Diagnosis method for initial failure of gearbox of wind generating set based on vibration monitoring

Abstract

The invention provides a diagnosis method for an initial failure of a gearbox of a wind generating set based on vibration monitoring. The method comprises the following steps: firstly, collecting an original vibrating acceleration signal of each monitoring point of the gearbox of the wind generating set; adopting an LMD (Local mean decomposition) method for decomposing the original vibrating acceleration signal into a plurality of PF (Product function) components with certain physical significances; selecting the PF components containing failure information, such as amplitude modulation and frequency modulation, for reconstructing a signal; performing Hilbert conversion on the reconstructed signal and further extracting fault characteristic quantity; lastly, judging the fault type and the fault degree by calculating a KL-divergence value between a to-be-tested sample and a standard sample.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for early fault diagnosis of rotating machinery based on vibration monitoring, in particular to a method for early fault diagnosis based on vibration monitoring and applied to a gearbox of a wind power generating set. Background technique [0002] As a renewable and non-polluting new green energy, wind energy has been widely regarded as a new energy utilization method with great development and utilization prospects at home and abroad. In the current situation of increasingly severe energy shortage in the world, vigorously developing wind power technology is an effective way and one of the inevitable trends to solve the problems of energy shortage and environmental pollution. In 2013, in China (excluding Taiwan), the new installed capacity was 16088.7MW, a year-on-year increase of 24.1%; the cumulative installed capacity was 91412.89MW, a year-on-year increase of 21....

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the shortcoming that the current early fault diagnosis method of the gearbox of the wind power generating set is not timely and accurate enough, and performs vibration monitoring on the gearbox of the wind generating set, and proposes a method for early fault diagnosis of the gearbox of the wind power generating set. The method includes the following steps:

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