振动加筋板的声辐射性能研究

The Round Radiation of a Vibrating Rectangular Stiffened Thin Plate

推导点简谐力激励下加筋矩形板的平均声辐射效率计算公式并进行了数值仿真,分析结构参数对加筋板平均辐射效率的影响规律。研究结果表明:在点简谐力激励下,四边简支加筋矩形板的平均辐射效率等于各阶模态辐射效率关于其均方振速的加权平均值;中高频段,加筋矩形板筋条高度越高、筋宽越宽、筋间距越小、材质刚度越大,其平均声辐射效率越大。

The formula for calculating the average acoustic radiation efficiency of the reinforced rectangular plate under the point harmonic force excitation is derived and the numerical simulation is carried out to analyze the influence of structural parameters on the average acoustic radiation efficiency of the reinforced rectangular plate. The results show that the average radiation efficiency of the four-sided simply supported stiffened rectangular plate is equal to the weighted average value of the radiation efficiency of each mode with respect to its mean square vibration under the point harmonic excitation. In the middle and high frequency band,the higher the bar height, the wider the bar width, the smaller the bar spacing and the larger the material stiffness of the reinforced rectangular plate, the higher the average acoustic radiation efficiency.