Abstract: A large number of information related to the running state of the rotating shaft is contained in the torsional deformation signal of the shaft. Reasonable method can get more effective signal components, it can help to make correct judgement on the working state of the shaft. Compared with the traditional denoising method, the method based on EMD has a strong adaptability. Effective signal is recovered from the original signals collected from two mutually orthogonal directions, after being filtered outnoise according to the correlation of EMD decomposition. The simulation results show that the method is effective and can be used to the actual rotating shaft to reduce the distortion of the signal.

Key words: Shaft, Torsional deformation, Measurement, Phase difference, EMD, Noise reduction