Gai Guanghong
(School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:An improved method for empirical mode decomposition was presented to solve the difficulties of the false modes due to the lower sampling frequency for signals,where the signals were reconstructed before the empirical mode decomposition and the sampling points were added by the interpolation manner to increase the sampling frequency.The improved method was verified in the simulation signals processing,and the abnormal fluctuating in the envelope curves was eliminated successfully,thus,the false modes were restrained.With the aid of the proposed method,the fault modes with clearer physical senses were extracted completely from the original mechanical signals in a practical case£®
Keywords:empirical mode decomposition;improved method;sampling frequency£» fault diagnosis