Can anyone help in COMAC?

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Muhammad Usman Tariq

May be these might help:

http://sem-proceedings.com/12i/sem.org-IMAC-XII-12th-Int-12-24-4-Damage-Location-Using-Vibration-Mode-Shapes.pdf

http://civil.iisc.ernet.in/~manohar/manohar_serc.pdf

https://www.scribd.com/doc/238865172/Damage-Detection-Frm-Mode-Shape-1

Guillaume Vermot Des Roches

MAC, Comac and other similar indicators test the orthogonality of modal vectors using various norms (mainly euclidean) and scaling strategies.

Try to illustrate your COMAC values for two orthogonal vectors and two collinear vectors to understand how your indicator works.