Mechincal Fault Diagnosis Based on High Order Cumulants and HHT
Yijian Huang · Machine Tool & Hydraulics · 2012
The Hilbert-Huang transform can be used to describe the signal frequency and amplitude changes in time domain precisely.The high order cumulant can be used to reduce the Gaussian background noise automatically.In order to analyze the signals of mechanical faults,the advantages of high order spectrum and HHT were combined effectively,intrinsic mode functional components of third-order cumulant were obtained by EMD decomposition,and time-frequency and amplitude-frequency curves were drawn by Hilbert transition.The fault analysis was carried out based on the obtained amplitude-frequency curves.By comparing the experimental results with primitive signals,it proves that the experimental method is feasible and necessary.