10 Full-Field Mode Shape Identification of Vibrating Structures from Compressively Sampled Video 97 Fig. 10.2 The modal coordinates extracted from the video of the vibrating cantilever beam with no compressive downsampling. Mode 1 occurs at 7.2 Hz, mode 2 is at 47.2 Hz and Mode 3 occurs at 133.6 Hz. The original video is captured at 480 FPS Fig. 10.3 Modes extracted from the randomly selected frames. The original video is captured at 480 FPS. The mode shapes have been rotated 90◦ from the vertical position in order to facilitate their display and visual comparison It appeared that the algorithm was not able to observe the third mode in this case, and instead tried to split the second mode into two separate independent shapes. This observation was based on the fact that the 2nd and 3rd mode shape extracted by
RkJQdWJsaXNoZXIy MTMzNzEzMQ==