A vibration signal frequency feature extraction method based on eemd, cmf, wpt technology

A technology of vibration signal and frequency characteristics, applied in the field of mechanical engineering, can solve problems such as signal discontinuity, time-frequency analysis distortion, modal aliasing, etc., to avoid modal aliasing, improve signal-to-noise ratio and maintain integrity Effect

Inactive Publication Date: 2019-03-12
FUZHOU UNIV +1
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Problems solved by technology

[0004] The inventor used the EMD decomposition method to decompose the vibration signal to obtain the corresponding IMF components in the paper "Feature Extraction of Diesel Engine Vibration and Acoustic Signal and Research on the Improvement of Low Vibration and Acoustic Body Structure". However, in the EMD decomposition, the signal is discontinuous. The obtained IMF components contain components of different time scales, which makes the related IMF components meaningless and can distort the time-frequency analysis. When the cubic spline interpolation function is used to fit the upper and lower envelopes, errors will be generated, and eventually the model The phenomenon of mode aliasing is serious; due to the discontinuity of the signal of the initial EMD decomposition, the inventor still cannot effectively overcome the mode aliasing phenomenon by using the CMF combined mode function method

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  • A vibration signal frequency feature extraction method based on eemd, cmf, wpt technology
  • A vibration signal frequency feature extraction method based on eemd, cmf, wpt technology
  • A vibration signal frequency feature extraction method based on eemd, cmf, wpt technology

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0028] A method for extracting frequency features of vibration signals based on EEMD, CMF, and WPT technologies in the embodiment of the present invention is as follows: figure 1 shown, including the following steps:

[0029] Step S110, using an acceleration sensor to measure the body of the diesel engine to obtain a vibration acceleration signal;

[0030] Step S120,

[0031] (1) Initialize the overall average number of times M and add the amplitude of the limited numerical value to the added white noise, and make i=1;

[0032] (2) Take a white noise n of a given amplitude i (t) is added to the original signal x(t) to form a new signal x i (t),x i (t)=x(t)+n i (t), x(t) which represents the ith additional noise signal, n i (t) represents the i-th added white noise seri...

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Abstract

The invention discloses a vibration signal frequency characteristic extraction method based on an EEMD technology, a CMF technology and a WPT technology. The method comprises the following steps: A. adopting an EEMD method to decompose a signal to obtain IMF components; B. selecting the IMF components according to a set critical value to prevent the IMF components from being removed; C. combining the relevant IMF components together by a CMF method to maintain the integrity of the signal; D. carrying out wavelet transform and wavelet packet decomposition to obtain the needed frequency information about the IMF components. The signal has continuity at various scales by means of adding Gaussian white noise having amplitude limitation, so that a modal aliasing phenomenon is effectively overcome, and signal extraction accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering, in particular to a vibration signal frequency feature extraction method based on EEMD, CMF and WPT technologies. Background technique [0002] "Energy and environment" are the two major research topics facing the development of automobile and internal combustion engine industry in the 21st century. In urban noise pollution, 75% comes from traffic noise with internal combustion engine as the main noise source. Internal combustion engine is the main vibration and noise source of vehicles, and the control of its vibration and noise has become one of the important research topics that are generally concerned by countries all over the world. In the research field of diesel engine vibration and noise control, feature extraction of vibration signals is a prerequisite, and the time-varying characteristics of vibration frequency components are important manifestations of signal features. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/14
CPCG16Z99/00
Inventor 杜宪峰李兴峰曹晓峰张立新刘福莉
Owner FUZHOU UNIV
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