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Performance of Camera-Based Vibration Monitoring Systems in Input-Output Modal Identification Using Shaker Excitation

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journal contribution
posted on 2021-09-29, 13:13 authored by Maksat Kalybek, Mateusz Bocian, Wojciech Pakos, Jacek Grosel, Nikolaos Nikitas
Despite significant advances in the development of high-resolution digital cameras in the last couple of decades, their potential remains largely unexplored in the context of input-output modal identification. However, these remote sensors could greatly improve the efficacy of experimental dynamic characterisation of civil engineering structures. To this end, this study provides early evidence of the applicability of camera-based vibration monitoring systems in classical experimental modal analysis using an electromechanical shaker. A pseudo-random and sine chirp excitation is applied to a scaled model of a cable-stayed bridge at varying levels of intensity. The performance of vibration monitoring systems, consisting of a consumer-grade digital camera and two image processing algorithms, is analysed relative to that of a system based on accelerometry. A full set of modal parameters is considered in this process, including modal frequency, damping, mass and mode shapes. It is shown that the camera-based vibration monitoring systems can provide high accuracy results, although their effective application requires consideration of a number of issues related to the sensitivity, nature of the excitation force, and signal and image processing. Based on these findings, suggestions for best practice are provided to aid in the implementation of camera-based vibration monitoring systems in experimental modal analysis.

History

Citation

Remote Sens. 2021, 13(17), 3471; https://doi.org/10.3390/rs13173471

Author affiliation

School of Engineering

Version

  • VoR (Version of Record)

Published in

Remote Sensing

Volume

13

Issue

17

Publisher

MDPI

eissn

2072-4292

Acceptance date

2021-08-29

Copyright date

2021

Available date

2021-09-29

Language

English