Author(s)

K.K. Chan & P.A. Heng

Abstract

Acoustic scattering from a three-dimensional object with frequency-dependent reflection surface is solved using time-domain boundary element method. Frequency response of the reflective surface is characterized by a finite im- pulse response in time domain. This time domain method is not so trivial as its frequency counterpart. To accomplish this, the total excess pressure on the surface is divided into an incident pressure and a reflected pressure and hence the finite impulse response can be added into the formulation. A Robin-type boundary condition is used to help solving the problem. For a plane wave scattering from a sphere, the results from the two domains match very well. 1 Introduction Most of the previous researches in acoustic simula

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