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Modal testing of rotordynamic test rig for rotor- stator rub investigation

The object of this paper is preliminary modal testing of a new rotordynamic test rig for rotor- stator rub investigation. The main goals of this testing are determination of the base plate rigid body natural frequencies and choosing appropriate elastic elements in order to set this rigid body frequencies as low as possible. Therefore, two sets of rubber elastic elements are analyzed. Further, natural frequencies of the rotor, stator and coupled rotor-stator (without rotation) are investigated too. Those natural frequencies are analyzed especially in horizontal and vertical direction with respect to possible lateral movement of the rotor.

Modal testing; rotordynamic test rig; natural frequencies

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