Title: Wind noise from A-pillar and side view mirror of a realistic generic car model, DriAver

Authors: Mohamed Sukri Mat Ali; Jafirdaus Jalasabri; Anwar Mohd Sood; Shuhaimi Mansor; Haziqah Shaharuddin; Sallehuddin Muhamad

Addresses: Wind Engineering Laboratory, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Kuala Lumpur, 54100, Malaysia ' Computational Fluid Dynamics, CAE, Vehicle Integration and Analysis, Proton Holdings Berhad, Shah Alam, 40918, Malaysia ' Computational Fluid Dynamics, CAE, Vehicle Integration and Analysis, Proton Holdings Berhad, Shah Alam, 40918, Malaysia ' Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, UTM Skudai, Johor, 81310, Malaysia ' Wind Engineering Laboratory, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Kuala Lumpur, 54100, Malaysia ' Engineering Department, Razak School of Engineering and Advanced Technology, Universiti Teknologi Malaysia, Kuala Lumpur, 54100, Malaysia

Abstract: Interior noise of a production car is a total contribution mainly from engine, tyres and aerodynamics. At high speed, wind noise can dominate the total interior noise. Wind noise is associated with the unsteadiness of the flow. For most production cars, A-pillar and side view mirror are the regions where the highly separated and turbulent flows are observed. This study quantifies the wind noise contribution from A-pillar and side view mirror with respect to the interior noise of a generic realistic model, DrivAer. The noise sources are obtained numerically from the flow-structure interactions based on the unsteady Reynolds averaged Navier stokes (URANS) while the noise propagation is estimated using Curle's equation of Lighthill acoustic analogy. The sound pressure frequency spectrum of the interior noise is obtained by considering the sound transmission loss from the side glass by using the mass law for transmission loss. The study found that the noise from the A-pillar is higher than the noise from the side view mirror in the whole frequency range. Near the end of the A-pillar component contributes the highest radiated noise level with up to 20 dB louder than that at the front part of the A-pillar.

Keywords: DrivAer; A-pillar; side view mirror; wind noise.

DOI: 10.1504/IJVNV.2018.093109

International Journal of Vehicle Noise and Vibration, 2018 Vol.14 No.1, pp.38 - 61

Received: 24 Feb 2017
Accepted: 12 Feb 2018
Published online: 09 Jul 2018 *

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