The quadratic quantities of interest in vibration analysis are kinetic and potential energy and power flow density (intensity). All of these quantities can be measured. The classical procedures for the measurement of energy in vibrating linear structures are based on static representation of the Hooke's law. As a rule, structural damping is not taken into account in a correct manner which can lead to large underestimation or overestimation of true energy levels. The influence of structural damping is demonstrated for some characteristic cases of plates and beams.
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