Use of diagonal matrices in vibration analysis?

theone
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why are diagonal matrices and eigen vectors useful in vibrations analysis?
 
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Because the eigenvalues and eigenvectors correspond to normal modes.
 
theone said:
why are diagonal matrices and eigen vectors useful in vibrations analysis?
Because resonance is an eigenstate.
 
DrClaude said:
Be careful about that example: https://www.physicsforums.com/threads/expunging-myths-from-the-classrooom.849853
Thank you! And 'classroom' was exactly where I got it from ...

EDIT: “My experience is that excitement and interest in physics and engineering is generated not only by what is understood but also by what is not.” - Bernard Feldman, a physics professor at the University of Missouri, wrote in 2006.
A wise man!
 
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