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transient difference solutions of the inhomogeneous wave equation - simulation of the green's functionA time-dependent finite difference formulation to the inhomogeneous wave equation is derived for plane wave propagation with harmonic noise sources. The difference equation and boundary conditions are developed along with the techniques to simulate the Dirac delta function associated with a concentrated noise source. Example calculations are presented for the Green's function and distributed noise sources. For the example considered, the desired Fourier transformed acoustic pressures are determined from the transient pressures by use of a ramping function and an integration technique, both of which eliminates the nonharmonic pressure associated with the initial transient.
Document ID
19830044686
Document Type
Conference Paper
Authors
Baumeister, K. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1983
Subject Category
ACOUSTICS
Report/Patent Number
AIAA PAPER 83-0667
Meeting Information
American Institute of Aeronatuics and Astronautics, Aeroacoustics Conference(Atlanta, GA)
Distribution Limits
Public
Copyright
Other