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Planetary gearbox weak shock component extraction method

A planetary gearbox and extraction method technology, which is applied in the direction of machine gear/transmission mechanism testing, measuring devices, instruments, etc., can solve the problems of easy submersion, weak impact components, inability to accurately identify the impact frequency band, etc. The effect of obvious features and precise positioning

Active Publication Date: 2017-10-20
苏州微著设备诊断技术有限公司
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  • Application Information

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Problems solved by technology

However, in the early weak faults, the impact components are usually weak and easily submerged in noise and rich smooth modulation signals, so the SK method cannot accurately identify the impact frequency band

Method used

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  • Planetary gearbox weak shock component extraction method
  • Planetary gearbox weak shock component extraction method
  • Planetary gearbox weak shock component extraction method

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0025] Such as figure 1 As shown, a method for extracting weak impact components of a planetary gearbox includes the following steps:

[0026] Step 1: The original vibration signal x(t) of the planetary gearbox is sampled at high frequency by the vibration acceleration sensor. The sampling frequency is 20KHz. The fault type of the gearbox is pitting of the planetary gear. The structure diagram of the planetary gearbox is as follows figure 2 , its structural parameters and fault characteristic frequency are as follows: input speed f n =3000rmp, number of sun gear teeth: z 1 =12, planetary gear teeth number: z 2 =48, number of ring gear teeth: z 3 =108, characteristic frequency of sun gear failure: f 1 =45Hz, characteristic frequency of planetary gear failure: f 2 =11.25Hz, ring gear fault characteristic frequency: f 3 = 5Hz;

[0027] S...

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Abstract

The invention relates to a planetary gearbox weak shock component extraction method. According to the method, a DRS (discrete random separation) method is utilized to separate abundant smooth and steady modulation components from original vibration signals, so that the signal-to-noise ratio of the frequency bands of shock signals is improved; residual signals are obtained; an SK (Spectral Kurtosis) method is adopted to identify the optimal shock frequency band of the residual signals, a center frequency band and a filter bandwidth parameter are obtained; a filter is designed according to the parameter; the filter filters the residual signals; envelope analysis is carried out; and therefore, the identification and diagnosis of a fault of a planetary gearbox are realized. Compared with a method using spectral kurtosis to identify a shock frequency band, the method can locate the optimal frequency band more accurately, make shock characteristics in filter time-domain signals more prominent, make a fault frequency in an envelope spectrum more prominent and can effectively and accurately locate the fault source of the planetary gearbox.

Description

technical field [0001] The invention relates to the technical field of planetary gearbox fault diagnosis, in particular to a method for extracting weak impact components of a planetary gearbox. Background technique [0002] The planetary gear transmission mechanism has the advantages of small size, light weight and large transmission ratio, so it is widely used in aerospace, wind power and other large and complex mechanical equipment. The harsh working environment with low speed and heavy load often leads to serious wear and fatigue cracks of sun gears, planetary gears and other key components, seriously affecting the reliability of mechanical equipment and burying major safety hazards. Due to the special structure and complex working conditions of the planetary gearbox, its vibration response is characterized by strong nonlinearity, non-stationarity, and multi-mode confusion. There is nothing to do, so the research on its fault diagnosis has always been a hot and difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/02
CPCG01M13/021G01M13/028
Inventor 王琇峰王九龙
Owner 苏州微著设备诊断技术有限公司