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Why mode shapes are not mass normalized when it is subjected to ambient excitation?

If the modal properties are obtained from ambient excitation, then the mode shapes will not be mass-normalized. what may be the reason ? 

praka2010's picture

How to obtain mode shapes from FRF modal analysis?

I am finding difficulties to obatain the mode shape from Frequency Response Function (FRF). Let know me the brief procedure in the modal analysis. 

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