Abstract From:
Kenneth A. Cunefare, W. Steve Shepard Jr., and Jerry H. Ginsberg, "Spectral techniques for assessing critical scales in models of fluid loaded structures," Proc. 15th International Congress on Acoustics, 4, pp. 405-408 (1995).
The level of detail required for accurate structural acoustic modeling of fluid loaded structures remains an issue of significant debate. Analytic solutions are rarely available, and discrete numerical solutions are typically too complex and introduce their own explicit scales. However, the wavenumber-based formulation of the surface variational principle describes the surface pressure and displacement as a comparatively small set of interacting waves. Using spectral methods to represent structural attachment features in the SVP provides the means to introduce, control, and investigate features at differing scales. The spectral technique uses the same wave-number based expansion for the physical representation of the structural feature as is used to represent the pressure and displacement. We present here this technique for assessing the critical resolution scales for a fluid loaded two-dimensional plate. For attachments and internal features, we consider a wave bearing plate elastically suspended at a number of points. We then represent successive stages in refinement of the scale to which a model describes elastic effects through the use of a series expansion. The excitation applied to the plate is taken as a concentrated harmonic force. With the excitation held fixed, the influence of each spectral component of the feature distribution on the surface response and radiated power are assessed.
This research considers the acoustic radiation from a plate system that contains a wave-bearing structure suspended by springs of a certain scale. The scale of the spring elements is varied and the changes in the structural-acoustic response are investigated