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In order to answer that question you need to build up your knowledge in vibrational dynamics. This usually takes a whole semester in undergraduate physics at the latter stage of an engineering curriculum. So you need to progress -at least- through the following concepts: The free response of the undamped Harmonic Oscillator with 1 dof (mass spring no ...


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Natural frequencies inside structures are standing waves that are reflected and propagated throughout the structure. The frequency of such wave depends on the shape of that wave and the speed at which sound travels through the material the structure is made of. The shape of possible waves in a structure I think can be well illustrated with Chladni figures. ...


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The difference between EMA (experimental modal analysis) and OMA (operational modal analysis) is that one is done under experimental conditions, which allow for you to know the excitation force, while the other is done under operational conditions, where the excitation is eg. internal, or otherwise not known, not measurable. OMA will produce responses (...


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