AN ANALYSIS OF ACOUSTICAL SCATTERING FROM ELASTIC OBSTACLES BY FINITE AND BOUNDARY ELEMENT COMBINATION APPROACH

A method combining boundary and finite element approaches as well as modal analysis to solve the acoustical scattering from elastic obstacle in infinite fluid is described. An elastic cylinder with finite length immersed in water is chosen as an example for numerical demonstration. The computed frequency response and direction pattern of the backscattering target strength of the cylinder are conformable to those measured.     

有限元-积分方程法解弹性目标声散射

本文说明了用有限元-积分方程求解弹性目标声散射的一般方法,并在其中引入了模态分析。此法可用于任意形状的弹性目标,并可提供较清晰的物理图象,便于分析目标弹性振动对散射场的影响。文中给出了水中钢柱在平面波场中的声散射的计算和测量结果的比较。