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Transient time-frequency feature extraction method based on dynamic response of single-degree-of-freedom system

A technology of time-frequency characteristics and system dynamics, applied in pattern recognition in signals, instrument, character and pattern recognition, etc., can solve the problems that frequency characteristics are no longer applicable, transient characteristic oscillation frequency components cannot be accurately represented, etc.

Active Publication Date: 2021-08-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

This scheme can theoretically improve the time resolution, but in turn is no longer suitable for the extraction of frequency features, that is, the oscillation frequency of transient features and other frequency components existing in the signal cannot be accurately characterized

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  • Transient time-frequency feature extraction method based on dynamic response of single-degree-of-freedom system
  • Transient time-frequency feature extraction method based on dynamic response of single-degree-of-freedom system
  • Transient time-frequency feature extraction method based on dynamic response of single-degree-of-freedom system

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] Such as figure 1 As shown, the embodiment of the present invention provides a transient time-frequency feature extraction method based on the dynamic response of a single-degree-of-freedom system, including:

[0047] S101, constructing a series of single-degree-of-freedom systems with different natural frequencies;

[0048] S102, applying the signal to be analyzed as a basic acceleration excitation to each constructed single-degree-of-freedom system to obtain a dynamic response signal of each single-degree-of-freedom system;

[0049] S103, calculating the envelope square signal of the dynamic response signal of each single-degree-of-freedom system;

[0050] S104. Assign each envelope square signal to a corresponding row vector...

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Abstract

The invention provides a transient time-frequency feature extraction method based on dynamic response of a single-degree-of-freedom system, and belongs to the technical field of signal time-varying feature extraction. The method comprises the following steps: constructing a series of single-degree-of-freedom systems with different inherent frequencies; applying a signal to be analyzed to each constructed single-degree-of-freedom system as basic acceleration excitation to obtain a dynamic response signal of each single-degree-of-freedom system; calculating an envelope square signal of the dynamic response signal of each single-degree-of-freedom system; and endowing each envelope square signal with a corresponding row vector of the time-frequency matrix according to the corresponding inherent frequency to obtain time-frequency distribution of the signal to be analyzed, and extracting transient time-frequency characteristics from the time-frequency matrix. By adopting the method and the device, the transient time-frequency characteristics in the to-be-analyzed signal can be accurately extracted.

Description

technical field [0001] The invention relates to the technical field of signal time-varying feature extraction, in particular to a transient time-frequency feature extraction method based on the dynamic response of a single-degree-of-freedom system. Background technique [0002] Mechanical equipment signals (such as acceleration, displacement, sound signals, electrical signals, etc.) are often accompanied by transient features. The sources of these features include sudden movements of mechanical structures, sudden changes in dynamic parameters caused by faults, etc. In the design and maintenance of mechanical equipment, it is often necessary to accurately extract the transient characteristics of the signal to reveal the dynamic characteristics, operating status, and health status of the mechanical equipment. Therefore, effective and accurate transient feature extraction technology is of great significance to the equipment manufacturing industry and the service safety of key e...

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Application Information

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IPC IPC(8): G06K9/00
CPCG06F2218/02G06F2218/08
Inventor 陈小旺冯志鹏
Owner UNIV OF SCI & TECH BEIJING
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