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Article

Performance of Optical Structural Vibration Monitoring Systems in Experimental Modal Analysis

1
School of Engineering, University of Leicester, Leicester LE1 7RH, UK
2
Dynamics, Vibration & Acoustics Laboratory, University of Leicester, Leicester LE1 7RH, UK
3
School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Paulo Antunes
Sensors 2021, 21(4), 1239; https://doi.org/10.3390/s21041239
Received: 4 January 2021 / Revised: 4 February 2021 / Accepted: 8 February 2021 / Published: 10 February 2021
(This article belongs to the Section Optical Sensors)
Image-based optical vibration measurement is an attractive alternative to the conventional measurement of structural dynamics predominantly relying on accelerometry. Although various optical vibration monitoring systems are now readily available, their performance is currently not well defined, especially in the context of experimental modal analysis. To this end, this study provides some of the first evidence of the capability of optical vibration monitoring systems in modal identification using input–output measurements. A comparative study is conducted on a scaled model of a 3D building frame set in a laboratory environment. The dynamic response of the model to an impulse excitation from an instrumented hammer, and an initial displacement, is measured by means of five optical motion capture systems. These include commercial and open-source systems based on laser Doppler velocimetry, fiducial markers and marker-less pattern recognition. The performance of these systems is analysed against the data obtained with a set of high-precision accelerometers. It is shown that the modal parameters identified from each system are not always equivalent, and that each system has limitations inherent to its design. Informed by these findings, a guidance for the deployment of the considered optical motion capture systems is given, aiding in their choice and implementation for structural vibration monitoring. View Full-Text
Keywords: optical systems; structural health monitoring; modal testing; vibration measurement; experimental modal analysis optical systems; structural health monitoring; modal testing; vibration measurement; experimental modal analysis
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MDPI and ACS Style

Kalybek, M.; Bocian, M.; Nikitas, N. Performance of Optical Structural Vibration Monitoring Systems in Experimental Modal Analysis. Sensors 2021, 21, 1239. https://doi.org/10.3390/s21041239

AMA Style

Kalybek M, Bocian M, Nikitas N. Performance of Optical Structural Vibration Monitoring Systems in Experimental Modal Analysis. Sensors. 2021; 21(4):1239. https://doi.org/10.3390/s21041239

Chicago/Turabian Style

Kalybek, Maksat, Mateusz Bocian, and Nikolaos Nikitas. 2021. "Performance of Optical Structural Vibration Monitoring Systems in Experimental Modal Analysis" Sensors 21, no. 4: 1239. https://doi.org/10.3390/s21041239

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