摘要
选用目标表面势函数为变量，结合弹性边界条件，给出了水中弹性球瞬态声散射的时域积分方程法数值计算公式．研究了时域积分方程法在实际计算中随时间步进解呈发散趋势的问题，并采用时域低通滤波技术，基本克服了实际计算中解发散问题．计算了高斯形脉冲入射下弹性铝球的无量纲反向散射声压，并和由频域的Ｒａｙｌｅｉｇｈ简正级数解与入射波的频谱的乘积作反变换得到的精确解做了比较。
It selected object surface potential as variable, using the time domain integral equation method with elastic boundary conditions, gave out the explicit numerical computation approach. In the marching on in time computation, instability was one of the big problems. Resorted to the time domain finite impulse filtering skill, a stable result was obtained. The result for an aluminum sphere with gaussian pulse incident wave was compared to the theory value obtained by inverse Fourier transform from the product of Rayleigh series with incident wave in the frequency domain, which shows a good agreement.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
1999年第3期354-356,共3页
Journal of Shanghai Jiaotong University
基金
国防科工委基金资
关键词
水声学
弹性目标
瞬态声散射
声散射
时域数值解
underwater acoustics
elastic objects
transient acoustic scattering
STIE method
