Aerodynamic noise analysis and optimization for charging pile of electric vehicle
The aerodynamic noise characteristics of the 180 kW high-power DC charging pile under different working conditions were analyzed,and the optimization design was applied for noise reduction of the charging pile.The noise spectrum and sound field distribution of the charging pile were simulated by the multi-step coupling method of computational fluid dynamics(CFD)and computational aeroacoustics(CAA).The test of the charging pile was carried out to verify the accuracy of the simulation.The effectiveness of different noise reduction schemes was compared and analyzed,and the test validation of the schemes was carried out.Results showed that the basic frequency of the charging pile noise was 830 Hz,which coincided with the blade passing frequency of the fan in the power module,and the second peak frequency of the charging pile noise was 650 Hz,which coincided with the blade passing frequency of the system fan.The third and fourth peak frequency amplitudes of the charging pile noise were effectively eliminated by arranging sound-absorbing cotton in the power module air inlet.The overall A-weighted sound pressure level of the charging pile was reduced by about 1.2 dB by arranging sound-absorbing cotton in the system fan outlet.At the same arrangement position,the noise reduction effect of increasing the sound-absorbing cotton thickness was not remarkable while ensuring heat dissipation,and the reduction of the overall A-weighted sound pressure level of the charging pile was less than 1.0 dB.
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