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Effect of Perforating an Intake Pipe on the Interior Noise of a Passenger Car

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Abstract

The intake pipes designed by some experienced engineers have small holes. However, the role of these small holes is yet to be fully understood by most engineers. At present, the only research on this issue is also controversial. This work aims to reveal the effect of perforating an intake pipe on the interior noise and provide some suggestions to automotive engineers when applying this method. First, the effect of these small holes on the source strength of the intake nozzle and perforated region is theoretically analyzed. Thereafter, the noise transfer functions of the intake nozzle and perforated region to the target response point in the cab are measured on the basis of the reciprocity principle. Finally, the effect of perforating the intake pipe on the interior noise is studied by simulating the intake noise of the experimental car with an external sound source. Results show that perforating the intake pipe can increase the order noise component of the intake noise and reduce the mid-high frequency noise in the cab, thereby improving the powerful sound quality and reducing the feeling of noisy.

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Abbreviations

a :

radius of the intake pipe, m

b :

radius of the small hole, m

c 0 :

sound velocity, c0=340 m/s

H AC :

noise transfer function (NTF) of the intake nozzle to the target response point in the cab

H BC :

NTF of the perforated region to the target response point in the cab

k :

wavenumber, k=ω/c0, rad/m

L 1 :

distance from the perforated region to the acoustic source, m

L 2 :

distance from the perforated region to the intake nozzle, m

N :

number of small holes

p i :

incident wave, Pa

p r :

reflected wave between the perforated region and the acoustic source, Pa

p l :

leaked wave, Pa

p 2t :

transmitted wave in the perforated region, Pa

p 2r :

reflected wave between the perforated region and the intake nozzle, Pa

p t :

transmitted wave in the intake nozzle, Pa

P ia, P ra, P 2ta, P 2ra, P la, and P ta :

amplitudes of sound waves pi, pr, p2t, p2r, pl, and pt, Pa

Q A :

source strength of the intake nozzle, m3/s

Q B :

source strength of the perforated region, m3/s

S a :

cross-sectional area of the intake pipe, m2

S b :

cross-sectional area of the small hole, m2

S p :

perforated area, Sp=nSb, m2

t :

thickness of the intake pipe wall, m

U i, U r, U 2t, U 2r, and U l :

volume velocity of sound waves pi, pr, p2t, p2r, and pl, m3/s

Z a :

radiation impedance of the intake nozzle, Pa·s/m3

Z h :

radiation impedance of a small hole, Pa·s/m3

Z l :

radiation impedance of the perforated region, Pa·s/m3

ρ 0 :

density of air, ρ0=1.293 kg/m3

ω :

sound angular frequency, rad/s

μ :

kinematic coefficient of viscosity, μ=1.56*10−5m2/s

A:

position of the intake nozzle

B:

position of the perforated region

C:

noise measurement point in the cab

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Acknowledgement

This study was supported by National Key Research and Development Program-Research on Application of Vibration, Noise, and Post-processing of Medium Power Agricultural Diesel Engine (Grant No. 2016YFD0700704B) and National Natural Science Foundation of China (Grant No. 51575410). We are extremely grateful to the reviewers for their constructive comments and suggestions on our manuscript, which are very helpful to the improvement of the quality of this paper.

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Authors and Affiliations

  1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, China

    Yawei Zhu, Chihua Lu, Zhien Liu, Liping Xie & Xiaolong Li

  2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430070, China

    Yawei Zhu, Chihua Lu, Zhien Liu, Liping Xie & Xiaolong Li

  3. Hubei Research Center for New Energy & Intelligent Connected Vehicle, Wuhan University of Technology, Wuhan, 430070, China

    Yawei Zhu, Chihua Lu, Zhien Liu, Liping Xie & Xiaolong Li

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  1. Yawei Zhu
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  2. Chihua Lu
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  3. Zhien Liu
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Correspondence to Zhien Liu.

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Zhu, Y., Lu, C., Liu, Z. et al. Effect of Perforating an Intake Pipe on the Interior Noise of a Passenger Car. Int.J Automot. Technol. 22, 921–929 (2021). https://doi.org/10.1007/s12239-021-0083-6

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  • DOI: https://doi.org/10.1007/s12239-021-0083-6

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