

应用模态展开方法研究单层正弦波纹板在简支边界条件下的声传递损失特性。首先把正弦波纹板等效为正交各向异性平板，建立正交各向异性平板的声振方程。基于同一模态函数基，利用Galerkin方法由速度连续条件求得系统的声振响应，得到波纹板结构声传递损失的解析表达式。通过计算结果与已有的实验数据比较，表明文中方法比波传递方法能够更好地预测波纹板结构的中低频段声传递损失特性。最后研究波纹板结构参数（包括板厚、入射角、方位角以及损耗因子等）对隔声特性的影响。

Study on Sound Insulation Characteristics of a Single Corrugated Panel

This paper employs a modal expansion method to investigate the sound insulation property of single sinusoidal corrugated panel with the simply supported boundary condition. Firstly, the corrugated panel is equivalent to an orthotropic flat panel. The governing equation of vibroacoustic coupling system consisting of the orthotropic flat panel and the incident sound wave is built. Based on the same modal function base, the governing equation of system is then solved according to the continuity condition of velocity at the air-panel interface using the Galerkin method. The present method is examined against the existing experimental data. The results show that the predicted sound transmission loss by the present method has a good agreement with the measured one in the concerned frequency range. Especially, the present method yields much smaller prediction errors than the classic wave approach in low-middle frequency range. Lastly, the influences of several key parameters (panel thickness, elevation angle, azimuth angle and loss factor) on the sound insulation capability of single corrugated panel are systematically analyzed.