Composite fault diagnosis method and system of gear case

A composite fault and diagnosis method technology, applied in the direction of machine gear/transmission mechanism testing, etc., can solve problems such as wrong judgment of gear running status, achieve fast calculation speed, high extraction and recognition ability, and avoid sudden accidents.

Active Publication Date: 2013-02-20
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

If the center frequency and bandwidth are not selected properly, it may lead to wrong judgment on the gear running state

Method used

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  • Composite fault diagnosis method and system of gear case
  • Composite fault diagnosis method and system of gear case
  • Composite fault diagnosis method and system of gear case

Examples

Experimental program
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Embodiment Construction

[0045] Take the fault of wind power generator gear box as example below, the present invention is described in detail:

[0046] see figure 1 , a gearbox compound fault diagnosis method, comprising the steps of:

[0047] (1) The acceleration vibration sensor is used to pick up the vibration signal of the gearbox, and the acceleration sensor is installed on the end cover of the input shaft of the gearbox to be tested.

[0048] In this embodiment, the output shaft speed of the wind power generating set is measured to be 495r / min (the rotation frequency is 8.25Hz), the number of teeth of the pinion gear of the gearbox is 20, the number of teeth of the large gear is 151, the transmission ratio is 0.132, and the rotation frequency of the pinion gear is 8.25Hz. The meshing frequency of the fan gearbox is 165Hz. During the operation of the fan, the gearbox vibrates violently. An acceleration vibration sensor is used to pick up the vibration signal of the gearbox. The acceleration s...

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Abstract

The invention discloses a composite fault diagnosis method and system of a gear case. The composite fault diagnosis method comprises firstly measuring and storing vibration signals of the gear case; then adopting 1/4 sampling translation dual tree complex wavelet transform for resolving; and finally extracting a plurality of fault characteristics by adopting an energy operator demodulation method in a plurality of sub-band signals obtained by resolving, and further identifying a composite fault mode. The composite fault diagnosis method is fused with a complementary characteristic using dual tree complex wavelets and energy operator demodulation, and the obtained gear case is high in recognition capability of composite fault characteristic extraction. By means of speed capability of parallel realization of the dual tree complex wavelet transform and the energy operator demodulation method, partial polling and on-line monitoring of the gear case in a working condition can be completely applied, sudden accidents can be avoided, and the composite fault diagnosis method and system can be applicable to gear case portions in different models.

Description

technical field [0001] The invention relates to the field of gearbox fault detection, in particular to a gearbox composite fault diagnosis method and system. Background technique [0002] Due to its fixed transmission ratio, large transmission torque and compact structure, the gearbox has become a commonly used variable speed transmission component and has been widely used in various mechanical equipment. Since gears are often operated under harsh environmental conditions such as high speed, heavy load and strong impact, various failures such as wear, fatigue, broken teeth and cracks are prone to occur, and further induce other failures, resulting in huge economic losses. Therefore, it is of great engineering significance to monitor the operating state of the gearbox and identify its faults in time. [0003] During the gear operation, faults such as gear manufacturing and installation errors, peeling, and cracks will directly become the excitation source of vibration. These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/02
Inventor 王衍学向家伟蒋占四杨晓清
Owner GUILIN UNIV OF ELECTRONIC TECH
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