有源激励时水下球壳声辐射相似性研究

基于方程分析法讨论了相似条件的建立过程，并针对畸变后的球壳，调节模型的激励频率，在某种程度上补偿畸变球壳对原型预测得到的偏差。通过理论和计算机仿真研究，结果表明：利用球壳在不同激励频率时声场的不同特性，当球壳厚度半径比不同时，通过对模型激励频率的调节，可以使模型与原型的声场指向性较好的符合，但若使两系统的无量纲声压相符，还需要进行数值比例因子的修正。结果表明，利用调节激励频率的办法，补偿由于模型畸

Similarity Study of Acoustic Radiation of Excited Submerged Spherical Shell

Wediscussed the establishment of similarity conditions based on equation analysis.Byadjusting the excited frequency for the distorted model of spherical shell to someextent,it may compensate the deflection of predicting the behavior of prototype from thetest result of distorted spherical shell. Study results from both theory and computersimulation were shown in the paper. According to the fact that different characteristicsof sound field are displayed with different excited frequency on spherical shell,in thecase of different ratio of spherical shell thickness to radius,the pressure directivity ofthe model can conform to that of the prototype rather well by adjusting the excitedfrequency of the model. Of course the modification of numerical scale factor is required,in order to make the identity of nondimensional pressure of two systems. Experimentalresults show that by adjusting the excited frequency compensating the distortion of soundfield from distorted model is feasible and successful.