Wind power gear box fault diagnosis method

Abstract

The present invention provides a wind power gear box fault diagnosis method which aims to solve the problem in the prior art that the fault information is very difficult to detect at the operation of a gear box. When the gear box goes wrong, a vibration signal of the gear box has two characteristics: 1 a fault signal is weaker and is easy to inundated by other signals; 2 the fault signal generates a modulation phenomenon because of the fault impact. The wind power gear box fault diagnosis method of the present invention applies the ensemble empirical mode decomposition (EEMD) and a Hilbert square demodulation technology respectively to solve the above two problems. Firstly, by applying the EEMD, an original vibration signal is decomposed into a series of intrinsic mode functions (IMF), in the IMFs, the IMF having the maximum kurtosis value usually corresponds to a Fault feature component; and then the Hilbert square demodulation is utilized to demodulate the IMFc, and the spectral analysis is carried out on the demodulated signal, and finally, a spectral analysis result is compared with the rotation frequencies of the rotation parts of the gear box to determine a fault position.

Description

technical field [0001] The invention relates to a fault diagnosis method for a wind power gearbox, in particular to a fault diagnosis method for a wind power generator gearbox. Background technique [0002] Most of the wind turbines are installed in the Gobi Desert, islands, high mountains and other tuyeres. The natural conditions are harsh, coupled with the instability of the airflow, the wind turbines work under complex alternating loads for a long time, and the failures of the turbines occur from time to time. The failure statistics show that the gearbox is the component with the highest failure rate in wind turbines, accounting for more than 60%. In addition, the installation location of wind turbines is inconvenient for transportation, and the gearbox is installed on the top of a tower 70-100 meters away. The space is small. If the fault is not detected in time, it is easy to cause damage to the wind turbine gearbox. It needs to be removed from the tower, the cost of h...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a fault diagnosis method for a wind power gearbox, aiming to solve the problem in the prior art that it is difficult to detect fault information when the gearbox is running

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