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H. Ecker, M. Tauchner:
"Experimental results obtained from a rotor with intermittent stator contact";
in: "Dynamics of Machines 2003 - Proceedings", I. Dobias (ed.); Czech Committee of the EUROMECH Society, Praha, 2003, ISBN: 80-85918-81-1, 35 - 42.

In this contribution a test rig for the investigation of rotor-stator contact is presented and some experimental results are discussed. A highly flexible Jeffcott-rotor is mounted vertically on two bearings and driven by an electric motor. At the midspan position between the bearings a disk is attached that may get in contact with a heavy stator surrounding the disk. In several experiments at constant rotor speeds various single- and multi-periodic orbits with and without contacts were obtained. It was possible to show that within a certain range of the rotor speed two different orbits were stable and could be observed. One of these orbits was an orbit without rotor-stator contact whereas in the other case the rotor experienced several contacts within one period of the orbit. Experimentally these different orbits could be realised by slowly increasing or decreasing the rotor speed, respectively.

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