Structural mode identification method based on computer vision and variational mode decomposition

A technology of variational mode decomposition and computer vision, which is applied to computer components, character and pattern recognition, calculation, etc., can solve the problems of frequent modal aliasing, etc., and achieve limited measurement points, ensure accuracy and low cost Detection effect
CN113128474AActive Publication Date: 2021-07-16CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV
Publication Date
2021-07-16

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Abstract

The invention discloses a structural mode identification method based on computer vision and variational mode decomposition, and the method comprises the steps of collecting a vibration video of a structural object, and selecting pixel points meeting a preset pixel level in the vibration video as feature points; calculating the speed of each selected feature point by using a Farneback dense optical flow algorithm; calculating the speed and acceleration of each feature point in a real ground coordinate system by using a scale transformation mode to obtain an acceleration signal of a non-stationary sequence; performing noise reduction processing on the acceleration signal by using a variational mode decomposition method; and recognizing the acceleration signal after noise reduction processing by using a frequency domain decomposition method to obtain the vibration characteristics of the structure in each order mode. According to the invention, the vibration video of the structure is calculated and multi-modal extracted by using the improved optical flow algorithm in a non-contact manner, so that the real-time, efficient and low-cost detection of the dynamic characteristics of the structure is realized.
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Description

technical field

[0001] The invention relates to the technical field of structural dynamic testing, and more specifically relates to a structural mode recognition method based on computer vision and variational mode decomposition. Background technique

[0002] At present, the commonly used structural dynamic detection methods at home and abroad include free vibration method, resonance method and pulsation method. The free vibration method is a test method that causes the structure to vibrate freely under impact loads to measure the dynamic characteristics. In order to make the structure vibrate freely, methods such as sudden loading and sudden unloading are usually used. The resonance law is to apply a simple harmonic dynamic load to the structure by using a special vibrator, so that the structure produces a constant forced simple harmonic vibration, and uses the resonance phenomenon to identify the modal parameters of the structure. Both the free vibration method and the re...

Claims

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