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《Mechanical Science and Technology for Aerospace Engineering》 2008-06
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Automatic Identification of the Axis Oribt Shape of a Rotor

Wang Yankai,Liao Mingfu,Wu Bin(College of Power and Energy,Northwestern Polytechnical University,Xi′an 710072)  
We propose a Fourier descriptors based algorithm for automatically identifying axis orbit shape of rotating machinery.Firstly,a new function is designed to describe the axis orbit shape,which is based on the distance between every sample point of the orbit and the center of gravity,and the sign of the second order derivative of waveform on two directions.Then the Fourier descriptors of the above function are extracted to represent the shape of axis orbit.In addition,we prove that the proposed descriptor is scale,shift and rotation invariant.Through analyzing the dynamic characteristic of six typical axis orbit shapes,we demonstrate that the proposed descriptor can effectively reflect the fault mechanism.Finally,we adopt the naive Bayesian classifier to recognize the axis orbit shape.Experiment results show the effectiveness of this algorithm.
【CateGory Index】: TP274
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【Citations】
Chinese Journal Full-text Database 5 Hits
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【Co-citations】
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