This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Design of Wind Noise Transducers to Separate Acoustic and Turbulent Pressures
Technical Paper
2017-01-1899
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A four element wind noise transducer has been designed with surface mounted electret microphones in an array pattern which allows for the separate determination of the acoustic and turbulent pressures in wind noise. Three closely spaced transducers, defining an x-y coordinate system, are positioned to determine the velocity and direction of the turbulent flow. A fourth transducer is positioned at a greater distance such that the correlation of the turbulent flow will be diminished while the correlation of the acoustic pressure remains due to its longer wavelength. By averaging the cross-spectral densities of the pressure signals over time, the two contributors to wind noise can be differentiated. In addition, a wireless interface has been designed to minimize the flow disturbance of the transducer array.
Recommended Content
Authors
Topic
Citation
Zylstra, N. and DeJong, R., "The Design of Wind Noise Transducers to Separate Acoustic and Turbulent Pressures," SAE Technical Paper 2017-01-1899, 2017, https://doi.org/10.4271/2017-01-1899.Also In
References
- Blake , W.M. and Chase , D.M. Wavenumber-frequency spectra of turbulent-boundary-layer pressure measured by microphone arrays J. Acoust. Soc. Am. 49 862 877 1971 10.1121/1.1912427
- Martin , N.C. and Leehey , P. Low wavenumber wall pressure measurements using a rectangular membrane as a spatial filter J. Sound and Vibration 52 95 120 1977 10.1016/0022-460X(77)90391-1
- Chase , D.M. Modeling the wavevector-frequency spectrum of turbulent boundary layer wall pressure J. Sound and Vibration 70 29 67 1980 10.1016/0022-460X(80)90553-2
- Chase , D.M. The wave-vector-frequency spectrum of pressure on a smooth plane in turbulent-boundary-layer flow at low Mach number J. Acoust. Soc. Am. 90 1032 1040 1991 10.1121/1.402291
- Howe , M.S. Surface pressures and sound produced by turbulent flow over smooth and rough walls J. Acoust. Soc. Am. 90 1041 1047 1991 10.1121/1.402292
- Rovedatti , V. , Milhorn , J. , DeJong , R. , and Ebbitt , G. Vehicle Wind Noise Measurements in a Wind Tunnel with a Contoured Top Profile SAE Int. J. Passeng. Cars - Mech. Syst. 9 1 234 237 2016 10.4271/2016-01-1316
- Milhorn , J. , Rovedatti , V. , DeJong , R. , and Ebbitt , G. Road Tests of the Acoustic Loads on the Back Panels of a Pickup Truck SAE Technical Paper 2016-01-1300 2016 10.4271/2016-01-1300