【摘要】 在往复滑动试验机上作了金属摩擦噪声试验,试验期间同时测量了摩擦噪声、摩擦振动三维加速度和名义摩擦力等动态信号,这些信号含有与摩擦振动激励源有关的信息。应用小波变换技术对这些信号进行了分解,在对应摩擦振动主频的小波分解细节分量中,可以清楚地看出激励摩擦振动的摩擦力动态分量,从而说明了摩擦噪声是由波动变化的摩擦力所引发。更多还原

【Abstract】 A series of the tests on squeal formation are carried out using a flat specimen rubbed against a ball specimen. The sound pressure level of squeal, 3-dimensional vibration accelerations of the specimen and nominal friction force are recorded during testing, which probably contain the messages on the cause to excite squeal. These signals are decomposed and analyzed using the wavelet transform technique. In the wavelet decomposing details, which correspond to the dominant frequency of the nominal friction force and inertial force, the fluctuation of the friction force is seen clearly. That demonstrates that squeal is caused by a varying friction force.更多还原