摘要
应用边界元(BEM)和有限元(FEM)耦合方法对平顶有肋柱壳在声波轴向入射时的低频反向散射特性和振动位移状态进行了计算,对结果作了分析。并且实验测量了与计算相同的三个目标的低频反向散射特性,同计算结果相比较,结果基本一致,理论和实验结果均证明了肋骨存在对回波强度的影响,改变了原有振动系统的振动分布,使得散射谐振发生变化。
Low frequency scattering from cylindrical shells are calculated using the coupled finite element （FEM）/ boundary element （BEM） method, and the sound backscattering measured over a ka range of 2-4. Effects of the rib on scattering echoes are analyzed. The experimental data approximately coincide with the numerical results. The result indicates that the object structure has important effect on the resonance and TS distribution over frequencies.
出处
《声学技术》
CSCD
北大核心
2007年第1期36-39,共4页
Technical Acoustics
基金
国防科技重点实验室基金项目(51446060103ZK6603)
关键词
低频
声散射
结构
low frequency
acoustic scattering
structure
