Research Of Cable Force Measurement Based On Digital Image Processing Technology

With the improvement of modernization,the number of cable-stayed bridge construction has increased dramatically,crossing capacity has also been greatly improved.But with the increase of span,the safe construction and operation of the cable-stayed bridge is also put forward higher requirements.The accurate measurement of cable force is very important in safety construction and operation.In order to improve the accuracy of cable force measurement and automation,this paper uses the image processing functions of Matlab,and through the double span continuous cable-stayed bridge model laboratory self-made single tower and double cable planes,the method of digital image processing technology used in cable-stayed bridge cable force measurement,to verify the validity of the digital image processing technology in the cable force measurement.The main work in this paper are as follows:(1)This paper introduces the development status of the cable-stayed bridge,review the research status of digital image processing technology and cable force testing technology,and puts forward the advantages of the application of digital image processing technology to the new idea of cable tension measurement of cable-stayed bridge.(2)Introduces the basic content of digital image processing,the processing steps of the video image,briefly introduces the whole pixel digital image edge detection method of several classical edge operator,and introduces several methods for detection of sub pixel is proposed by Yuan's team,expounds its basic principle,and demonstrates a video capture and the pretreatment of the test case.(3)Introduces the cable-stayed bridge cable force test of existing methods,and discusses the basic principle of frequency method of cable force testing,analyzes the factors that influence the frequency method of cable force testing,the cable-stayed bridge model processing,vibration mode and frequency of cable theory was deduced.(4)The cable-stayed bridge model processing,the cable-stayed bridge cantilever erection test,using the technology of digital image processing mode,the cable on the constructionphase of the frequency and tension were identified and compared with the theoretical solution,verify the reliability of the digital image processing technology in the test of cable force,successfully the application of video processing technology to model bridge cable force test.