Long-distance all-weather structural vibration monitoring system

A technology for structural vibration and monitoring systems, applied in closed-circuit television systems, electrical transmission signal systems, measuring devices, etc., can solve problems such as inability to achieve comprehensive real-time, high-precision anti-interference, low sampling frequency, and cumbersome installation of displacement sensors

Inactive Publication Date: 2021-07-06
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Contact displacement sensors such as dial indicators, linear displacement sensors, etc. These displacement sensors are cumbersome to install, time-consuming, labor-intensive, easy to wear, and need a fixed platform near the measurement point as a reference
Non-contact displacement measurement methods include global positioning system, synthetic aperture radar system, total station, etc., but the above systems are only suitable for the measurement of large displacements, and its accuracy is difficult to reach the millimeter level. The total station needs to install reflective light on the structure Original, and the sampling frequency is low, it is difficult to realize the dynamic real-time measurement of structural displacement
At present, it seems that the traditional monitoring method is not suitable for modern needs. In the past few years, the emerging machine vision measurement technology has attracted great attention from civil engineers because of its great advantages of non-contact, long-distance and high resolution. , but because of its inability to achieve comprehensive real-time, high precision, anti-interference and other problems, it has plagued the majority of researchers

Method used

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  • Long-distance all-weather structural vibration monitoring system
  • Long-distance all-weather structural vibration monitoring system
  • Long-distance all-weather structural vibration monitoring system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as Figure 1-3 As shown, a long-distance all-weather structural vibration monitoring system described in the present invention includes a structure under test 6, a video acquisition module 8 and a video processing module 9, the video acquisition module 8 is connected to the video processing module 9, and the structure under test 6 is equipped with a displacement monitoring marker; the video acquisition module 8 receives the vibration video of the displacement monitoring marker, and the video acquisition module 8 sends the received vibration video to the video processing module 9 for processing, and the video acquisition module 8 Including the network camera 1 and the network camera, the information processed by the video processing module 9 is sent to the output module.

[0040] The network camera 1 is connected to a first solar self-powered component 5 .

[0041] The displacement monitoring marker is an artificial light source 2 , and the artificial light source ...

Embodiment 2

[0059] Such as Figure 1-3 As shown, a long-distance all-weather structural vibration monitoring system described in the present invention has the same structure as that of Embodiment 1; the artificial light source 2 in the monitoring system is installed at the visible position of the network camera 1, which can increase the light intensity of the measured structure 6. Robustness under changes and the possibility of monitoring at night can also be changed according to the characteristics of ambient light to improve its recognition under different ambient light. The video is wirelessly transmitted into the video processing module 9 through the network camera 1 Computer 3, analysis software 4, through video analysis, collecting displacement changes for accurate measurement, and real-time early warning, and has a visual real-time window.

Embodiment 3

[0061] Such as Figure 2-7 As shown, a long-distance all-weather structural vibration monitoring system described in the present invention has the same structure as in Embodiment 1, and its implementation steps are as follows:

[0062] Determination of the object to be tested: measure the pedestrian bridge in Lanzhou University of Technology. The bridge is a scaled-down model of a medium-sized actual structure. The total mass of the bridge deck is 1580kg. The length of the bridge deck is 10m, the width is 1.6m, and the calculated span is 9.8m. During the measurement, the measurement point is obtained at a distance of 20m from the center of the bridge.

[0063] Contrast test: While performing network camera measurement, install a laser displacement meter directly below the middle of the bridge span to obtain corresponding time-domain waveform curves to verify the accuracy of visual measurement. The model of the laser displacement meter is Banner 250U, and the sampling frequency...

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Abstract

The invention discloses a long-distance all-weather structural vibration monitoring system. The system comprises a detected structure, a video acquisition module and a video processing module, the video acquisition module is connected with the video processing module, and a displacement monitoring marker is installed on the detected structure; the video acquisition module receives a vibration video of the artificial light source, the video acquisition module sends the received vibration video to the video processing module for processing, and information processed by the video processing module is sent to the output module. According to the system, the network camera is adopted as shooting equipment, high efficiency and high precision are achieved based on digital images, and high robustness is achieved; real-time acquisition, real-time analysis and real-time early warning are comprehensively achieved; the whole system adopts a self-power-supply mode for power supply, and the working environment application range is wide.

Description

technical field [0001] The invention relates to the technical field of structural intelligent monitoring, in particular to a long-distance all-weather structural vibration monitoring system. Background technique [0002] In the past few decades, there have been extensive studies on the response of various engineering structures, the displacement measurement of vibration and deflection under dynamic load, and the quasi-static load corresponding to the temperature effect. The measurement of structural deflection displacement is mainly through the identification of structural characteristics ( displacement, modal frequency, etc.) to monitor the health of the structure. Traditional displacement measurement methods can be divided into contact type and non-contact type according to the installation method. Contact displacement sensors such as dial indicators, linear displacement sensors, etc. These displacement sensors are cumbersome to install, time-consuming, labor-intensive, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01B11/02H04N7/18G08B21/18G08B7/06
CPCG01B11/02G01H9/00G08B7/06G08B21/18H04N7/18
Inventor 朱前坤王军营崔德鹏胡剑琇陈建邦
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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