In this research paper a rotor which serves as a rotating structure is driven by a 4KW alternating current motor through couplings which is suspended byan active magnetic bearingwith its position Sensors and Hall Effect Sensors connected in place which are finally connected to a main computer. A digital link which interface between the DSP and the general mathematics program is made to run on computer in which all the forces and the displacement signals are available in analog whichthen processed and finally display the results. Natural frequencies and mode shapes were used for predicting dynamic behaviors of rotor model, in determing this the free-free system were assumed without putting the bearings in operation and then subsequently the rotational speed was set, the first three natural frequencies of the system without rigid modes with its corresponding values was used as the process and stages observability and controllability of the rotor system during the experiment and the analysis process. Modal analysis was then performed for the free-free boundary conditions for the rotor system with bearing conditions when the rotor speed was equal to 20000rpm. The structure under investigation was established with a measured model input-output impulse response functions and the results studied and discussed.
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