A synthesis procedure for pass-by noise of automotive vehicles employing numerically evaluated source–receiver transfer functions

Huijssen, Jacob; Hallez, Raphael; Pluymers, Bert; Desmet, Wim

doi:10.1016/j.jsv.2013.01.042

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…While sound radiation from tyres has been rigorously studied in the past [4], various studies have been also conducted to estimate tyre noise contribution to pass-by noise in fully operational conditions. A few of these studies deploy numerical means, such as different variations of the Boundary Element Method [5,6], to calculate vehicle pass-by noise. However, despite their good accuracy, they are mostly suited for pass-by noise estimation on the basis of the CAD/CAE computer models, early in the design stage.…”

Section: Introductionmentioning

confidence: 99%

Power-based application of frequency-averaged 𝓁₁-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

et al. 2021

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Pass-by noise contribution analysis is an engineering procedure employed to estimate the contributions from various noise sources on a vehicle to the overall sound pressure level. This can be realised by placing a set of microphones close to the various sources to estimate their source strengths and then synthesising the response at a far-field linear array in the presence of the remaining sources. The results described in this paper rely on measured near-field pressure data close to the tyres of an electric vehicle under accelerating conditions. The number and position of the estimated virtual source strengths used is a compromise between complexity and accuracy, which has previously been addressed mostly empirically. A power-based, frequency-averaged 𝓁1-norm regularisation technique is investigated to optimise the equivalent source position and strength for one operating tyre and, subsequently, the far-field pass-by noise pressure estimates. It is shown that for the tyre under investigation, optimising the positions of only two equivalent sources over the frequency range of interest gives a good representation of the measured far-field spectra.

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Section: Introductionmentioning

confidence: 99%

Power-based application of frequency-averaged 𝓁₁-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

et al. 2021

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“…When a vehicle is running at a high speed, aerodynamic noises will make the greatest contribution to the interior noise in vehicles [1][2][3]. Therefore, it will decide comfort of the vehicle [4][5][6]. Due to irregular surfaces and structures on the vehicle, high-speed airflows will cause a serious separation phenomenon while passing the outer surface of the vehicle, so that a complicated turbulent flow structure will be caused.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on aerodynamic noises of the lateral window in vehicles

Chen¹,

Wang²,

Zhou³

2017

J. vibroeng.

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The paper firstly conducted a numerical simulation for flow fields and aerodynamic noises of the lateral window region in vehicles, and verified its correctness using the experimental test. Numerical simulation shows that: A pillar has a complicated shape and large corner, so that airflows will be separated here. An eddy structure is caused in the lateral window region and develops along the A pillar to generate serious pressure pulsations. A low pressure region is formed behind the A pillar. Obvious airflow separation regions are in the A pillar, rear view mirrors, wheels and wheel chambers. These airflow separation regions are typical positions causing aerodynamic noises. Additionally, large separated regions are located at the tail part of the vehicle, which is a main reason for causing the aerodynamic resistance. Intensity and velocity of eddies near the lateral window surface are relatively large, while its intensity near edges of the rear view mirror is weak. The shape of eddies extends along the flow direction to be an oval shape. The separated and broken eddies are sources for causing pressure pulsations. According to sound pressures of observation points, it can be also found that the separated eddy is a main reason for causing aerodynamic noises. Sound pressures are low at the right upper corner of lateral windows. In addition, noise distributions on the lateral window become gradually uniform with the increased frequency. In order to reduce flow noises, a bionic saw-tooth structure is applied to A pillars and rear view mirrors. After the bionic structure is introduced, some fluids are adhered to A pillars and rear view mirrors, so that the energy of fluids reaching the lateral window is reduced. In addition, fluids in rear regions of the rear view mirror presented a spiral shape, so that the possibility of fluid diffusion will be also reduced. In the original model, the maximum energy is 57.77, while that in this region with the bionic saw-tooth structures is 55.00. Obviously, the eddy energy is weakened. Compared with the original model, flow noises of all the observation points are reduced to different degrees, and the noise reduction effect is obvious. The results fully prove that this region with bionic saw-teeth in this paper has obvious advantages in noise reduction.

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Analysis of sound level emitted by vehicle regarding age

et al. 2017

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A synthesis procedure for pass-by noise of automotive vehicles employing numerically evaluated source–receiver transfer functions

Cited by 11 publications

References 17 publications

Power-based application of frequency-averaged 𝓁₁-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

Power-based application of frequency-averaged 𝓁₁-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

Numerical investigation on aerodynamic noises of the lateral window in vehicles

Analysis of sound level emitted by vehicle regarding age

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A synthesis procedure for pass-by noise of automotive vehicles employing numerically evaluated source–receiver transfer functions

Cited by 11 publications

References 17 publications

Power-based application of frequency-averaged 𝓁1-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

Power-based application of frequency-averaged 𝓁1-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

Numerical investigation on aerodynamic noises of the lateral window in vehicles

Analysis of sound level emitted by vehicle regarding age

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Power-based application of frequency-averaged 𝓁₁-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

Power-based application of frequency-averaged 𝓁₁-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise