Blind, simultaneous identification of full-field vibration modes and large rigid-body motion of output-only structures from digital video measurements
Not Available
Yang, Yongchao (ORCID:0000000317763306)↗
Engineering topics
Farrar, Charles
Publications and source records attributed to Farrar, Charles.
System and method for automated extraction of high resolution structural dynamics from video
A method for extracting vibrational modes of a structure includes: receiving a plurality of video frames, each of the video frames including a plurality of pixels; decomposing each of the video frames on a plurality of spatial scales in accordance with complex steerable pyramid filters to obtain a filter response for each of the spatial scales; computing a plurality of local phases of the pixels of each frame; removing a temporal mean from each frame to obtain a plurality of factored vibration motion functions; performing principal component analysis on the factored vibration motion functions to obtain principal components; blind source separating the principal components to compute a plurality of modal coordinates; computing frequency and damping ratios in accordance with the modal coordinates; and outputting the computed frequency and damping ratios.
42 ENGINEERING↗