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RESEARCH PAPERS: Noise Control and Acoustics

Reverberation Effects on Directionality and Response of Stationary Monopole and Dipole Sources in a Wind Tunnel

[+] Author and Article Information
K. J. Baumeister

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

J. Vib., Acoust., Stress, and Reliab 108(1), 82-90 (Jan 01, 1986) (9 pages) doi:10.1115/1.3269307 History: Received August 21, 1985; Online November 23, 2009

Abstract

Analytical solutions for the three-dimensional inhomogeneous wave equation with flow in a hardwall rectangular wind tunnel and in the free field are presented for a stationary monopole noise source. Dipole noise sources are calculated by combining two monopoles 180 deg out of phase. Numerical calculations for the modal content, spectral response and directivity for both monopole and dipole sources are presented. In addition, the effect of tunnel alterations, such as the addition of a mounting plate, on the tunnels reverberant response are considered. In the frequency range of practical importance for the turboprop response, important features of the free field directivity can be approximated in a hardwall wind tunnel with flow if the major lobe of the noise source is not directed upstream. However, for an omnidirectional source, such as a monopole, the hardwall wind tunnel and free field response will not be comparable.

Copyright © 1986 by ASME
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