Unlike the audio sound generated by traditional sources, the directivity of that generated by a parametric array loudspeaker (pal) deteriorates significantly after passing through a thin partition. To study this phenomenon, the pal radiation model based on the Westervelt equation, and the plane wave expansion method are used to calculate the sound fields behind a sheet of aluminum foil and a porous material blanket under the quasi-linear assumption, where the paraxial approximation is assumed only for ultrasonic waves. The audio sounds generated by a point monopole and a traditional directional source are presented for comparison. Both simulation and experiment results show that the transmitted sound from a pal behind the thin partition is small and less focused on the radiation axis because most of the ultrasounds forming the directivity of the pal is blocked by the thin partition which has little effect on the traditional audio sources.

中文翻译：

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参数阵列扬声器生成的音频声音的薄分区的插入损耗。

与传统来源产生的音频声音不同，参数阵列扬声器（pal）产生的声音的方向性在穿过薄壁后会大大恶化。为了研究这种现象，在准线性假设下，利用基于Westervelt方程的pal辐射模型和平面波扩展方法来计算铝箔片和多孔材料毯后面的声场，其中近轴近似仅假定用于超声波。提出了由点单极子和传统定向源生成的音频声音进行比较。仿真和实验结果均表明朋友传递的声音。薄隔板的后面很小，并且很少集中在辐射轴上，这是因为形成pal方向性的大多数超声波都被薄隔板阻挡了，这对传统音频源几乎没有影响。