Wind noise measured at the ground surface
| Autor: | Jiao Yu, Jeremy Webster, Richard Raspet, JohnPaul Abbott |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Surface (mathematics)
Time Factors Acoustics and Ultrasonics Logarithm Microphone Acoustics Transducers Wind Wind speed Spectral line Physics::Fluid Dynamics Motion Arts and Humanities (miscellaneous) Computer Simulation Physics Air Pressure Turbulence Geology Numerical Analysis Computer-Assisted Equipment Design Models Theoretical Stability conditions Physics::Space Physics Aeroacoustics Noise Porosity |
| Zdroj: | The Journal of the Acoustical Society of America. 129:622-632 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.3531809 |
| Popis: | Measurements of the wind noise measured at the ground surface outdoors are analyzed using the mirror flow model of anisotropic turbulence by Kraichnan [J. Acoust. Soc. Am. 28(3), 378-390 (1956)]. Predictions of the resulting behavior of the turbulence spectrum with height are developed, as well as predictions of the turbulence-shear interaction pressure at the surface for different wind velocity profiles and microphone mounting geometries are developed. The theoretical results of the behavior of the velocity spectra with height are compared to measurements to demonstrate the applicability of the mirror flow model to outdoor turbulence. The use of a logarithmic wind velocity profile for analysis is tested using meteorological models for wind velocity profiles under different stability conditions. Next, calculations of the turbulence-shear interaction pressure are compared to flush microphone measurements at the surface and microphone measurements with a foam covering flush with the surface. The measurements underneath the thin layers of foam agree closely with the predictions, indicating that the turbulence-shear interaction pressure is the dominant source of wind noise at the surface. The flush microphones measurements are intermittently larger than the predictions which may indicate other contributions not accounted for by the turbulence-shear interaction pressure. |
| Databáze: | OpenAIRE |
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