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| An investigation into fault diagnosis of hydro-turbine unit based on EMD multifractal spectrum |
| XUE Yan′gang |
| School of Electrical Engineering, Lanzhou Institute of Technology, Lanzhou, Gansu 730050, China |
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Abstract To diagnose faults in of a hydro-turbine unit accurately and precisely, a fault diagnosis model for vibration signal of hydropower units is built based on the EMD, multi-fractal spectrum and improved BP neural network in this paper. A series of vibration signals under various conditions, such as normal rotor system, oil film whirl in bearings, rotor imbalance, and rotor misalignment etc. are acquired from a hydro-turbine unit. At first, the EMD components of these vibration signals are obtained through empirical mode decomposition. Then the waveform samples are extracted by using EMD coefficients according to the signal waveform tendency curves. Thirdly, the eigenvalues alpha(q)and f(q), are extracted from the waveform samples by means of multifractal spectrum algorithm. Finally, the eigenvectors are input into a BP network for classification and recognition. The trained neural network is applied to all the samples and the test accuracy is 100%. The results show that the multi-fractal spectrum not only is feasible for fault diagnosis of hydropower unit but also can improve the precision of diagnosis and enhance human-computer interaction.
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Received: 14 December 2015
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