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Sound transmission loss characteristics of single corrugated panel

This paper employs a modal expansion method to investigate the sound transmission loss 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.