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Measurement and Analysis of Automobile Wind Noise
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English
Abstract
The transmission of aerodynamically-generated noise through panels in automobiles has become of more pressing interest in recent years. As automobile engines, transmissions, and tires have become quieter, wind noise has become more noticeable, particularly at higher speeds. Hence, an automobile manufacturer would like to know how to design the automobile to minimize the wind noise levels heard by the passengers. In this investigation, both experimental and analytical methods were applied to the problem. A simplified model of an automobile side window was subjected to wind tunnel tests. The effects of window thickness and edge conditions on the transmitted wind noise level were investigated. An attempt was made to analytically predict the transmitted noise level by using a simple Statistical Energy Analysis (SEA) model, which used an empirical expression for the fluctuating wall pressure on the window of an automobile. The measurements showed that the plate thicknesses and edge conditions studied had only small effects on the level of transmitted noise. The analytical prediction method looked promising. The method was successful at predicting the frequency distribution of transmitted noise very closely, and it predicted the absolute levels to within 10 dB.
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Citation
Callister, J. and George, A., "Measurement and Analysis of Automobile Wind Noise," SAE Technical Paper 930299, 1993, https://doi.org/10.4271/930299.Also In
References
- Lamarque, P. V. Some Notes on Wind Noise on Cars The Institution of Automobile Engineers November 1939
- Maestrello, L. Use of Turbulent Model to Calculate the Vibration and Radiation Responses of a Panel, with Practical Suggestions for Reducing Sound Level Journal of Sound and Vibration 5 3 407 448 1967
- Willmarth, W.W. Pressure Fluctuations Beneath Turbulent Boundary Layers Annual Review of Fluid Mechanics 7 13 38 1975
- Leehey, L. Structural Excitation by a Turbulent Boundary Layer: An Overview Journal of Vibration, Acoustics, Stress and Reliability in Design 110 220 225 1988
- Mohsen, A.M. Experimental Investigation of the Wall Pressure Fluctuations in Subsonic Separated Flows Boeing Company Report No. D6-17094 1967
- Fricke, F.R. Stevenson, D.C. Pressure Fluctuations in a Separated Flow Region Journal of the Acoustical Society of America 44 5 1189 1200 1968
- Fricke, F.R. Pressure Fluctuations in Separated Flows Journal of Sound and Vibration 17 1 113 123 1971
- Dowell, E.H. Master Plan for Prediction of Vehicle Interior Noise AIAA Journal 18 353 366 1980
- Blake, W.K. “Mechanics of Flow-Induced Sound and Vibration” Academic Press Orlando 1986
- George, A.R. Callister, J.R. Aerodynamic Noise of Ground Vehicles SAE Paper 911027 Wichita Kansas 1991
- Dobrzynski, W. DFVLR Germany 1983
- Watanabe, M. Harita, M. Hayashi, E. The Effect of Body Shapes on Wind Noise SAE Paper 780266 Detroit 1978
- Guy, R.W. Bhattacharya, M.C. The Transmission of Sound Through a Cavity-Backed Finite Plate Journal of Sound and Vibration 27 2 207 223 1973
- Oswald, L.J. Dolby, D.A. A Technique for Measuring Interior Wind Rush Noise at the Clay Model Stage of Vehicle Design SAE Paper 770394 Detroit 1977
- Kraichnan, R.H. Noise Transmission from Boundary Layer Pressure Fluctuations Journal of the Acoustical Society of America 29 1 65 80 1957
- Lin, Y.K. “Probabilistic Theory of Structural Dynamics” McGraw-Hill New York 1967
- Lyon, R.H. “Statistical Energy Analysis of Dynamical Systems: Theory and Applications” MIT Press Cambridge 1975
- Haruna, S. Nouzawa, T. Kamimoto, I Hiroshi, S. An Experimental Analysis and Estimation of Aerodynamic Noise Using a Production Vehicle SAE Paper 900316 Detroit 1990
- Fahy, F. “Sound and Structural Vibration: Radiation, Transmission, and Response” Academic Press Orlando 1985
- Cremer, I. Heckl, M. “Structure-Borne Sound: Structural Vibrations and Sound Radiation at Audio Frequencies” Ungar E.E. 2nd Springer-Verlag Berlin 1988
- Duell, E.G. George, A.R. Unsteady Near Wake Flows of Ground Vehicle Bodies AIAA Paper 92-2641 Palo Alto, California 1992
- Kost, D. “Design of a Portable Anechoic Chamber” Master of Engineering Project Report Mechanical and Aerospace Engineering Department, Cornell University June 1991