期刊
REMOTE SENSING
卷 13, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/rs13173471
关键词
experimental modal analysis; modal damping; modal mass; computer vision; vibration testing
类别
资金
- Bolashak International Scholarship of the President of the Republic of Kazakhstan for doctoral studies at the University of Leicester, UK
- Polish National Agency for Academic Exchange (NAWA) under the Polish Returns programme [PPN/PPO/2019/1/00036]
- UK Collaboratorium for Research in Infrastructure & Cities (UKCRIC)
- Engineering and Physical Sciences Research Council (EPSRC) [EP/P017169/1]
- EPSRC [EP/P017169/1] Funding Source: UKRI
This study demonstrates the potential of camera-based vibration monitoring systems in experimental modal analysis, showing high accuracy in modal parameters analysis under varying levels of intensity. However, effective application of these systems requires consideration of issues related to sensitivity, nature of excitation force, and signal and image processing.
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.
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