Under the effect of side wind,the aerodynamic noise value inside the vehicle will increase significantly.To re-duce the aerodynamic noise inside the passenger car under the effect of side wind.This paper takes an SUV as the research object.Computational fluid dynamics is used to calculate the external flow field of the whole vehicle to obtain the surface pressure and velocity of the passenger car.The vehicle model is rotated counterclockwise by 10 degrees to simulate the side wind.According to the results of the flow field calculation,the aerodynamic noise inside the vehicle is calculated based on the finite element analysis of the Lighthill acoustic analogue method.And the wind tunnel test is used to verify the cor-rectness of the calculation results.By optimizing the design of the A-pillar and chassis at two places.The calculation re-sults of interior noise after optimization are compared and analyzed with those before optimization.The analysis shows that:improve the curvature of the surface of the A-pillar,make the surface of the A-pillar part of the structure parallel to the front windshield,and set its width to 10 mm,the sound pressure level in the middle and high frequency bands inside the car is reduced by about 1.08 dB(A),and the clarity of speech is improved by 1.78％;add a rectangular tooth air dam in the chassis of the car.The sound pressure level in the middle and high frequency bands is reduced by about 0.55 dB(A).Speech intelligibility is improved by 0.33％.
side windsaerodynamic noisecomputational fluid dynamicsnoise optimization
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