界面声散射数值模拟中的突变边界处理及有效性分析

Treatment and effectiveness analysis of sudden change boundary in sound scattering simulation

利用在边界突变点处设置两个速度值的方法,解决界面声散射数值模拟中的阻抗突变边界的积分奇异性问题。同时把界面对入射声音的响应局限在声散射方面,仅关心散射声场的声压方向性分布而不考虑吸声效果,可以通过边界元法得到较准确的界面散射极响应图。精确理论解和实验分析表明该处理方法在界面散射的预测中是有效的。

Setting two velocities at a sudden change point to solve the integral singularity problem of the boundaries with sudden change impedances is very common in the numerical simulation of the sound scattering from discontinuous interfaces. If only considering the sound scattering distribution and ignoring absorption, an accurate polar response chart will be achieved by using boundary element method. Precise theoretical solution and experimental analysis show that this processing method is effective in the prediction of sound scattering from diffusers.