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本文根据Lighthill的声模拟理论推导了轿车高速行驶时产生的外部气流辐射声的计算方法。通过风洞试验研究了桑塔纳轿车后视镜产生的脉动压力场的分布情况,测出在相当于90km/h的车速下,作用在车身表面的脉动压力级最大处达132.5dB。最后,用本文导出的计算方法求出了当车速为146km/h时,单由后视镜产生的距轿车中心7.5m处的外部气流辐射声即已超过60dB。
Based on Lighthill’s theory of acoustic simulation, this paper deduces the calculation method of the radiated sound from the external air stream generated by the car at high speed. Through the wind tunnel test, the distribution of the pulsating pressure field generated by the Santana rear-view mirror was studied. The maximum pulsating pressure level at the vehicle body surface was found to be 132.5 dB at the vehicle speed equivalent to 90 km / h. Finally, using the calculation method derived in this paper, it is found that when the speed is 146km / h, the radiated sound of the external airflow generated by the rear-view mirror at a distance of 7.5m from the center of the car exceeds 60dB.