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Characterization of Buffeting Noise Through a Rear Window in an Automobile Using LBM

격자 볼츠만법을 이용한 자동차 뒷 창문 버페팅 소음 특성해석

Lee, Songjune;Choi, Hyunggyu;Cho, Munhwan;Ih, Kang-duck;Cheong, Cheolung
이송준;최형규;조문환;이강덕;정철웅

  • Received : 2015.09.03
  • Accepted : 2015.10.07
  • Published : 2015.10.20

Abstract

Buffeting noise through a rear window in an automobile is investigated by using lattice Boltzmann method. The generation mechanism of the buffeting noise can be understood as the resonance mechanism in a Helmholtz resonator, which is driven by the convecting vortex in a shear-layer flow over the neck of the resonator. Two methods to suppress the buffeting noise are proposed, and their effects are quantitatively assessed. Opening front window reduces the observed buffeting tonal noise by 25 dB and the overall SPL by 4 dB, and the installation of a Helmholtz resonator acting as a dynamic damper reduces the tonal component that by 35 dB and the overall SPL by 10 dB.

Keywords

Lattice Boltzmann Method;Buffeting Noise;Helmholtz Resonator;Cavity

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Cited by

  1. Decomposition of Surface Pressure Fluctuations on Vehicle Side Window into Incompressible/compressible Ones Using Wavenumber-frequency Analysis vol.26, pp.7, 2016, https://doi.org/10.5050/KSNVE.2016.26.7.765

Acknowledgement

Grant : 첨단 기계부품소재 인력양성사업단