This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Estimation Method for Automobile Aerodynamic Noise
Annotation ability available
Sector:
Language:
English
Abstract
Cost and weight reduction considerations make it very important to evaluate and reduce aerodynamic noise in the early stage of vehicle develpment. For these reasons, a method to evaluate aerodynamic noise quantitatively is needed. As an initial step, our first paper investigated airflow around the A-pillar of a full-scale vehicle. As a result, vortical flow structure and the influence of the vortical flow on the pressure fluctuations were clarified. As the second step, this paper presents an estimation method for the aerodynamic noise from a vehicle. Based on Lighthill's equation, we propose an evaluation equation to estimate aerodynamic noise. The aerodynamic noise radiated externally from a vehicle is estimated as ∑(Pfi,fi,Sfi)2 Where Pfi is the fluctuating pressure on the surface of the vehicle, fi the frequency and Sfi the correlation area. The method is applied to the aerodynamic noise problem associated with the A-pillar of a vehicle. The proposed method clarifies how the aerodynamic noise is increased depending on the vehicle speed at typical frequencies.
Recommended Content
| Technical Paper | The Chrysler 3/8-Scale Pilot Wind Tunnel |
| Technical Paper | Flow around an Isolated Wheel - Experimental and Numerical Comparison of Two CFD Codes |
| Technical Paper | CFD Turbine Blade Analysis of an A/C Automotive Blower |
Authors
Citation
Haruna, S., Kamimoto, I., and Okamoto, S., "Estimation Method for Automobile Aerodynamic Noise," SAE Technical Paper 920205, 1992, https://doi.org/10.4271/920205.Also In
Vehicle Aerodynamics: Wake Flows, Computational Fluid Dynamics, and Aerodynamic Testing
Number: SP-0908; Published: 1992-02-01
Number: SP-0908; Published: 1992-02-01
References
- Haruna, S. Nouzawa, T. Kamimoto, I. Sato, H. “An Experimental Analysis and Estimation of Aerodynamic Noise Using a Production Vehicle,” SAE Paper 900316 1990
- Haruna, S. Kamimoto, I. Sato, H. “An Experimental Study of Automobile Aerodynamic Noise,” AIAA Paper 90-4027 October 1990
- George, A. R. “Automobile Aerodynamic Noise,” SAE Paper 900315 1990
- Powell, A. “Theory of Vortex Sound,” J. Acoust. Soc. Am. 36 1 January 1964 177 195
- Curle, N. “The Influence of Solid Boundaries upon Aerodynamic Sound,” Proc. R. Soc. London 505 514 1955
- Lighthill, M. J. “On Sound Generated Aerodynamically I. General Theory,” Proc. R. Soc. London 564 587 1952
- Sakao, F. “Sound Generation by Flow,” Advance of Fluid Dynamics - Turbulence in Chap. 6 221 262 1980
- Dowling, A. P. Ffowcs Williams, J. E. “Sound and Sources of Sound,” 146 167 1983