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SYSTEM AND METHOD FOR AUTOMATED EXTRACTION OF HIGH RESOLUTION STRUCTURAL DYNAMICS FROM VIDEO

United States Patent Application

20180084195
A1
View the Complete Application at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
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.
Yang, Yongchao (Los Alamos, NM), Kenyon, Garrett (Los Alamos, NM), Farrar, Charles (Los Alamos, NM), Mascarenas, David (Los Alamos, NM)
15/ 708,986
September 19, 2017
STATEMENT REGARDING GOVERNMENT RIGHTS [0002] The United States government has rights in this invention pursuant to Contract No. DE-AC52-06NA25396 between the United States Department of Energy and Los Alamos National Security, LLC for the operation of Los Alamos National Laboratory.