Assessing the Aeroacoustic Response of a Vehicle to Transient Flow Conditions from the Perspective of a Vehicle Occupant

Oettle, Nicholas; Sims-Williams, David; Dominy, Robert

doi:10.4271/2014-01-0591

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…This is not to say that achieving robust sealing is easy, including because sealing is Figure 8. Comparison of simulated and measured cabin noise using a modulation approach 96,109 .…”

Section: Discussionmentioning

confidence: 99%

“…Since the aeroacoustic sources as shown in Figure 4 have a strong sensitivity to changes in flow speed and yaw angle, this can strongly affect the noise heard inside the cabin. 96 This has led to a number of studies taking place comparing the wind noise measured under unsteady conditions to that measured under steady conditions. These can be grouped into those that assess the vehicle response when applying oncoming flow unsteadiness, and those that use quasi-steady approaches.…”

Section: Unsteady Environmentmentioning

confidence: 99%

“…The combination of each of these factors can lead to time-varying changes in flow speed and yaw angle over the vehicle. Since the aeroacoustic sources as shown in Figure 4 have a strong sensitivity to changes in flow speed and yaw angle, this can strongly affect the noise heard inside the cabin 96 . This has led to a number of studies taking place comparing the wind noise measured under unsteady conditions to that measured under steady conditions.…”

Section: Unsteady Environmentmentioning

confidence: 99%

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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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“…This is not to say that achieving robust sealing is easy, including because sealing is Figure 8. Comparison of simulated and measured cabin noise using a modulation approach 96,109 .…”

Section: Discussionmentioning

confidence: 99%

Section: Unsteady Environmentmentioning

confidence: 99%

Section: Unsteady Environmentmentioning

confidence: 99%

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Automotive aeroacoustics: An overview

Oettle

Sims-Williams

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Experimental Investigation of Aeroacoustic Cabin Noise in Unsteady Flow by Means of a New Turbulence Generating Device

Terakado¹,

Makihara²,

Sugiyama³

et al. 2017

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

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Improvements to a Method to Simulate Non-Stationary Wind Noise in Vehicles

Yu¹,

Davies²

2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">As the vehicle and wind speeds and directions change, the unsteady flow creates non-stationary wind noise. To investigate people’s perceptions of non-stationary wind noise, a method to simulate the non-stationary wind noise is needed. Previously, a method was developed that used stationary recordings taken at several speeds and directions to create a set of sound pressure level predictions in each one-third octave band that are a function of wind speed and direction. These functions are used to create time-varying filters based on provided wind profiles. A reference wind noise measurement is then filtered to produce the sounds. A drawback of this method is that many stationary wind condition measurements are needed to form accurate sound pressure level functions, which can be time consuming. A method requiring fewer measurements was investigated. At each yaw angle one non-stationary noise measurement and one stationary reference measurement are used to estimate the relationship between sound power and wind speed. The accuracy of the estimation was validated by comparing wind noise simulations with wind tunnel measurements, A further improvement is to use partially correlated white noise signals to simulate binaural sounds that have a similar coherence structure between the left and right ear sounds to that observed in binaural measurements in the vehicle.</div></div>

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Assessing the Aeroacoustic Response of a Vehicle to Transient Flow Conditions from the Perspective of a Vehicle Occupant

Cited by 5 publications

References 14 publications

Automotive aeroacoustics: An overview

Automotive aeroacoustics: An overview

Experimental Investigation of Aeroacoustic Cabin Noise in Unsteady Flow by Means of a New Turbulence Generating Device

Improvements to a Method to Simulate Non-Stationary Wind Noise in Vehicles

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