1.College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2.College of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410004, China
Abstract：On the basis of failure mechanism of pump and aiming at the difficulty in early fault diagnosis of pump, the fault characteristic signal is weak and the traditional envelope analysis need to to determine frequency bandwidth rely on experience. A fault diagnosis approch based on empirical mode decomposition(EMD) and envelope spectrum is proposed. According to the method, the vibration signal is decomposed into some intrinsic mode function (IMF) using EMD at first.Then the first IMF is envelope analyzed and the envelope spectrum is obtained which include the main fault information. Finally, the working conditions and fault types of the pump is determined by the analysis of the envelope spectrum. The experimental results show that the early fault characteristics of the pump is extracted effectively and four modes of no fault, slipper loosing fault, swashplate wearing fault and valve plate wearing fault are correctly identified.
2012, Vol. 31 
