Abstract
The scattered field on the boundary of an insonified hard or soft cylinder of arbitrary shape (CAS) is obtained in approximate manner by using explicit forward scattering solutions of insonified impenetrable circular cylinders (CC) whose radii vary with location on the boundary of the CAS. This so-called intersecting canonical body approximation (ICBA) is employed in the boundary integral representation in order to determine field functions at arbitrary points on or outside the scattering body. The approximation is evaluated in the near and farfield zone by comparison with rigorous solutions obtained from a boundary-integral equation scheme. The ICBA is shown to give results that are of better quality in the low frequency and resonance regions and of equivalent quality in the high frequency region as compared with the approximate solution deriving from the oft employed Kirchhoff ansatz of the surface field.
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