A cable force test method based on mobile phone image recognition

Abstract

The invention discloses a cable force test method based on mobile phone image recognition, which includes: simultaneously setting a vibrating target point and a relatively stationary target point on a cable stay; The target point is always located in the camera viewing frame of the mobile phone; image processing is performed on the vibration video, the center points of the four target points are precisely positioned and corresponding coordinate information is obtained; the vibration displacement of the stay cable is calculated and Correction to obtain the final displacement time-history matrix; power spectral density analysis to obtain the natural frequency of the stay cable; calculation based on the relationship between the natural frequency and the cable force to obtain the stay cable force. The invention directly completes the video collection through the mobile phone, and extracts the vibration displacement of the stay cable by processing and analyzing the image data, thereby calculating the cable force value, and applying the machine vision technology to on-site cable force monitoring, realizing fast and convenient Non-contact measurement, while ensuring measurement accuracy and accuracy.

Description

technical field [0001] The invention relates to the technical field of bridge engineering monitoring. More specifically, the present invention relates to a cable force testing method based on mobile phone image recognition. Background technique [0002] During the construction of a cable-stayed bridge, the stability of the cable force of the cable-stayed cables within a certain range plays a vital role in the overall structural stability of the bridge during and after construction. In order to meet the requirements of construction control during the construction process And to judge the stability of the internal force distribution of the bridge structure after the completion of the bridge, it is necessary to timely and accurately detect the cable force of the stay cables. At present, the frequency method is usually used to measure the cable force of bridge structures. The traditional frequency method usually uses the acceleration sensor fixed on the cable to measure the vib...

AI Technical Summary

Problems solved by technology

At present, the frequency method is usually used to measure the cable force of bridge structures. The traditional frequency method usually uses the acceleration sensor fixed on the cable to measure the vibration frequency of the cable, and the measurement efficiency is low; the staff need to work at high altitude during the measurement. , the safety risk is high; it needs to be measured by professionals, which is difficult to measure; the fundamental frequency is judged by the staff during the measurement, and there are shortcomings such as subjective measurement errors

Images