Abstract：A shearer cutting-unit vibrates violently, and it is very difficult to obtain its vibration fault characteristics. In this case, a fault diagnosis method of EMD and energy operator demodulation was proposed. Firstly, the vibration signal characteristics of a shearer cutting-unit will be decomposed into several intrinsic mode functions ( IMFs) by EMD; secondly, in order to obtain a fault characteristic-frequency, some of the intrinsic mode functions were demodulated by an energy operator. Through the experiments in mine, the results showed that the faults of a shearer cutting-unit can be effectively diagnosed by the method, and it is significant to prevent accidents.

Keyword：shearer;empirical mode decomposition;energy operator;fault diagnosis;