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Full-scene vibration intensity spectrum analysis method based on visual vibration measurement

A technology of vibration intensity and analysis method, applied in measurement devices, testing of mechanical components, testing of machine/structural components, etc., can solve problems such as inability to detect effectively

Pending Publication Date: 2020-06-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For sub-pixel level vibration, traditional visual motion algorithms such as optical flow method, digital image correlation method, etc. cannot effectively detect
For fault detection, most traditional vision methods are only applicable to static objects

Method used

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  • Full-scene vibration intensity spectrum analysis method based on visual vibration measurement
  • Full-scene vibration intensity spectrum analysis method based on visual vibration measurement
  • Full-scene vibration intensity spectrum analysis method based on visual vibration measurement

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Embodiment Construction

[0078] In order to clearly illustrate the technical characteristics of this patent, the following describes this patent in detail through specific implementation methods and in conjunction with the accompanying drawings.

[0079] The present invention proposes a full-scene vibration intensity map analysis method based on visual vibration measurement. The method is based on the visual measurement technology that uses local phase changes to extract motion information to obtain the linear relationship between motion information in the time domain and phase changes in the frequency domain. It shows that the phase change in the frequency domain retains the motion information in the time domain. Based on this, the method calculates the phase change of each pixel in the image to form a local phase change matrix of the whole scene, and then visualizes the local phase change of the whole scene The matrix is ​​converted into a full-scene vibration intensity chromatogram, so as to realize...

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Abstract

The invention discloses a full-scene vibration intensity spectrum analysis method based on visual vibration measurement, and belongs to the field of structural health detection of mechanical vibration. Aiming at the problems, the invention provides the full-scene vibration intensity atlas analysis method based on visual vibration measurement, which has sub-pixel-level vibration measurement precision and can reflect the global vibration intensity of machinery. Analysis is carried out according to the following steps: A, extracting motion information by utilizing local phase change; and B, carrying out image processing of the visual full-scene vibration intensity map. According to the invention, vibration amplitude intensity graphs under different frequencies can be obtained by selecting proper filter passband frequencies; the visualization method not only solves the problem that the installation position of the sensor is uncertain in traditional contact type detection, but also providesconditions for modal shape analysis and health monitoring of structural parts based on vision through the vibration amplitude intensity graphs under different frequencies.

Description

technical field [0001] The invention belongs to the field of structural health detection of mechanical vibration, and the method relates to a visual vibration measurement method for extracting object motion information based on phase change. Background technique [0002] Rotating machinery accounts for the largest proportion of all mechanical equipment, accounting for about 80%, and is the basic facility in national production and life. The abnormal vibration of machinery will have a great negative impact on the normal operation state and normal working life of the machinery. For rotating machinery, abnormal vibration is always a difficulty affecting its reliable operation and working life. It has been shown in literature that about 60% of rotating machinery failures are caused by abnormal vibrations. Such failures will not only bring economic losses but may also lead to major accidents. It can be seen that vibration monitoring and corresponding fault detection are crucial...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/34G01M13/00G01H9/00
CPCG01M13/00G01H9/00G06V10/267G06F2218/06G06F2218/08
Inventor 彭聪周乾陈力
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS