NONAXISYMMETRIC ACOUSTIC RADIATION AND SCATTERING FROM RIGID BODIES OF REVOLUTION USING THE SURFACE VARIATIONAL PRINCIPLE

The surface variational principle (SVP), which represents the surface response as a series of basis functions spanning the entire surface, p rovides a global description of acoustic fluid-structure interaction t hat has many of the benefits associated with analytical methods. This paper describes the extension of SVP to model the interaction between the velocity and pressure on the surface of an axisymmetric body subje cted to nonaxisymmetric excitation. Problems addressed are radiation d ue to arbitrary rigid body motion, and scattering associated with arbi trary incidence of a plane wave on a stationary rigid body. Numerical results are presented for flat-ended and hemi-capped cylinders. These results are compared to those obtained from the CHIEF-88 and SHIP-92 c omputer codes. The convergence properties of SVP are examined in detai l, particularly for its requirements when ka is in the upper part of t he mid-frequency range.