Publisher : The Korean Society for Aeronautical & Space Sciences
DOI : 10.5139/IJASS.2015.16.3.380
Title & Authors
Performance evaluation method of homogeneous stereo camera system for full-field structural deformation estimation Yun, Jong-Min; Kim, Ho-Young; Han, Jae-Hung; Kim, Hong-Il; Kwon, Hyuk-Jun;
This study presents how we can evaluate stereo camera systems for the structural deformation monitoring. A stereo camera system, consisting of a set of stereo cameras and reflective markers attached on the structure, is introduced for the measurement and the stereo pattern recognition (SPR) method is utilized for the full-field structural deformation estimation. Performance of this measurement system depends on many parameters including types and specifications of the cameras, locations and orientations of them, and sizes and positions of markers; it is difficult to experimentally identify the effects of each parameter on the measurement performance. In this study, a simulation framework for evaluating performance of the stereo camera systems with various parameters has been developed. The maximum normalized root-mean-square (RMS) error is defined as a representative index of stereo camera system performance. A plate structure is chosen for an introductory example. Its several modal harmonic vibrations are generated and estimated in the simulation framework. Two cases of simulations are conducted to see the effects of camera locations and the resolutions of the cameras. An experimental validation is carried out for a few selected cases from the simulations. Using the simultaneous laser displacement sensor (LDS) measurements as the reference, the measurement errors are obtained and compared with the simulations.
stereo pattern recognition (SPR);stereo camera system;simulation framework;structural deformation estimation;
Kim, H.-I., Kang, L.-H. and Han, J.-H., "Shape estimation with distributed fiber Bragg grating sensors for rotating structures", Smart Materials and Structures, Vol. 20, No. 3, 2011, 035011.
Djuric-Jovicic, M. D., Jovicic, N., and Popovic, D. B., "Kinematics of Gait: New Method for Angle Estimation Based on Accelerometers", Sensors, Vol. 11, No. 11, 2011, pp. 10571-10585.
Kim, H.-I., Kim, H.-Y., Park, H.-J. and Han, J.-H., "Development of a Point Tracking System for Measuring Structural Deformations Using Commercial Video Cameras", International Journal of Aeronautical and Space Sciences, Vol. 10, No. 2, 2009, pp.86-94.
Wu, L.-J., Casciati, F. and Casciati, S., "Dynamic testing of a laboratory model via vision-based sensing", Engineering structures, Vol. 60, 2014, pp. 113-125.
Kurita, M., Koike, S., Nakakita, K. and Masui, K., "In-Flight Wing Deformation Measurement", 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 07-10 January 2013, Grapevine (Dallas/Ft. Worth Region), TX, AIAA 2013-0967
Yu, Y., Yang, Q. and Wang, X., "3D imaging application in the studies of micro air vehicles", Computers in industry, Vol. 64, No. 9, 2013, pp. 1178-1185.
Pang, Z. Y., Cesnik, C. E. and Atkis, E. M., "In-Flight Wing Deformation Measurement System for Small Unmanned Aerial Vehicles", 55th AIAA/ASME/ASCE/AHS/SC Structures, Structural Dynamics, and Materials Conference, 13-17 January 2014, National Harbor, MD, AIAA 2014-0330.
van der Wall, B. G., Burley, C. L., Yu, Y. H., Richard, Y. H., Richard, H., Pengel, K. and Beaumier, P., "The HART II test - measurement of helicopter rotor wakes", Aerospace Science and Technology, Vol. 8, No. 4, 2004, pp. 273-284.
Schneider, O., "Analysis of SPR measurements from HART II", Aerospace Science and Technology, Vol. 9, No. 5, 2005, pp. 409-420.
Kim., D.-H., Kim, S.-H., Park, J.-W., and Han, J.-H., "Blade Deformation Measurement of a Model-Scale Rotor System Using a SPR system with IR cameras", 39th European Rotorcraft Forum, 3-6 September 2013, Moscow.
Kim, S.-W. and Kim, N.-S., "Multi-point Displacement response measurement of civil infrastructures using digital image Processing", The Proceedings of the Twelfth East Asia-Pacific Conference on Structural Engineering and Construction, Vol., 14, 2011, pp. 195-203.
Lee, J. J. and Shinozuka, M., "A vision-based system for remote sensing of bridge displacement", NDT & E International, Vol. 39, No. 5, 2006, pp. 425-431.
Ni, Y. Q., Wong, K. Y. and Xia, Y., "Health Checks through Landmark Bridges to Sky-high Structures", Advances in Structural Engineering, Vol. 14, No. 1, 2011, pp. 103-119.
Lee, J.-H., Ho, H.-N., Shinozuka, M. and Lee, J.-J., "An advanced vision-based system for real-time displacement measurement of high-rise buildings", Smart Materials and Structures, Vol. 21, No. 12, 2012, 125019
Kim, H.-Y., Lee, J.-S. and Han, J.-H., "Autonomous formation flight of multiple flapping-wing flying vehicles using motion capture system", Aerospace Science and Technology, Vol. 39, No. 1, 2014, pp. 596-604.
Lee, D., Jeon, H. and Myung, H., "Vision-based 6-DOF displacement measurement of structures with a planar marker", Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring, International Society for Optics and Photonics, 11-16 March 2012, San Diego, Proceedings of the SPIE Paper No. 834528.
Jeon, H., Kim, Y., Lee, D. and Myung, H., "Vision-based remote 6-DOF structural displacement monitoring system using a unique marker", Smart Structures and Systems, Vol. 13, No. 6, 2014, pp. 927-942.
Hartley, R. I. and Strum, P., "Triangulation", Computer Vision and Image Understanding, Vol. 68, No. 2, 1997, pp.146-157.
Michael, R. H., Vibration simulation using MATLAB and ANSYS, Chapman & Hall, New York, 2001.