Frequency detection method of non-stationary signal and storage medium

A non-stationary signal and frequency detection technology, applied in the testing of mechanical components, the testing of machine/structural components, and measuring devices, etc., can solve the problems of low frequency detection accuracy of non-stationary signals, and improve the frequency detection accuracy and improve Accuracy, the effect of reducing the frequency detection error

Active Publication Date: 2020-11-10
HUNAN WULING POWER TECH CO LTD +1
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Problems solved by technology

[0005] In view of this, the present invention provides a non-stationary signal frequency detection method and a storage medium to solve the problem of low accuracy of the existing non-stationary signal frequency detection

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  • Frequency detection method of non-stationary signal and storage medium
  • Frequency detection method of non-stationary signal and storage medium
  • Frequency detection method of non-stationary signal and storage medium

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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments produced by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. In addition, it should be noted that "the..." in the content of the specific embodiment only refers to the technical attributes or characteristics of the present invention.

[0044] figure 1 It is a schematic flow chart of a non-stationary signal frequency detection method provided according to an embodiment of the present invention, figure 2 It is a windowed short-time Fourier transform representation diagram corresponding to a window function w...

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Abstract

The invention provides a non-stationary signal frequency detection method and a storage medium, and the detection method comprises the steps: selecting a window function of short-time Fourier transform according to the kurtosis of a non-stationary signal, and introducing a mode of multi-synchronous compression transform and data fusion to improve the energy concentration and frequency resolution of a time-frequency transform result. Accurate frequency detection of non-stationary signals can be achieved through a ridge line extraction algorithm.

Description

technical field [0001] The invention belongs to the technical field of signal frequency detection, and in particular relates to a non-stationary signal frequency detection method and a storage medium. Background technique [0002] Spectrums of non-stationary signals (e.g. vibration signals of large shafts) in equipment such as hydroelectric generators may change as the equipment fails (loose or disconnected connections of mechanical parts, abnormal friction between parts, component installation Therefore, we usually need to detect the frequency of the non-stationary signal of these devices, so as to judge the fault state of the device according to the spectrum change of the frequency. [0003] The time-frequency analysis method is widely used in the field of frequency detection technology of non-stationary signals. By analyzing the non-stationary signal through the time-frequency analysis method to obtain its time-frequency representation results, the frequency components of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01M13/00
CPCG01H17/00G01M13/00
Inventor 胡边万元谭丕成朱红平曾辉斌刘宇
Owner HUNAN WULING POWER TECH CO LTD
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