Dynamic properties such as stiffness and damping of mechanical joints are essential for the accurate prediction of the dynamic behaviors of the system and subsequent improvement of the design. So far several techniques, analytical, experimental, or both have been developed.
A technique using condensed F.E.M. model and Experimental Modal Analysis is presented to identify the joint structural parameters. First, modal parameters of structure are measured by Experimental Modal Analysis. Then finite element model of the structure is condensed for a certain complex frequency obtained from experiment to match with the order to the Experimental Modal Analysis model. Finally by equating the modal parameters obtained from experiment with those of the condensed system, the unknown joint structure parameters can be identified.
A simulation study is conducted to investigate the accuracy of technique. The experiments are performed with ball bearings in a rotor bearing system.
