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Planetary reducer external interference suppression method based on wavelet threshold

A planetary reducer and external interference technology, applied in the field of planetary reducer vibration data processing, can solve the problems of vibration data being easily affected by external interference and measurement noise, and difficulty in judging fault characteristics, so as to suppress the influence of random interference and improve the The effect of precision

Inactive Publication Date: 2021-05-14
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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  • Abstract
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the planetary reducer indicates that the vibration data collected by the vibration sensor is easily affected by external interference and measurement noise, which in turn makes it difficult to judge the fault characteristics of the planetary reducer through the vibration monitoring signal of the planetary reducer. It is to provide a method for suppressing external interference of planetary reducer based on wavelet threshold, which solves the problem of effectively removing the influence of external interference and measurement noise, so that the fault characteristics of planetary reducer in the vibration monitoring signal can be identified in time and accurately

Method used

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  • Planetary reducer external interference suppression method based on wavelet threshold
  • Planetary reducer external interference suppression method based on wavelet threshold
  • Planetary reducer external interference suppression method based on wavelet threshold

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Embodiment 1

[0036] Embodiment 1 is a method for suppressing external interference of a planetary reducer based on wavelet threshold, which mainly solves the problem that the vibration signal of the bearing is susceptible to noise interference. First, the bearing vibration signal is decomposed by wavelet to obtain the wavelet coefficients of each decomposition layer; then the wavelet coefficients of low-frequency signals (ie, wavelet approximation coefficients) are retained, and the wavelet coefficients of high-frequency signals (ie, wavelet detail coefficients) are hierarchically adaptive. processing; finally, wavelet reconstruction is performed on the thresholded wavelet coefficients to obtain the noise-reduced signal. By constructing a hierarchical adaptive threshold function which is continuous at the threshold and differentiable in the wavelet domain, the defects of traditional threshold function reconstruction bias and excessive noise reduction can be improved. The noise reduction ex...

Embodiment 2

[0053] This embodiment 2 is based on the embodiment 1, and the overall implementation process of the planetary reducer external disturbance suppression method based on the improved wavelet threshold is as follows figure 1 As shown, the implementation process of improving wavelet threshold based on cross-correlation coefficient is as follows figure 2 shown.

[0054] Arrange two vibration sensors on the outer surface of the planetary reducer. The vertical direction of the two vibration sensors forms a certain angle An=90°. They are respectively arranged on the surfaces of two adjacent gear boxes of the planetary reducer to collect Surface vibration monitoring data such as image 3 shown.

[0055] Select an appropriate discrete wavelet basis function Ke as "sym3", determine the number of discrete wavelet decomposition layers Le = 3, and perform multi-layer discrete wavelet decomposition on the original data of the sensor, such as Figure 4 shown.

[0056] According to δ=σ×[(...

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Abstract

The invention discloses a planetary reducer external interference suppression method based on a wavelet threshold. The method comprises the following steps: obtaining the vibration data of the surfaces of two adjacent gearboxes of a planetary reducer, namely first vibration data and second vibration data; performing multilayer discrete wavelet decomposition to obtain a first wavelet detail coefficient, a first wavelet approximation coefficient and a second wavelet detail coefficient; carrying out adaptive wavelet threshold processing on the wavelet detail coefficients to obtain wavelet detail coefficients of each layer after threshold processing; and performing wavelet reconstruction on the first wavelet approximation coefficient and the wavelet detail coefficient of each layer after threshold processing, wherein the reconstructed data is the data after external interference suppression. According to the method, the problem that an adaptive wavelet threshold method is easy to cause over-suppression or insufficient suppression is solved, the wavelet detail coefficient characteristics of the vibration data with relatively high cross-correlation degree are kept while the random interference influence is effectively suppressed, and the precision of state monitoring and fault diagnosis of the planetary reducer is improved.

Description

technical field [0001] The invention relates to the technical field of planetary reducer vibration data processing, in particular to a method for suppressing external disturbance of a planetary reducer based on wavelet threshold. Background technique [0002] Fusion energy is considered to be a clean energy that may permanently solve human energy problems. It has many advantages such as almost unlimited resources and no radioactive nuclear waste. In order to realize nuclear fusion, humans have carried out a large number of scientific experiments, but up to now, no controllable and sustained fusion reaction has been achieved and the energy released by it exceeds the energy consumed by the facilities that manufacture and control nuclear fusion reactions, and further research is needed. Research and develop related technologies. [0003] In terms of realizing nuclear fusion, there are currently two mainstream methods: one is plasma magnetic confinement (MCF), such as the Inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G01M13/02G01M13/028
CPCG01M13/02G01M13/028G06F2218/06
Inventor 刘维新叶超余纬薛宝珠郭英杰梁为育
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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