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Extraction of Full-Field Structural Dynamics from Digital Video Measurements in Presence of Large Rigid Body Motion

Dasari, Sudeep and Dorn, Charles and Yang, Yongchao and Farrar, Charles and Larson, Amy and Mascareñas, David (2017) Extraction of Full-Field Structural Dynamics from Digital Video Measurements in Presence of Large Rigid Body Motion. In: Shock & Vibration, Aircraft/Aerospace, Energy Harvesting, Acoustics & Optics. Conference Proceedings of the Society for Experimental Mechanics Series . Vol.9. Springer , Cham, Switzerland, pp. 91-95. ISBN 978-3-319-54734-3. http://resolver.caltech.edu/CaltechAUTHORS:20170711-131834042

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Abstract

Video cameras offer a versatile high resolution alternative to traditional sensor apparatuses for full field structural dynamics analysis. Previous work has extended phase based motion magnification techniques to achieve state of the art results in vibrational and structural analysis. One limitation on the current approach is that it does not work very well in situations where substantial rigid body motion is present in the scene. The large rigid motion drowns out the tiny vibrations that are relevant for a full-field structural analysis. This work extends upon previous phase based motion algorithms in order to allow them to work even in cases with large rigid body motion present. Through a keypoint tracking and video cropping scheme rigid body motion is subtracted from video streams, while preserving the smaller motions of interest. After this preprocessing step, the new video stream can be passed into the full-field analysis scheme as usual, in order to get a full-field modal decomposition.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1007/978-3-319-54735-0_10DOIArticle
https://link.springer.com/chapter/10.1007%2F978-3-319-54735-0_10PublisherArticle
Additional Information:© 2017 The Society for Experimental Mechanics, Inc. First Online: 18 April 2017.
Group:GALCIT
Subject Keywords:Operational modal analysis; Video processing; Blind source separation; Motion magnification; Rigid motion
Record Number:CaltechAUTHORS:20170711-131834042
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170711-131834042
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78952
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Jul 2017 20:57
Last Modified:11 Jul 2017 20:57

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