Abstract
Complex stiffness representation is proposed to analyze the dynamic characteristics of jointed structures. Measured results for single-jointed specimens were compared with predictions to show the influence of connecting stiffness. The proposed dynamic stiffness representation showed accurate vibration transfer characteristics of the single-jointed structures. For multi-jointed structures, the developed prediction model was extended based on the results of single-jointed structures. For experimentations, multi-jointed specimens having different binding strength and various defected parts were produced. Vibration transfer characteristics were measured. In order to fully represent dynamic characteristics of multi-jointed specimens, the spectral element method was used for theoretical modeling. Complex stiffness allowed modeling of coupling effect by multiple joints. In aspect of wave propagation characteristics, the proposed model was verified by comparison with measured vibrations of the multi-jointed specimens. Locations of defects in specimens were theoretically predicted by the verified model. Binding strength of the multi-jointed structures was quantitatively evaluated using the complex stiffness.
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