Needling machine transmission mechanism vibration signal feature extraction method

A vibration signal, transmission mechanism technology, applied in the testing of machine/structural components, testing of mechanical components, measuring devices, etc., can solve modal confusion, discontinuous points of hard threshold function discontinuity, constant deviation of soft threshold function, etc. question

Inactive Publication Date: 2019-11-26
SHANDONG UNIV OF TECH
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Problems solved by technology

[0007] The exponential wavelet threshold function processes the wavelet coefficients smaller than the threshold and the wavelet coefficients larger than the threshold, which solves the problem that the hard threshold function is discontinuous and has discontinuous points in the entire wavelet domain, reduces the variance of the noise reduction signal, and...

Method used

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  • Needling machine transmission mechanism vibration signal feature extraction method
  • Needling machine transmission mechanism vibration signal feature extraction method
  • Needling machine transmission mechanism vibration signal feature extraction method

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Embodiment Construction

[0056] attached figure 2 Middle: 1. Horizontal measuring point 2. Vertical measuring point 3. Axial measuring point.

[0057] 1. Signal acquisition

[0058] The acceleration sensor is used to collect the vibration signal of the transmission mechanism of the acupuncture machine. The sensor used in this application is a DH186IEPE piezoelectric acceleration sensor with a sensitivity of 0~10mV / ms -2 , range is 500m / s 2 , frequency range 0.5~5kHz. The acquisition box is DH-5923 dynamic signal test analyzer from Donghua Testing Company. Acceleration sensors are arranged in three directions, namely horizontal direction, vertical direction and axial direction. The axial direction is to detect the centering degree of the transmission mechanism of the acupuncture machine, and the signals in the horizontal and vertical directions reflect the fault characteristics of the transmission mechanism of the acupuncture machine.

[0059] 3. Endpoint processing of the signal using the autoc...

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Abstract

The invention provides a needling machine transmission mechanism vibration signal processing method based on combination of MEEMD and an exponential wavelet threshold. The needling machine transmission mechanism vibration signal feature extraction method comprises the steps of: carrying out endpoint continuation processing on an acquired needling machine transmission mechanism vibration signal byadopting a waveform matched self-adaptive endpoint continuation method; performing wavelet decomposition, and denoising and reconstructing the acquired signal by utilizing an exponential wavelet threshold function to obtain the denoised signal; performing envelope line fitting on the denoised vibration signal by adopting a cubic B-spline method, and then carrying out MEEMD decomposition on the signal to obtain cross correlation coefficients and kurtosis values of a plurality of IMF components and the denoised signal; performing correlation analysis on the IMFs and the original signal to selectthe useful IMF; and finally performing Hilbert transform on the IMF components to obtain a Hilbert spectrum of the signal, and regarding the Hilbert spectrum as a signal feature of the needling machine transmission mechanism vibration signal. The needling machine transmission mechanism vibration signal feature extraction method is suitable for fault diagnosis of a needling machine transmission mechanism in the industrial field.

Description

technical field [0001] This application proposes a method for processing fault characteristic signals of transmission mechanisms of acupuncture machines based on the combination of MEEMD and exponential wavelet thresholds, which is suitable for fault diagnosis of transmission mechanisms of acupuncture machines in the mechanical field. Background technique [0002] With the continuous application of new technologies and materials, various technical performances of domestic needle looms have been greatly improved, but the basic principle is the same, that is, the needle plate equipped with needles is driven by the eccentric wheel linkage mechanism to operate. Reciprocate up and down to achieve the purpose of reinforcing the processed fiber web. The difference lies in the reciprocating positioning mechanism of the needle plate and the needle plate beam. In the design of domestic high-frequency acupuncture machines, there are mainly two types of mechanisms: one is the spindle bo...

Claims

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Application Information

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IPC IPC(8): G01M13/028
CPCG01M13/028
Inventor 许同乐张亚靓孟祥川纪俊卿张静
Owner SHANDONG UNIV OF TECH
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