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Analysis of Sound Transmission Loss on Infinite Double-panel Partition

机译：无限双面板隔板上的传声损失分析

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摘要

Based on two panels structure model, the theoretical processes of calculating the sound transmission loss (STL) are detailed by wave transfer method (WTM) and structural bending wave method (BWM), respectively. When the acoustic wave is vertically incident and obliquely incident, the sound transmission loss of infinite two-plate structure can be calculated by WTM and BWM, respectively. The calculation formulas and physical meanings of resonance frequency points are given, including the frequencies of “mass-air-mass”, standing wave, and panel coincidence. Through some comparisons of STL curves and analysis about the trends of two curves, the advantages and disadvantages of WTM and BWM are pointed out. The equivalent conditions of WTM and BWM are derived, in the case that the acoustic wave is vertically incident on the thin plate structure. When the structure and acoustic wave satisfy the equivalent condition, the STL curves provided by WTM and BWM are consistent with each other under vertically incident wave; when plane acoustic wave is obliquely incident on whole structure, it becomes inaccurate for the calculated result by WTM, while it is still reliable for the results by BWM. By changing the plate thickness, air layer thickness and elevation angle of incident acoustic wave, some influences created by these factors on STL of infinite two-plate structure are analyzed.
机译：基于两个面板结​​构模型，分别通过波传递法（WTM）和结构弯曲波法（BWM）详细介绍了计算声传输损耗（STL）的理论过程。当声波垂直入射和倾斜入射时，无限二板结构的传声损耗可以分别通过WTM和BWM计算。给出了共振频率点的计算公式和物理含义，包括“质量-空气-质量”，驻波和面板重合的频率。通过对STL曲线的比较和对两条曲线趋势的分析，指出了WTM和BWM的优缺点。在声波垂直入射在薄板结构上的情况下，得出WTM和BWM的等效条件。当结构和声波满足等效条件时，WTM和BWM提供的STL曲线在垂直入射波下彼此一致。当平面声波倾斜入射到整个结构上时，对于WTM的计算结果来说是不准确的，而对于BWM的结果仍然是可靠的。通过改变板厚，空气层厚度和入射声波仰角，分析了这些因素对无限二板结构STL的影响。

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