Abstract
The computer program CHIEF has been modified to allow the computation of sound radiation from an arbitrary-shaped body where the normal velocity is prescribed on only part of the surface of the body while a locally reacting complex impedance is assumed to cover the remainder of the surface. This impedance can range in value from zero (pressure-release boundary condition) to essentially infinity (rigid boundary condition). Different values of impedance are allowable on different portions of the same surface. Some results of computations of far-field directivity patterns and the radiation impedance loading on simple-shaped radiators with the mixed boundary conditions are presented. [Work sponsored by ONT.]
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