Rotor dynamic investigations to predict the behaviour of large rotors and fast running rotors, providing exact descriptions of the properties of the bearings are inevitable in order to ensure low shaft vibration amplitudes and to secure the safe operation of blading under the condition of very narrow clearances, oil film instability and fluid flow clearance instability. Proper running of rotors has to be ensured with squeeze film damped roller bearings which are applied in jet engines and modern power plants. Computer programs for the simulation of these rotor dynamic and disc vibration effects have been developed and successfully applied and we have also provided proper software for easy application. Another part of this work area is concerned with the torsional vibrations being transmitted through the shafts of steam and gas turbine plants at synchronising and during short circuit with large exciting electrical moments. Fast running turbines with gears in the shaft train pose a difficult problem because of non-linearity due to the clearances in gears and couplings. By automatic synchronising the action of governing systems causes quick actions and the shafts to respond which have to be investigated and simulated in the course of torsional vibrations. The institute works in cooperation with the machine building industry and owners of power stations regarding the resistance to short circuits, which requires intensive calculation.
|Effective start/end date||1/01/95 → …|
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