Abstract
To shorten the measurement period and reduce experiment costs, we investigated the parameter conversion between the experiment results of the controlled pass-by (CPB) method and alternative close proximity (A-CPX) method for automotive applications. The CPB and A-CPX methods were used to experiment with tire noise. The correlation between the tire noises of the two experimental methods was analyzed. Then, the quantitative transformation relationship between the tire noises of the two methods was obtained using an acoustic radiation propagation experiment in the semi-free field. The results indicate a good linear correlation between the experimental results of the two experimental methods. In the case of ignoring the shielding effect of the car body, the average difference between the measured value of the CPB method and the predicted value of the experimental tire is about 1.1 dB. When considering the shielding effect of the car body, the average difference between the measured value of the CPB method and the predicted value of the experimental tire is about 2.7 dB.
Highlights
The rapid growth in the number of motor vehicles has increasingly worsened road traffic noise pollution, which seriously threatens people’s everyday lives and physical and mental health
The on-board experiment mainly includes on-board sound pressure (OBSP), trailer coast-by (TCB), close proximity trailer (CPX), and on-board sound intensity (OBSI)
The results showed that the test results of OBSI and PBN are linearly related, and the wind noise affects the test of the trailing edge
Summary
The rapid growth in the number of motor vehicles has increasingly worsened road traffic noise pollution, which seriously threatens people’s everyday lives and physical and mental health. When a vehicle is driving on the road, the traffic noise caused by the vehicle is mainly composed of engine noise and tire noise. Reducing tire noise is important for reducing the overall noise of the vehicle and controlling noise pollution [2]. Tire noise experiments are important for developing a low-noise tire. According to the experiment environment, the existing tire noise experiment methods can be divided into roadside, on-board, and laboratory experiments. The representative roadside experiments are coast-by (CB), statistical pass-by (SPB), and controlled pass-by (CPB). Laboratory drum (DR) is the most widely used laboratory tire noise experiment. The selection of measurement method should be based on available equipment, measurement objectives, and experiment environment [2]
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