Analyses of the Distribution Characteristics of Aerodynamic Energy and Acoustic Energy in Sunroof Wind Buffeting Noise

doi:10.3901/JME.260196

Abstract

Abstract: Due to the strong coupling relationship between acoustic energy and aerodynamic energy in wind buffeting noise and the inconsistent subjective perception of these two energies by passengers, different control methods are required. Additionally, in turbulent flow, there are intense random pulsating velocities, which can mask the flow characteristics of pulsating velocities closely related to automotive wind buffeting noise. Therefore, it is necessary to introduce the Wavenumber Frequency Spectrum Separation (WFS) to decouple the acoustic energy and aerodynamic energy in wind buffeting noise in order to further explore the energy characteristics of these two types. First, wind tunnel tests were carried out to verify the accuracy of numerical simulations. Then, traditional flow field analysis was used to explore the flow characteristics of sunroof wind buffeting noise. It was found that the flow field exhibited rich random velocity pulsations, which could mask the potential characteristics of pulsating velocities closely related to wind buffeting noise. Therefore, WFS was introduced to decouple these two energies, and their characteristics were further analyzed in one-dimensional and two-dimensional wavenumber spectra. The results showed that when sunroof wind buffeting noise occurred, both the acoustic energy and aerodynamic energy at the sunroof resonated at f = 15.15 Hz, which is the first-order resonance frequency of wind buffeting noise. Inside the passenger compartment, only the acoustic energy resonated at f = 15.15 Hz. Furthermore, at f = 15.15 Hz, the acoustic energy inside the passenger compartment was much higher than the aerodynamic energy, with a difference of 20.26 dB. This indicates that the pressure pulsations inside the passenger compartment can reflect the spatial distribution characteristics of acoustic energy. However, this is not the case at the sunroof, as the peak difference between the acoustic energy and the aerodynamic energy is only 7.48 dB.

Key words: sunroof wind buffeting noise, aerodynamic energy, acoustic energy, wavenumber decoupling, distribution characteristics

CLC Number:

TH128

CAO Sishi, ZHANG Zhifei, HE Yansong, XU Zhongming. Analyses of the Distribution Characteristics of Aerodynamic Energy and Acoustic Energy in Sunroof Wind Buffeting Noise[J]. Journal of Mechanical Engineering, 2025, 62(6): 325-336.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260196

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