Journal ArticleDOI
Blind, simultaneous identification of full-field vibration modes and large rigid-body motion of output-only structures from digital video measurements
TLDR
This study presents the development of adapting a recently-proposed video-based method for output-only, simultaneous identification of both the subtle, full-field deformation modes and the dominant rigid-body motion from only the video of the vibrating while moving structure.About:
This article is published in Engineering Structures.The article was published on 2020-03-15. It has received 28 citations till now. The article focuses on the topics: Optical flow & Operational Modal Analysis.read more
Citations
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Journal ArticleDOI
Non-contact vibration sensor using deep learning and image processing
Jin-quan Guo,Xinran Wu,Jiantao Liu,Tieping Wei,Xiaoxiang Yang,Xiaoxiang Yang,Xinyi Yang,Bingwei He,Weihao Zhang +8 more
TL;DR: The results demonstrate that the proposed non-contact vibration measurement method is robust, even under real-world unfavorable conditions, meaning it can serve as a novel measurement method in the field of vibration measurement.
Journal ArticleDOI
Noncontact operational modal analysis of light poles by vision-based motion-magnification method
TL;DR: A vision-based vibration measurement of the light poles on elevated highway bridges using motion magnification and dynamic mode decomposition methods is proposed and demonstrates the capability of the proposed method in extracting multi-mode vibration characteristics of theLight poles accurately in a noncontact long-distance measurement.
Journal ArticleDOI
Extracting full-field subpixel structural displacements from videos via deep learning
TL;DR: Wang et al. as mentioned in this paper developed a deep learning framework based on convolutional neural networks (CNNs) that enable real-time extraction of full-field subpixel structural displacements from videos.
Journal ArticleDOI
Non-contact optical dynamic measurements at different ranges: a review
TL;DR: In this paper, three types of techniques for different measurement ranges: interferometric techniques for deformation or vibration (nanometer to sub-millimeter amplitude) whose measurement accuracies rely on phase extraction of inter-ferometric signal, imaging based techniques with the aid of moire, structured light, and man-made speckles, whose sensitivities is from 1/100 to 1/10 pixel; and videometrics for large deformation detection (greater than centimeter amplitude).
Journal ArticleDOI
Accuracy of phase-based optical flow for vibration extraction
Sean Collier,Tyler Dare +1 more
TL;DR: In this article , phase-based optical flow done using the complex steerable pyramid is evaluated to quantify upper and lower bounds of accurate pixel displacement extraction, and the expected bounds given ideal image parameters as well as a metric to adjust these bounds for a general scenario.
References
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Journal ArticleDOI
Determining optical flow
TL;DR: In this paper, a method for finding the optical flow pattern is presented which assumes that the apparent velocity of the brightness pattern varies smoothly almost everywhere in the image, and an iterative implementation is shown which successfully computes the Optical Flow for a number of synthetic image sequences.
Proceedings ArticleDOI
Determining Optical Flow
TL;DR: In this article, a method for finding the optical flow pattern is presented which assumes that the apparent velocity of the brightness pattern varies smoothly almost everywhere in the image, and an iterative implementation is shown which successfully computes the Optical Flow for a number of synthetic image sequences.
Journal ArticleDOI
A summary review of vibration-based damage identification methods
TL;DR: In this paper, the authors provide an overview of methods to detect, locate, and characterize damage in structural and mechanical systems by examining changes in measured vibration response, including frequency, mode shape, and modal damping.
Book
Image Correlation for Shape, Motion and Deformation Measurements: Basic Concepts,Theory and Applications
TL;DR: In this paper, a comprehensive overview of image correlation for shape, motion and deformation measurements is provided. But, the authors do not discuss the effect of out-of-plane motion on 2D measurements.
Book
Finite Element Model Updating in Structural Dynamics
TL;DR: A comparison of Numerical Data with Test Results and Iterative Methods Using Modal Data for Model Updating shows that the former is more accurate than the latter.