Aeroacoustic Measurements in Turbulent Flow on the Road and in the Wind Tunnel

Lindener, Norbert; Miehling, Hans; Cogotti, A.; Cogotti, F.; Maffei, Massimo E.

doi:10.4271/2007-01-1551

Cited by 40 publications

(22 citation statements)

References 7 publications

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“…In addition, the turbulence intensity is comparable to that reported previously by Wordley (2009) [10] and also to Lindener et al (2007) [12].…”

Section: Figure 11 Component Turbulence Intensity Vs Bulk Turbulencsupporting

confidence: 89%

“…A small number of studies have taken place including those by Watkins et al (2001) [8] and Lindener et al (2007) [12], comparing the cabin noise response of a vehicle on-road and in the aeroacoustic wind tunnel. Previous work by Oettle et al (2010) [13] has shown that on-road, the cabin noise can vary in level from that predicted by the aeroacoustic wind tunnel.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Unsteady On-Road Flow Conditions on Cabin Noise: Spectral and Geometric Dependence

Oettle

Sims-Williams

Dominy

et al. 2011

SAE Int. J. Passeng. Cars – Mech. Syst.

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. (2011) 'The eects of unsteady on-road ow conditions on cabin noise : spectral and geometric dependence.', SAE International journal of passenger cars. Mechanical systems., 4 (1). pp. 120-130. Further information on publisher's website:http://dx.doi.org/10.4271/2011-01-0159Publisher's copyright statement:Additional information: Use policyThe 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. ABSTRACTThe in-cabin sound pressure level response of a vehicle in yawed wind conditions can differ significantly between the smooth flow conditions of the aeroacoustic wind tunnel and the higher turbulence, transient flow conditions experienced on the road. Previous research has shown that under low turbulence conditions there is close agreement between the variation with yaw of in-cabin sound pressure level on the road and in the wind tunnel. However, under transient conditions, sound pressure levels on the road were found to show a smaller increase due to yaw than predicted by the wind tunnel, specifically near the leeward sideglass region.The research presented here investigates the links between transient flow and aeroacoustics. The effect of small geometry changes upon the aeroacoustic response of the vehicle has been investigated. It was found that sideglass pressures showed close agreement at all turbulence levels while surface sound pressure levels also showed similar behaviour under a wide range of on-road flow conditions. While the overall sideglass sound pressure level changed under the various yaw conditions, the change in shape of the frequency spectrum was less significant.Geometry changes made to a base vehicle reduced the sensitivity of the in-cabin noise to on-road turbulence, showing that shape-change can modify sensitivity to on-road turbulence.

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“…In addition, the turbulence intensity is comparable to that reported previously by Wordley (2009) [10] and also to Lindener et al (2007) [12].…”

Section: Figure 11 Component Turbulence Intensity Vs Bulk Turbulencsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The Effects of Unsteady On-Road Flow Conditions on Cabin Noise: Spectral and Geometric Dependence

Oettle

Sims-Williams

Dominy

et al. 2011

SAE Int. J. Passeng. Cars – Mech. Syst.

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“…: as investigated by [7], [8], [9], [10]) or cabin noise (e.g. : [11], [12], [13]). This depends on a combination of the onset unsteadiness experienced on-road and the vehicle's response to that unsteadiness.…”

Section: Aerodynamic Response To Unsteady Flowmentioning

confidence: 99%

A Wind Tunnel Simulation Facility for On-Road Transients

Mankowski¹,

Sims-Williams²,

Dominy³

2014

SAE Int. J. Passeng. Cars - Mech. Syst.

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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.

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“…This can be important from the point of view of vehicle handing ( [2,3,4,5,6,7,8]), fuel economy ( [9,10]) or wind noise ( [11,12,13,14,15,16]). …”

Section: Introductionmentioning

confidence: 99%

The Effects of Unsteady Flow Conditions on Vehicle in Cabin and External Noise Generation

Kounenis¹,

Sims-Williams²,

Dominy³

et al. 2015

SAE Technical Paper Series

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Citation for published item:uounenisD ghrlmpos nd imsEillimsD hvid nd hominyD oert nd fersonD ergnth¤ el nd yettleD xihols nd preemnD glire @PHISA 9he e'ets of unstedy )ow onditions on vehile in in nd externl noise genertionF9D ei tehnil pper seriesF F PHISEHIEISSSF Further information on publisher's website: httpsXGGdoiForgGIHFRPUIGPHISEHIEISSS Publisher's copyright statement:Copyright c 2015 SAE International. This paper is posted on this site with permission from SAE International. It may not be shared, downloaded, duplicated, printed or transmitted in any manner, or stored on any additional repositories or retrieval system without prior written permission from SAE. Additional information:Use policyThe 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. AbstractA vehicle driving on the road experiences unsteady flow conditions which are not generally reproduced in the development environment. This paper investigates the potential importance of this difference to aeroacoustics and hence to occupant perception and proposes a methodology to enable better ranking of designs by taking account of wind noise modulation.Two approaches of reproducing the effects of unsteady wind on aeroacoustics were investigated: an active wind tunnel Turbulence Generation System (TGS) and a quasi-steady approach based on measurements at a series of fixed yaw angles. A number of tools were used to investigate the onset flow and its impacts, including roofmounted probe, acoustic heads and surface microphones. External noise measurements help to reveal the response of separate exterior noise sources to yaw.The noise experienced by the driver or passenger ear facing the side-glass is dominated by increased sound pressure levels when the adjacent side-glass is the leeward side of the vehicle with some non-linear effects as leeward yaw produces first accelerated flow and then separation.In part because of non-linearity in response to yaw, a challenging parameter for a wind tunnel simulation of dynamic yaw is achieving a wide enough variation in yaw angle and this work suggests that considering an appropriate range of yaw angles is more important than capturing the dynamics.In terms of passenger perception, the most important effect of a time-varying onset flow was demonstrated to be the modulation of wind noise rather than the increase in time-averaged cabin noise. For the case considered, at 130 km/h, the impact of wind-noise modulation was found to be equivalent to an extra 1-2 dBA in terms of passenger perception, while the increment in time-averaged cabin noise w...

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Aeroacoustic Measurements in Turbulent Flow on the Road and in the Wind Tunnel

Cited by 40 publications

References 7 publications

The Effects of Unsteady On-Road Flow Conditions on Cabin Noise: Spectral and Geometric Dependence

The Effects of Unsteady On-Road Flow Conditions on Cabin Noise: Spectral and Geometric Dependence

A Wind Tunnel Simulation Facility for On-Road Transients

The Effects of Unsteady Flow Conditions on Vehicle in Cabin and External Noise Generation

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