FINITE DIFFERENCE ANALYSIS OF ACOUSTIC REFLECTION AND RADIATION FROM FLUID-LOADED PLATES

• 来源期刊: 力学学报（英文版）
• 年，卷（期）: 2003,（2）
• 页码范围: 140-146
• 页数: 7页
• 语种: 英文

摘要

A finite difference/boundary integral procedure to determine the acoustic reflected pressure from a fluid-loaded bi-laminate plate is described. The bi-laminate is composed of a piezoelectric layer and an elastic layer in contact with the fluid. The plate is either of finite length and held at its two ends in an acoustically hard baffle or of infinite length with periodically etched electrodes.In the numerical model, the fluid pressure at fluid/solid interface is replaced by a continuum of point sources weighted by the normal acceleration of the elastic plate, and the governing equation system is solved in the solid domain. It is demonstrated that an appropriate applied voltage potential across the baffled piezoelectric layer has the effect of cancelling the reflected pressure at any chosen field points,and a piecewise constant voltage potential with properly chosen amplitude and phase in the periodic structure has the effect of cancelling the fundamental propagating mode of the reflected waves.