A Computational Approach to Assess Buffeting and Broadband Noise Generated by a Vehicle Sunroof

Oettle, Nicholas; Meskine, Mohammed; Senthooran, Sivapalan; Bissell, Andrew; Balasubramanian, Gana; Powell, Roger A.

doi:10.4271/2015-01-1532

Cited by 17 publications

(8 citation statements)

References 24 publications

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“…summations over the set of discrete directions, of the particle distribution function [8][9][10]25,26,28,29,31,32 . LBM is used and validated across many aeroacoustics applications such as automotive wind noise 13 , acoustics propagation 14 , airframe noise 15 , sunroof buffeting 16 , exhaust systems 17 , fan noise [18][19][20][21] and HVAC systems noise [22][23][24] . Further details on LBM can be found in the cited references.…”

Section: Iib Simulation Methodsmentioning

confidence: 99%

“…In this study, the Computational Fluid Dynamics/Computational AeroAcoustics (CFD/CAA) solver PowerFLOW based on the Lattice-Boltzmann Method is used to predict the transient flow field and corresponding flow-induced noise radiation [5][6][7][8][9][10][11][12] . The solver has been successfully applied in numerous industrial analyses, academic validations and investigations such as wind-noise, HVAC, fans, blower and wind-turbine problems [13][14][15][16][17][18][19][20][21][22][23][24] . Wall Pressure Fluctuations (WPF) near the tip gap are the focus of this paper, as the noise-generating mechanisms of interest for fans are expected to correlate to the measurement locations on the blade.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Airfoil Tip Leakage Aeroacoustics Predictions using a Lattice Boltzmann Based Method

Mann¹,

Kim²,

Wu³

et al. 2016

22nd AIAA/CEAS Aeroacoustics Conference

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Section: Iib Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Airfoil Tip Leakage Aeroacoustics Predictions using a Lattice Boltzmann Based Method

Mann¹,

Kim²,

Wu³

et al. 2016

22nd AIAA/CEAS Aeroacoustics Conference

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“…Thus far, the most stable and practical passive control technique for sunroof buffeting reduction is to install a deflector near the leading edge of the sunroof opening. There are different types of deflectors, such as the castle type, the tubular type (Kook, 2008; Kook et al, 2009, 2010), the mesh type (Oettle et al, 2015), and the flat type (Karbon and Singh, 2002; An and Singh, 2006). The noise reduction effect of the conventional castle type deflector used in the vehicle of this study is rather poor.…”

Section: Passive Control Of Sunroof Buffetingmentioning

confidence: 99%

Computational investigation and passive control of vehicle sunroof buffeting

Zhang

et al. 2019

Journal of Vibration and Control

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A computational fluid dynamics simulation method based on large eddy simulation is presented and applied to compute the sunroof buffeting of a sport utility vehicle. The simulation result, i.e. the buffeting level curve, coincides well with the road test. The simulation method is then employed to investigate the sunroof buffeting of a vehicle during the development process in the range of 30 km/h–90 km/h. The results show that the most severe sunroof buffeting occurs at 70 km/h, which corresponds to the resonant frequency of the cabin. Flow field visualizations reveal that strong pressure fluctuations are generated inside the cabin due to vortex shedding from the leading edge and impinging onto the trailing edge of the sunroof opening, which explains the mechanism of sunroof buffeting. A new deflector with a gap and a notched upper edge is designed to replace the original castle type deflector. The simulation results show that the newly designed deflector can reduce the buffeting level to 97.9 dB; that is, the sunroof buffeting is completely eliminated. Moreover, the phenomenon of sunroof buffeting reduction is explained by comparing and analyzing the flow field between the newly designed deflector and the original deflector.

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“…This leads to a self-sustained oscillation of the shear layer. 78 Bi-directional coupling takes place between the shear layer and the acoustic response of the cabin leading to a lock-in of the vortices traveling over the sunroof to the resonant frequency of the cabin.…”

Section: Open Cavitiesmentioning

confidence: 99%

“…It occurs when the transient characteristics of the shear layer over the sunroof or rear window opening (Rossiter mode) are able to excite the acoustic Helmholtz mode of the vehicle cabin. This leads to a self-sustained oscillation of the shear layer 78 . Bi-directional coupling takes place between the shear layer and the acoustic response of the cabin leading to a lock-on of the vortices traveling over the sunroof to the resonant frequency of the cabin.…”

Section: Sunroof and Side Windowsmentioning

confidence: 99%

Automotive aeroacoustics: An overview

Oettle

Sims-Williams

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractVehicle aeroacoustic performance has a strong influence on customer perception and also has importance for safety and comfort. Wind noise performance was once differentiated by the quality of sealing. Today, achieving competitive wind noise performance also depends on minimising aeroacoustic noise sources generated by the vehicle form, and on attenuation in the noise pathway from sources on the exterior to the vehicle interior. Attenuation in the noise pathway from sources on the exterior to the vehicle interior, especially through glazed surfaces, will continue to play an important role in controlling cabin noise, with a particular emphasis on achieving attenuation efficiently in terms of component mass. The human brain is not only sensitive towards the level of steady broadband noise, but distinctive features such as tonality or modulation draw the attention of the vehicle occupant and impact negatively on perception. Complex indices are often required to define good wind noise performance. This includes the consideration of multiple frequency bands and effects of the range of yaw angles experienced on-road. A key to achieving future vehicle refinement is bringing together an understanding of unsteady onset flow conditions, their impact on cabin sound pressure level and modulation and in turn the impact of noise level and modulation on psychoacoustic perception.

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A Computational Approach to Assess Buffeting and Broadband Noise Generated by a Vehicle Sunroof

Cited by 17 publications

References 24 publications

Airfoil Tip Leakage Aeroacoustics Predictions using a Lattice Boltzmann Based Method

Airfoil Tip Leakage Aeroacoustics Predictions using a Lattice Boltzmann Based Method

Computational investigation and passive control of vehicle sunroof buffeting

Automotive aeroacoustics: An overview

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