Vibration signal frequency characteristic extraction method based on EEMD technology, CMF technology and WPT technology
A technology of vibration signal and frequency characteristics, applied in the field of mechanical engineering, can solve the problems of time-frequency analysis distortion, signal discontinuity, modal aliasing, etc., to improve the signal-to-noise ratio, avoid modal aliasing, and maintain integrity Effect
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[0027] The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the text of the description.
[0028] A method for extracting frequency characteristics of vibration signals based on EEMD, CMF, and WPT technologies in an embodiment of the present invention is as follows: figure 1 As shown, including the following steps:
[0029] Step S110: Use an acceleration sensor to measure the diesel engine body to obtain a vibration acceleration signal;
[0030] Step S120,
[0031] (1) Initialize the overall average number M and add a limited value to the added white noise, and set i = 1;
[0032] (2) Take a white noise of a given amplitude n 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 i-th additional noise signal, n i (t) represents the i-th white noise series added;
[0033] (3) The signal x of Gaussian ...
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