This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
CAA Application to Automobile Wind Throb Prevention Design
Technical Paper
2014-01-0593
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
When a window opens to provide the occupant with fresh air flow while driving, wind throb problems may develop along with it. This work focuses on an analytical approach to address the wind throb issue for passenger vehicles when a front window or sunroof is open. The first case of this paper pertains to the front window throb issue for the current Ford Escape. Early in a program stage, CAA (Computational Aeroacoustics) analysis predicted that the wind throb level exceeded the program wind throb target. When a prototype vehicle became available, the wind tunnel test confirmed the much earlier analytical result. In an attempt to resolve this issue, the efforts focused on a design proposal to implement a wind spoiler on the side mirror sail, with the spoiler dimension only 6 millimeters in height. This work showed that the full vehicle CAA analysis could capture the impact of this tiny geometry variation on the wind throb level inside the vehicle cabin. The independent wind tunnel effort came to the same conclusion, and the difference between the analysis and testing is only about 1 dB. With the implementation of this spoiler, the program target was finally met. The second case of this paper deals with the sunroof throb issue for an SUV. The work concentrates on the modeling method of wind deflectors made of meshed fabric material and carrying out CAA analysis to access the sunroof wind throb level. The result shows that CAA can predict very well the impact of the wind deflector made of meshed fabric material on the wind throb level, in line with the subjective evaluation on proving ground. In summary, this work manifests that CAA is a very effective tool for wind throb prevention design when hardware prototypes are not available.
Recommended Content
Authors
Topic
Citation
Hou, H., "CAA Application to Automobile Wind Throb Prevention Design," SAE Technical Paper 2014-01-0593, 2014, https://doi.org/10.4271/2014-01-0593.Also In
References
- Rayleigh , B. The Theory of Sound II 170 172 Dover Publications New York, USA 1979
- Bodger , W. and Jones , C. Aerodynamic Wind Throb in Passenger Cars SAE Technical Paper 640797 1964 10.4271/640797
- Aspinall , D.T. An Empirical Investigation of low Frequency Wind Noise in Motor Cars MIRA Report No. 1966/2 Warwickshire, UK 1966
- Hendriana , D. , Sovani , S. , and Schiemann , M. On Simulating Passenger Car Side Window Buffeting SAE Technical Paper 2003-01-1316 2003 10.4271/2003-01-1316
- An , C. , Alaie , S. , Sovani , S. , Scislowicz , M. et al. Side Window Buffeting Characteristics of an SUV SAE Technical Paper 2004-01-0230 2004 10.4271/2004-01-0230
- Zhu , X. and Gleason , M. A Process of Side Window Buffeting Prediction SAE Technical Paper 2006-01-1573 2006 10.4271/2006-01-1573
- Chen , F. and Qian , P. Vehicle Wind Buffeting Noise Reduction via Window Openings Optimization SAE Technical Paper 2008-01-0678 2008 10.4271/2008-01-0678
- Balasubramanian , G. , Mutnuri , L. , Sugiyama , Z. , Senthooran , S. et al. A Computational Process for Early Stage Assessment of Automotive Buffeting and Wind Noise SAE Int. J. Passeng. Cars - Mech. Syst. 6 2 1231 1238 2013 10.4271/2013-01-1929
- An , C. , Puskarz , M. , Singh , K. , and Gleason , M. Attempts for Reduction of Rear Window Buffeting Using CFD SAE Technical Paper 2005-01-0603 2005 10.4271/2005-01-0603
- Walker , R. and Wei , W. Optimization of Mirror Angle for Front Window Buffeting and Wind Noise Using Experimental Methods SAE Technical Paper 2007-01-2401 2007 10.4271/2007-01-2401
- Deaton , L. , Rao , M. , and Shih , W. Root Cause Identification and Methods of Reducing Rear Window Buffeting Noise SAE Technical Paper 2007-01-2402 2007 10.4271/2007-01-2402
- An , C. and Singh , K. Sunroof Buffeting Suppression Using a Dividing Bar SAE Technical Paper 2007-01-1552 2007 10.4271/2007-01-1552
- Mendonca , F. CFD/CAE Combinations in Open Cavity Noise Predictions for Real Vehicle Sunroof Buffeting SAE Int. J. Passeng. Cars - Mech. Syst. 6 1 360 368 2013 10.4271/2013-01-1012
- Crouse , B. , Senthooran , S. , Balasubramanian , G. , Freed , D. et al. Computational Aeroacoustics Investigation of Automobile Sunroof Buffeting SAE Technical Paper 2007-01-2403 2007 10.4271/2007-01-2403
- Islam , M. , Decker , F. , Hartmann , M. , Jäger , A. et al. Investigations of Sunroof Buffeting in an Idealized Generic Vehicle Model - Part 1: Experimental Results AIAA Paper 2008-2900 2008
- Islam , M. , Decker , F. , Hartmann , M. , Jäger , A. et al. Investigations of Sunroof Buffeting in an Idealised Generic Vehicle Model - Part 2: Numerical Simulations AIAA Paper 2008-2901 2008
- Balasubramanian , G. , Crouse , B. and Freed , D. Numerical Simulation of Leakage Effects on Sunroof Buffeting of an Idealized Generic Vehicle AIAA Paper 2009-3348 2009
- Mendonça , F. , Shaw T. , Tran L. , and Mueller A. Aero-Vibroacoustics Fully Coupled Prediction of Panel Impedance Effects in Sunroof Buffeting AIAA-2011-2817 2011
- An , C. and Singh , K. Optimization Study for Sunroof Buffeting Reduction SAE Technical Paper 2006-01-0138 2006 10.4271/2006-01-0138
- Ota , D.K. , Chakravarthy , S.R. , Becker , T. , and Sturzenegger , T. Computational Study of Resonance Suppression of Open Sunroofs J. Fluids Eng. 116 877 882 1994
- Mongeau , L. , Franchek , M. , and Kook , H. Control of Interior Pressure Fluctuations Due to Flow Over Vehicle Openings SAE Technical Paper 1999-01-1813 1999 10.4271/1999-01-1813
- Fluent 6.3 User's Guide, Section 7.22 Fluent Inc. 2006