结构振动模态声辐射理论及试验研究

从结构振动声能辐射的一般规律、自由声场的能量分布及传送方式和结构振动模态原理入手，对结构振动模态的声能辐射与外加激励，模态参数间的关系进行了理论推导和研究。得出，当激振点不变时，激振力级的变化与振动模态加射的平均声压级成线性关系；若激振力不变，振动模态辐射的平均声压级与模态振型元素级成线性关系。对以上结果在自由声场中试验验证，理论值与实测值基本相符。

A Study of the Theory and Experiment of Sound Radiation Produced by Modal Vibration

The present paper presents the relation between sound radiation of physical construction and its modal vibration. When the exciting force was constant the average level of sound radiation produced by modal vibration has a linear relationship with the level of mode shapes. With fixed exciting point the average level is a linear function to the level of excitation force. Finally, the experiment demonstrates that the difference between the measured values of the average level and the calculated values based on above theoretical results are very small.