Fault diagnosis method for condition-variable planetary gear box based on multi-sensor information fusion

Abstract

The invention belongs to the technical field of fault diagnosis of rotary machines, and relates to a fault diagnosis method for a condition-variable planetary gear box based on multi-sensor information fusion, especially to a fault diagnosis method suitable for the condition-variable complex wind power planetary gear box. The method comprises the following steps that (1) according to the structural characteristic and diagnosis difficulty of the planetary gear box, proper vibration measuring point positions and sensor types are selected, and a collection scheme is made; (2) according to the order reconstruction technology, vibration signals are preprocessed, nonlinear non-smooth time domain signals are converted into smooth angle domain signals, and non-smooth vibration time-domain signals sampled in equal time interval are converted into angle domain vibration signals with smooth feature; (3) information of multiple sensors is fused; (4) faults of the planetary gear box are divided into distributed faults and local faults; (5) fault modes are identified; and (6) verification is carried out. According to the diagnosis method, the accuracy of a diagnosis result is high, and the practicality 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 fault diagnosis method for planetary gearboxes with variable working conditions based on multi-sensor information fusion, and is especially suitable for the fault diagnosis method for planetary gearboxes with variable working conditions and complicated wind power. Background technique [0002] Planetary gearboxes have the characteristics of large transmission ratio, strong carrying capacity and high transmission efficiency, and are widely used in large and complex mechanical equipment such as wind power generation and helicopters. The harsh working environment is likely to cause failures of key components such as sun gears, planetary gears and ring gears. However, the planetary gearbox is different from the traditional gearbox with a fixed central shaft rotation. The gear movement in the planetary gearbox is a typical compound motion, a...

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Problems solved by technology

Harsh working environment is prone to failure of key components such as sun gear, planetary gear and ring gear

However, the planetary gearbox is different from the traditional gearbox with a fixed central shaft rotation. The gear movement in the planetary gearbox is a typical compound motion, and its vibration response is more complicated than that of the traditional gearbox. It is more difficult to diagnose and identify faults. The fault diagnosis method of traditional gearbox is difficult to be directly applied to the fault diagnosis of planetary gearbox

At the same time, the vibration signal measured by the sensor on the planetary gearbox is the coupling of multiple meshing vibrations. Different sensor measurement points will provide different sensitivities or complementary information. It is difficult to use a single sensor information to diagnose the planetary gearbox. very big

The fault diagnosis of the gearbox is mainly based on the analysis of the vibration signal. The dimension index of the time domain signal can well describe the fault information of the mechanical vibration and is sensitive to the fault characteristics, but its value will increase with the development of the fault and will also Changes due to changes in working conditions (such as load, speed, etc.), are easily disturbed by the environment, and the performance is not stable enough

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