A Comparative Study on 2D and 3D Tracking of Vibration via Motion Magnified High-Speed Videos
Low-cost conventional and high-speed video recording devices allow the exploration of image-based methods for dynamic vibrational measurements and structural health monitoring(SHM)applications.A common challenge in the use of such methodologies for civil infrastructure lies in the tracking of specific feature points on the structure as well as coping with imperceptible motion during operation and testing.Magnified Tracking(MT),a novel measurement methodology based on the fusion of two techniques,namely the phase based motion magnification(PBMM)and particle tracking velocimetry(PTV)was previously introduced by our group.This study further explores the performance of 2D-and 3D-MT,within the frequency range of commercial cameras(<60 fps)as well as higher frequencies up to 500 fps.For this purpose,a three storey shear frame was excited with a uniaxial shake table and an impact hammer,synchronously recorded with a high-speed camera at 500 Hz.The camera was used both with and without a stereoscopic splitter arrangement for 2D and 3D applications.Results from the camera-based measurements are compared with conventional displacement and acceleration sensors,both in time and frequency domain.
Vibration-based measurement SHM structural identification motion magnification particle tracking velocimetry
Y.E.Harmanci U.Gülan M.Holzner E.Chatzi
Institute of Structural Engineering,ETH Zurich,Zurich,Switzerland Institute for Environmental Engineering,ETH Zurich,Zurich,Switzerland
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
1576-1584
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）