Computer vision-based structural displacement measurement using an Unmanned Aerial System(UAS)
Structural Health Monitoring(SHM)applications mostly begins with measuring the dynamic response of structures.However,measuring displacement is not a trivial task due to difficulty in requiring a fixed reference point,high cost,and/or low accuracy.Recent researchers have conducted studies on vision-based SHM using cameras,which provides noncontact and efficient measurement.However,most of these approaches have been limited to stationary cameras,which have the challenge of finding a location to deploy the cameras with appropriate line-of-sight,especially to monitor critical civil infrastructures such as bridges.The Unmanned Aerial System(UAS)can potentially overcome the limitation of finding optimal locations to deploy the camera,but existing vision-based displacement measurement methods rely on the assumption that the camera is stationary.The displacements obtained by such methods will be a relative displacement of a structure to the camera motion,not an absolute displacement.Therefore,this paper presents a framework to achieve absolute displacement of a structure from a video taken from an UAS using the following phased approach.First,a target-free method is implemented to extract the relative structural displacement from the video.Next,the six degree-of-freedom camera motion(three translations and three rotations)is estimated by tracking the background feature points.Finally,the absolute structural displacement is recovered by combining the relative structural displacement and the camera motion.The performance of the proposed system has been validated in the laboratory using a commercial UAS.
Computer-Vision Displacement Measurement Unmanned Aerial System (UAS) Structural Health Monitoring (SHM) Railroad Bridge Monitoring
Hyungchul Yoon Jaeho Shin Bille F.Spencer
School of Civil Engineering,Chungbuk National University,Cheongju,South Korea Department of Civil and Environmental Engineering,University of Illinois at Urbana-Champaign,Urbana
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
1641-1647
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）