Divergence-index-based fault diagnosis method of variable-working-condition wind-power planetary gearbox

Abstract

The invention, which belongs to the technical field of the rotation machinery fault diagnosis, especially relates to a divergence-index-based fault diagnosis method of a variable-working-condition wind-power planetary gearbox, wherein the method is especially suitable for the fault diagnosis field of the variable-working-condition wind-power planetary gearbox. The method comprises: on the basis of an order ratio re-sampling technology, pretreatment is carried out on a vibration signal collected by the variable-working-condition wind-power planetary gearbox sensor and a non-linear and non-stable time-domain signal is converted into an angular-domain signal with stability; because the planetary gearbox with the structural characteristics and diagnosis difficulties is different from the traditional fixed-shaft gearbox, faults of the planetary gearbox are graded and are diagnosed; a fault characteristic set is extracted; a fault diagnosis parameter is obtained; and then an experiment is carried out for verification. According to the invention, the non-stable characteristic of the vibration signal can be avoided and the fault characteristic order ratio can be identified effectively and clearly; the J-divergence and the KL-divergence can represent fault generation positions and types of the planetary gearbox; and when a fault occurs, a fault diagnosis can be carried out based on mutual assistance and the sensitivity is high.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of rotating machinery, and in particular relates to a method for fault diagnosis of a wind power planetary gearbox under variable working conditions based on a divergence index, and is particularly suitable for the field of fault diagnosis of wind power planetary gearboxes under variable working conditions. Background technique [0002] Planetary gearboxes are widely used in wind turbines. In actual operation, planetary gearboxes not only bear the influence of dynamic heavy loads, but also frequently change operating conditions, making them extremely prone to failure during operation. Key components such as sun gears, planetary gears, and ring gears are prone to damage and failure, which has a huge impact on the gearbox. Therefore, it is very important to carry out detection and diagnosis to ensure the safe, efficient and stable operation of wind turbines. However, the time-synchronous av...

AI Technical Summary

Problems solved by technology

Usually the inner ring gear is fixed, and the sun gear rotates around its own central axis, while several planetary gears not only rotate around their own central axis, but also revolve around the central axis of the sun gear, and mesh with the sun gear and the ring gear at the same time. The typical compound motion of gear motion makes its vibration response more complicated than that of fixed shaft transmission gearbox, so it will be more difficult to carry out corresponding fault diagnosis for planetary gear

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