Side-View Mirror Vibrations Induced Aerodynamically by Separating Vortices

Ogawa, Satoshi; Kawate, Taiki; Takeda, Jumpei; Omori, Ittetsu

doi:10.4236/ojfd.2016.61004

Cited by 1 publication

(1 citation statement)

References 5 publications

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“…Based on the hybrid computation method, Xu [19] studied aerodynamic noises of the rear view mirror, and completed sound pressure frequency spectrum computation of observation points through coupled solution between flow fields and sound fields. Ogawa [20] has used CFD simulation technology to clarify the vibration modes of side-view mirror experimentally and to capture forces on the mirror surface induced by separating vortices around the mirror numerically. Eddies behind the rear view mirror would exert serious effects on noise inside an automobile.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation and experimental test on aerodynamic noises of the bionic rear view mirror in vehicles

Wan¹,

Ma²

2017

J. vibroeng.

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At present, there are some researches focusing on optimization of aerodynamic noises on rear view mirrors, but researches on bionic noise reduction of rear view mirrors are rarely reported. Therefore, with an original rear view mirror as the basic model, the paper applied a head convex hull of a dung beetle to the original rear view mirror cover to obtain a bionic rear view mirror, then conducted numerical computation for aerodynamic noises of the bionic rear view mirror and compared the computational results with the original model. Finally, in order to verify correctness of computational results of aerodynamic noises of the rear view mirror, wind tunnel test was conducted on the rear view mirror. Experimental and numerical simulation results were highly consistent in the whole frequency band, so the wind tunnel test could be replaced by numerical simulation. Only one obvious vortex was behind the bionic rear view mirror, but two obvious vortexes with the opposite rotation directions were behind the original rear view mirror. The bionic rear view mirror did not present vortexes near the lateral window, so impacts of vortexes on noises in the vehicle could be eliminated effectively. Pressure difference in front of and behind the bionic view mirror was smaller than the pressure difference in front of and behind the original rear view mirror. Pressure resistance caused by the convex structure outside the rear view mirror was reduced, so noise reduction could be promoted. The convex structure mainly affected the aerodynamic noise in mid-high frequency regions. Compared with the original rear view mirror, noise reduction effects of the bionic rear view mirror were obvious, where the noise reduction amplitude reached 10dB. Noise source size and intensity of the bionic rear view mirror were reduced obviously.

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Section: Introductionmentioning

confidence: 99%