With ANEAS it is possible to simulate the behavior of a system with active magnetic bearings as well as a rotor drop-down. For the drop-down simulations, conventional ball bearings and plain bearings can be used. It is also possible to use conventional touch-down bearings or planetary touch-down bearings as used for the flywheel storage systems at the IMS. The software can be used to investigate both inner and outer rotor systems.
The simulation in ANEAS is based on a flexible stator and rotor model, which are coupled either via the magnetic bearing forces or the strongly nonlinear contact forces in case of a touch-down bearing contact. The coupling by the contact force considers the contact stiffness of the rotor and the roller element in the touch-down bearing. In addition to that, the stiffness of the ball bearings as well as the stiffness of specifically introduced spring-damper elements is considered. These elements can be either elastomer rings or tolerance rings. The system of nonlinear differential equations is solved in the time domain. In post-processing, the behavior of the rotor is shown in diagrams and characteristic values are calculated, with which the severity of different rotor drop-downs can be compared.
Within the project KoREV-SMS the software was validated on the touch-down bearing test rig for a touch-down bearing system with six touch-down bearing units. Currently, ANEAS is being validated with further tests within the project KoREV-SMS2 with additional touch-down bearing configurations.