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Shock and Vibration
Volume 1, Issue 1, Pages 55-58
http://dx.doi.org/10.3233/SAV-1993-1107

Specification of Modal Participation Factors in Acoustic Scattering Problems

M. Ettouney,1 R. Daddazio,1 and F. DiMaggio2

1Weidlinger Associates, Inc., Applied Science Division, 333 Seventh Avenue, New York, NY 10001, USA
2Columbia University, Department of Civil Engineering and Engineering Mechanics, New York, NY 10027, USA

Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Using the wet modes of a submerged structure as expansion functions, it is shown how the scattered far-field pressures induced by an incident harmonic wave may be modified in a prescribed manner. This is done by applying forces directly to the structural surface, which superposes a radiated pressure field on the scattered one. By appropriate choice of the applied nodal forces, modal participation factors associated with any combination of mode shapes may be controlled. The method is illustrated by a numerical example.