Abstract
This paper is concerned with the use of integral equation methods in numerical calculations of exterior sound fields around scattering objects. The objects investigated are a rigid body with edges and vertices, a rigid plate, and an absorbing body. For each case integral equation solutions are developed, derived from Green's formula, and its normal derivative form, and the numerical results are found to agree with measurements. The method of limiting conductance is tested and it is found that the normal derivative form results show better agreement with measurements than those from the ordinary formulation. Other problems which arose in the calculations are also considered: e.g., evaluation of the normal derivatives of the double layer potential, treatment of edges and vertices of three dimensional objects, and the relative merits of the two formulations in practical applications.
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