This study deals with sound radiation of a vibrating body in a half space. Half space may be formed by a rigid, anechoic or specifically by an impedance surface. The practical application of the impedance surface may be the sound field determination of a machine sitting on a floor, coated with an isolation material, for passive noise control. The study is based on the solution of Helmholtz integral equation by the boundary element method (BEM). A BEM code developed for general vibro-acoustic applications is used for numerical solutions. Examples include sound sources taken from theory and daily life. Some benchmark studies and real life applications are involved.
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