More on Modal Analysis

[@Torq123]

Thanks again . For the closely spaced modes , the modal orthogonality won’t be mathematically applicable right ??? as these closed spaced modes have the influence to each other as they exchange energy. Is there any detailed discussion or reference journal on the energy exchange in between these closely spaced modes …

[@Performance-BasedSeismic-ns6yo]

Thank you for your deep inquiry. Closely spaced modes are said to be tightly correlated. The correlation index is given by a Mac number. Tightly correlated modes are "fugitively" alike to each other and may not follow general rules. You may read - Nayfeh, A. H. and Mook, D. T., ‘Energy transfer from high-frequency to low-frequency modes in structures’, Journal of Vibration and Acoustics 117, 1995, 186-195. Nayfeh has done a large volume of work in this direction.. .. However, I have not delved deep into the issue.

[@Torq123]

@@Performance-BasedSeismic-ns6yo thanks a lot for such a great info .

[@AAKASHN-q1i]

Thanks a lot sir

[@AAKASHN-q1i]

Sir there is also called normal coordinate, can u make a video on it also, like conversion of modal coordinate to Normal coordination i.e uncoupling n equivalent equations
And Superposition of modes

[@SheddingLeaves]

I'll try