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Computational Analysis and Design to Minimize Vehicle Roof Rack Wind Noise
Technical Paper
2005-01-0602
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a study of roof rack wind noise using commercial Computational Fluid Dynamics (CFD) software. The focus is to predict the noise generated from the roof rack cross bars mounted on a realistic vehicle geometry. Design iterations are created by altering the cross bar orientation. Results from the CFD simulations include frequency spectra of Sound Pressure Level (SPL) for comparison to typical wind tunnel measurements. Aerodynamic results of body lift, drag, and transient flow visualization are also produced to support the noise data. The CFD and physical experiments compare very well with respect to tonal noise generation, tonal frequency content, and relative magnitudes. It is concluded that the CFD method is suitable for predicting relative performance, ranking design concepts, and optimizing large scale geometry parameters of vehicle roof racks in a production-engineering environment.
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Citation
Karbon, K. and Dietschi, U., "Computational Analysis and Design to Minimize Vehicle Roof Rack Wind Noise," SAE Technical Paper 2005-01-0602, 2005, https://doi.org/10.4271/2005-01-0602.Also In
SAE 2005 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V114-6; Published: 2006-02-01
Number: V114-6; Published: 2006-02-01
References
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