ACOUSTIC REFLECTION FROM A BAFFLED ELASTIC/PIEZOELECTRIC PLATE

<正> A finite difference/boundary integral procedure to determine the acoustic reflected pressurefrom a fluid-loaded bi-laminated plate is described.The bi-laminate is composed of a piezoelectric layer andan elastic layer in contact with the fluid,and is held by an acoustically hard baffle.In the numerical model,the fluid pressure at fluid/solid interface is replaced by a continuum of point sources weighted by the normalacceleration of the elastic plate,and the governing equation system is solved in the solid domain.With thenormal acceleration found,the reflected pressure in the fluid is determined by an integral expression involv-ing the Green's function.It is demonstrated that an appropriate applied voltage potential across the piezoelec-tric layer has the effect of cancelling either the reflected or scattered pressure of the plate at any chosen fieldpoints in the fluid.