车内次声的试验研究

文中论述了车内次声的发生机理，并用实测法研究了车内次声的规律性。结果表明，在车内声波的总能量中，次声波的能量占主要成分，听声的能量所占比例极小。随着车的提高，车内次声总声压级也相应提高，120km/h时，开右前窗时次声总声压级达到121dB（IL），闭窗时次声总声压级达到114dB（IL）。次声的声压级峰值频率范围是1．5－9Hz，未发现明显的共振频率和谐波。

An Investigation of Inner Infrasound of Vehicles

In this article, the causes of inner infrasound of vehicles are introduced and the laws of inner infrasound of vehicles are studied using on-the-spot survey. The results show that the energy of infrasound makes the biggest occupation of the total energy of sound in a vehicle, of which the energy of audible sound plays a small part. With the enhancement of the vehicle's velocity, the whole sound pressure level also rises. At the speed of 120km/h, the whole sound pressure level infrasonic rises up to 121dB(IL) when the right-front window opened. When the windows are closed, the whole sound pressure level is up to 114dB(IL). The summit frequency of infrasonic pressure level ranges from 1.5 to 9 Hz. No proof shows the apparent resonance frequency and harmonic.