Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer

Vehicle interior noise level has now become one of the indicators of driving comfort. However, the generation of noise is a complex phenomenon where it involves various sound sources with different ways of radiation. This research focuses on the generation of wind noise from the A-pillar and side-vi...

Full description

Saved in:

Bibliographic Details
Main Author:	Shaharuddin, Nur Haziqah
Format:	Thesis
Language:	English
Published:	2022
Subjects:	T Technology (General)
Online Access:	http://eprints.utm.my/id/eprint/99699/1/NurHaziqahShaharuddinMMJIIT2022.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.99699
record_format	uketd_dc
spelling	my-utm-ep.996992023-03-10T01:46:59Z Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer 2022 Shaharuddin, Nur Haziqah T Technology (General) Vehicle interior noise level has now become one of the indicators of driving comfort. However, the generation of noise is a complex phenomenon where it involves various sound sources with different ways of radiation. This research focuses on the generation of wind noise from the A-pillar and side-view mirror of a generic vehicle model known as DrivAer, based on the physical flow behaviour. The main objective of this study is to find the physical flow that causes the generation of A-pillar wind noise and to propose the relation between the A-pillar angles and length of side-view mirror with wind noise generation. This study is conducted numerically at a Reynolds number of Re = 12.17 × 106, with respect to the length of DrivAer model. The noise source is obtained from the incompressible Unsteady Reynolds Averaged Navier- Stokes (URANS); and the noise radiation is predicted using an acoustic analogy based on Curle’s equations. Reliability and validity of the calculations are tested by comparing the basic model with data of experimental studies from previous researchers, whereby the result indicates an almost similar outcome. A total of eight main cases have been studied. These cases include A-pillar cases of varying angles which are 610, 580 (baseline case), 500 and 420; and four side view mirror cases of varying gaps which are 180mm,190mm, 230mm and 240mm. Results have shown that increasing the A-pillar angle makes the sound pressure level louder. 84.33 dB is generated when the A-pillar angle is at 610 and 76.41 dB is generated when the Apillar angle is at 420. The formation of the A-pillar conical vortex formed along the Apillar has been found responsible for the generation of the wind noise. In the case of different side-view mirror position, in which the A-pillar angle remains constant, results for all cases are almost the same according to the A-pillar sound pressure level and sound source level results, in which the noise generated is about 82 dB for all cases of side-view mirror. 2022 Thesis http://eprints.utm.my/id/eprint/99699/ http://eprints.utm.my/id/eprint/99699/1/NurHaziqahShaharuddinMMJIIT2022.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:150830 masters Universiti Teknologi Malaysia Malaysia-Japan International Institute of Technology (MJIIT)
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	T Technology (General)
spellingShingle	T Technology (General) Shaharuddin, Nur Haziqah Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer
description	Vehicle interior noise level has now become one of the indicators of driving comfort. However, the generation of noise is a complex phenomenon where it involves various sound sources with different ways of radiation. This research focuses on the generation of wind noise from the A-pillar and side-view mirror of a generic vehicle model known as DrivAer, based on the physical flow behaviour. The main objective of this study is to find the physical flow that causes the generation of A-pillar wind noise and to propose the relation between the A-pillar angles and length of side-view mirror with wind noise generation. This study is conducted numerically at a Reynolds number of Re = 12.17 × 106, with respect to the length of DrivAer model. The noise source is obtained from the incompressible Unsteady Reynolds Averaged Navier- Stokes (URANS); and the noise radiation is predicted using an acoustic analogy based on Curle’s equations. Reliability and validity of the calculations are tested by comparing the basic model with data of experimental studies from previous researchers, whereby the result indicates an almost similar outcome. A total of eight main cases have been studied. These cases include A-pillar cases of varying angles which are 610, 580 (baseline case), 500 and 420; and four side view mirror cases of varying gaps which are 180mm,190mm, 230mm and 240mm. Results have shown that increasing the A-pillar angle makes the sound pressure level louder. 84.33 dB is generated when the A-pillar angle is at 610 and 76.41 dB is generated when the Apillar angle is at 420. The formation of the A-pillar conical vortex formed along the Apillar has been found responsible for the generation of the wind noise. In the case of different side-view mirror position, in which the A-pillar angle remains constant, results for all cases are almost the same according to the A-pillar sound pressure level and sound source level results, in which the noise generated is about 82 dB for all cases of side-view mirror.
format	Thesis
qualification_level	Master's degree
author	Shaharuddin, Nur Haziqah
author_facet	Shaharuddin, Nur Haziqah
author_sort	Shaharuddin, Nur Haziqah
title	Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer
title_short	Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer
title_full	Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer
title_fullStr	Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer
title_full_unstemmed	Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer
title_sort	wind noise simulation of the a-pillar and side view mirror using generic vehicle model, drivaer
granting_institution	Universiti Teknologi Malaysia
granting_department	Malaysia-Japan International Institute of Technology (MJIIT)
publishDate	2022
url	http://eprints.utm.my/id/eprint/99699/1/NurHaziqahShaharuddinMMJIIT2022.pdf
_version_	1776100635178958848

Wind noise simulation of the a-pillar and side view mirror using generic vehicle model, DrivAer

Similar Items