A new analysis of sound fields by boundary integral equation and its applciations

摘要

The computer simulation is the useful tool to develop the active ocntorl ysstme.But when one attempt to put the system to poracticla use,it would be necessary to consider the influence of sound fidelds in usch ismulatin.Up to date.The acousticla chanracteisitcs of the contorlled space have mainly been provided as pure delay by assumign control in free fields or as actual vaues by meaurements.In measurements,however,the meaured values are influenced by measuring ondtions,precisions,and mehtods reamrkably,then the repeatabilty o the siulation is not kept completely.A way to avioid this prolbem is to introduce the osund field analysis to the simultion.Here it is important to consider teh wave motion characteirsitics of sound inn the analysis mehtod,because the dominant frequency range is usually low in the activ control of sound.