Prediction and Aerodynamic Analysis of Interior Noise and Wind Drag Generated by the Outside Rear-View Mirror for Commercial Vehicles

Hu, Binfei; Lu, Zengjun; Cui, Qiming; Tang, Rongjiang; Feng, Zhe; Bi, Daokun

doi:10.1155/2020/8893959

Cited by 3 publications

(4 citation statements)

References 27 publications

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“…In the car design, engineers can design the appearance of the vehicles to reduce the its air drag from the perspective which is the rear-view mirror proposed in ref [2] will greatly affect the aerodynamic performance of the vehicles. [11], what should engineer notice is that the commercial trailer has greater air drag without a rear-view mirror. That is a point that engineers need to pay attention to.…”

Section: Case Analysismentioning

confidence: 99%

“…What is more, commercial computational fluid dynamic software for simulation can be used to spot its influence, which can help engineers correct its car design. Ref [11] is a real case of car design. The purpose of this paper is to reveal the influence of the installation of rear-view mirror on the air resistance of commercial vehicles.…”

Section: Case Analysismentioning

confidence: 99%

“…Figure 7. Different Air Resistances of Commercial Vehicles with or without Rear-view Mirrors Referring to ref[11], what should engineer notice is that the commercial trailer has greater air drag without a rear-view mirror. That is a point that engineers need to pay attention to.…”

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confidence: 99%

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Methods on Adjusting Vehicle’s Shape to Control Air Resistance

Wu¹,

Wen²

2022

HSET

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Wind resistance is usually expressed by the following formula. Fx＝ CdAρv^2 /2. Where Cd is a constant. And A is the contact area between air and car. ρ is air density. v is the velocity. Because of the complex structure, mostly a very specific and accurate model cannot be obtained directly. Instead, engineers will use wind tunnel test to get a practical drag coefficient of a car. In the actual analysis, the influence of wind resistance cannot be ignored in the car dynamic system. Wind resistance is the main factor to counteract traction in the process of high-speed driving. Knowledge and literature about aerodynamics of vehicle is abundant in the world. However, this knowledge is not directly related to car design. Engineers empirically design vehicles in the perspective of aerodynamics based on what they have learnt. This paper will put forward some suggestions on vehicle structure according to the practical application of various aerodynamics. It will simultaneously emphasize how the knowledge in the literature is related to the car design in reality. Engineers can design vehicles combining with aerodynamic theory. In recent years, wedge-shaped vehicles have become the mainstream of design, which is the result of the pursuit of low wind resistance and higher stability. The streamlined body shape conforms to both aerodynamics and mainstream aesthetics. Improving speed and safety while saving energy is the most intuitive manifestation of aerodynamic application in vehicle field.

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Section: Case Analysismentioning

confidence: 99%

Section: Case Analysismentioning

confidence: 99%

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Methods on Adjusting Vehicle’s Shape to Control Air Resistance

Wu¹,

Wen²

2022

HSET

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“…Studies have demonstrated that the shape of a sideview mirror significantly influences the aerodynamic noise (Chen et al 2014;Hu et al 2020;Kim et al 2020Kim et al , 2021. So, reasonably improving the external geometry of the side-view mirror can effectively reduce the aerodynamic noise.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on a Generic Side-View Mirror with Slotted Cylindrical Foot

Li²

2023

JAFM

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A simple model consisting of a mirror-housing and its cylindrical foot is applied to represent the automobile side-view mirror that causes unwanted aerodynamic noise and wind drag during high-speed driving. An additional slot is made on the solid foot to modify the flow around the mirror and thus reduce the side wall pressure fluctuation and aerodynamic drag. Flow fields and wall pressure fluctuations of these side-view mirror models have been investigated experimentally in a wind tunnel. The airflow rate through the slot varies with the changing of the slot area. Wall surface pressure sensors, particle image velocimetry (PIV), and six-component balance were applied to measure the acoustic and flow characteristics. The results demonstrated that, with the increase of slot airflow rate to 30%, the side wall pressure fluctuations were reduced by 5.1 dB and the drag coefficient decreased by 10.2%. The PIV measurements showed that the vortex cluster center behind the mirror was moved upward from the wall surface due to the slot airflow injection into the wake. The turbulent kinetic energy in the side-view mirror wake near the wall decreased with the increment of the airflow rate, reducing the side wall pressure fluctuations and thereby suppressing the noise generation.

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Optimization of wind resistance in commercial vehicles with consideration of sunroof buffeting noise

Lu²,

Tang

et al. 2021

AIP Advances

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The aim of this study was to reduce the aerodynamic resistance coefficient of heavy commercial vehicles and buffeting noise that occurs when a sunroof is opened. Computational fluid dynamics was used to establish a numerical simulation model of wind resistance and buffeting noise. Analysis shows that the main influences on aerodynamic resistance are the airflow impact on the roof dome and the wake vortex behind the cab. Sunroof buffeting noise is caused by a low-pressure turbulent vortex generated at the forehead of the cab and falls off at the sunroof. A strategy for reducing the wind resistance coefficient and sunroof buffeting noise is proposed, which involves optimizing the sun visor installation angle and roof dome shape. The optimal strategy is to increase the sun visor installation angle by 4° and use the Scheme 2 roof dome. After optimization, the aerodynamic resistance coefficient of the commercial vehicle was reduced by 2.07% and the sound pressure level of sunroof buffeting noise was reduced by 18.3 dB. Hence, the effect of optimization was obvious. This work provides guidance for reducing drag and buffeting noise in commercial vehicles.

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Prediction and Aerodynamic Analysis of Interior Noise and Wind Drag Generated by the Outside Rear-View Mirror for Commercial Vehicles

Cited by 3 publications

References 27 publications

Methods on Adjusting Vehicle’s Shape to Control Air Resistance

Methods on Adjusting Vehicle’s Shape to Control Air Resistance

Experimental Study on a Generic Side-View Mirror with Slotted Cylindrical Foot

Optimization of wind resistance in commercial vehicles with consideration of sunroof buffeting noise

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