A Study on the Synchronous Testing Technology of Cable Group Forces Based on Wavelet Transform

DOI

10.2991/978-94-6463-404-4_32How to use a DOI?

Keywords

Bridge engineering; Cable group; Synchronous cable force testing; Vibration frequency; Microwave radar; Wavelet transform

Abstract

This paper studies the synchronous testing technology of cable group forces based on wavelet transform using microwave radar measured data. A wavelet transforms method-based cable force identification method was established, which includes: (1) applying continuous complex Morlet wavelet transform to the vibration signal of the cable; (2) extracting the maximum value of the wavelet coefficient modulus from the wavelet ridge to identify the instantaneous frequency of the cable; and (3) improving wavelet threshold function for noise reduction. A cable force identification was conducted, where accelerometer and microwave radar were used to simultaneously collect the vibration response signals of the test cable when the cable force underwent linear changes. The signals were denoised and analyzed in the time-frequency domain, which enabled us to compute the cable forces by analyzing the identified frequencies.

The results indicated that the improved wavelet threshold function has a good denoise effect. It can extract clear wavelet ridges even with a low signal-to-noise ratio, enabling the identification of the cable force variation patterns of the test cables. The identified cable force from the accelerometer signal and radar signals closely matches the measured cable force, with a maximum deviation of only 1.6%. Leveraging the microwave radar’s multi-target tracking capability, synchronous cable forces testing for a cable group on a cable-stayed bridge was achieved. The time history of cable forces of multiple cables was obtained during the test periods.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Download article (PDF)

TY  - CONF
AU  - Shiji Liu
AU  - Tianpeng Wang
AU  - Ping Zhang
PY  - 2024
DA  - 2024/04/29
TI  - A Study on the Synchronous Testing Technology of Cable Group Forces Based on Wavelet Transform
BT  - Proceedings of the 2024 3rd International Conference on Structural Seismic Resistance, Monitoring and Detection (SSRMD 2024)
PB  - Atlantis Press
SP  - 324
EP  - 334
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-404-4_32
DO  - 10.2991/978-94-6463-404-4_32
ID  - Liu2024
ER  -