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Journal of the Acoustical Society of America

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Nov 1978

Volume 64, Issue S1, pp. S1-S183

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back to top Session OOO. Additional Papers (Poster)
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A comparison of community noise abatement strategies (A)

Arnold G. Konheim and Casey Caccavari

J. Acoust. Soc. Am. Volume 64, Issue S1, pp. S183-S183 (1978); (1 page)

Online Publication Date: 11 Aug 2005

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As part of its technical assistance program to state and local governments, EPA has been developing a computer‐optimized noise abatement model. Based upon the results of acoustical and attitudinal surveys performed by a community, the model considers the relative benefits of several countermeasures, e.g., property‐line standards or vehicle noise‐level standards. A community using the model will be able to achieve the most cost‐effective noise abatement strategy. The results of the implementation of the model at two stages of refinement are compared for three communities.
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Spectral shape of flow noise, turbulence, and wall pressure fluctuations (A)

J. P. Clay

J. Acoust. Soc. Am. Volume 64, Issue S1, pp. S183-S183 (1978); (1 page)

Online Publication Date: 11 Aug 2005

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An elementary model of how a turbulent boundary layer (BI) generates noise is analyzed. Two similarity hypotheses are given which relate B 1 turbulence to flow noise. (I) Dynamic pressures come from the forces created by the interaction of eddies on the viscous sublayer where velocity components normal to the wall are brought to rest. (II) The forces are proportional to the second power of the eddy velocities and the distribution of separation distance between pressure points on the wall is the same as the distribution of eddy sizes. It is concluded that flow noise, wall pressure fluctuations, and BI turbulence all have the same spectral shape in frequency space: of f−5/3. Data on wall pressure fluctuations generally have a f−11/3 form due to spatial averaging by the pressure sensor. Corrections for pressure sensor averaging are given and experimental data are given to demonstrate the validity of the correction. [Work supported by NAVSEA‐03133.]
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