A new type of wavelet-Exponential Damping Wavelet is constructed to detect the knocking sound caused by mechanical faults in an engine, Experimental results show that by this wavelet effective features of those faults can be extracted from noise signal.

• 为了识别发动机噪声信号中表徵故障的间歇性撞击声，本文构造的一种新型的小波－指数衰减型小波函数，它能有效地识别出间歇性撞击声。