Sound Diffraction Modeling of Rotorcraft Noise Around Terrain
James H. Stephenson, Ben W. Sim, US Army; Subhashini Chitta, John Steinhoff, Wave CPC, Inc
May 8, 2017
Sound Diffraction Modeling of Rotorcraft Noise Around Terrain
- Presented at Forum 73 - Best Paper for this session
- 13 pages
- SKU # : 73-2017-0021
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Sound Diffraction Modeling of Rotorcraft Noise Around Terrain
Authors / Details: James H. Stephenson, Ben W. Sim, US Army; Subhashini Chitta, John Steinhoff, Wave CPC, IncAbstract
A new computational technique, Wave Confinement (WC), is extended here to account for sound diffraction around arbitrary terrain. While diffraction around elementary scattering objects, such as a knife edge, single slit, disc, sphere, etc. has been studied for several decades, realistic environments still pose significant problems. This new technique is first validated against Sommerfeld's classical problem of diffraction due to a knife edge. This is followed by comparisons with diffraction over three-dimensional smooth obstacles, such as a disc and Gaussian hill. Finally, comparisons with flight test acoustics data measured behind a hill are also shown. Comparison between experiment and Wave Confinement prediction demonstrates that a Poisson spot occurred behind the isolated hill, resulting in significantly increased sound intensity near the center of the shadowed region.
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Sound Diffraction Modeling of Rotorcraft Noise Around Terrain
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