Transform Potential-Theoretic Method for Acoustic Radiation from Structures
Publication: Journal of Aerospace Engineering
Volume 18, Issue 1
Abstract
This paper presents further development in a new time-domain computational technique developed for the determination of far-field acoustic radiation. This method, referred to as the transform potential-theoretic (TPT) method, solves linear time-dependent wave propagation problems in an unbounded medium, combining techniques involving numerical transforms/inverse transforms and potential theory. The end result is a robust procedure that is accurate and computationally efficient. The TPT technique is meshless, yet it can handle arbitrary geometries for the acoustic source. The validity of the procedure is demonstrated for the case of an acoustic wave propagation from a two-dimensional bounded surface embedded in a uniform flow. Both direct simulations as well as the current method(s) are compared. The single-layer potential theory based TPT method required fewer points on the boundary than the double-layer potential theory based TPT and performs better than direct simulation in high subsonic Mach number flows . The times required to compute these solutions were more than two orders of magnitude lower than direct simulation.
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Acknowledgments
The work of the first writer was supported by grants from the National Aeronautics and Space Administration Glenn Research Center (Grant No. NAG3-1282) and the National Science Foundation (Grant No. ANI-981807).
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© 2005 ASCE.
History
Received: Jun 3, 2003
Accepted: Jul 7, 2004
Published online: Jan 1, 2005
Published in print: Jan 2005
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