Abstract
The paper investigates experimentally and numerically the nonlinear dynamics of a rotor supported by Active Magnetic Bearings (AMBs) and subjected to more or less severe motions from its support. In case of strong base excitations, the rotor can contact its touchdown bearings (TDBs) which are emergency bearings. The objective is to analyze the effect of the combination of mass unbalance forces, base motion excitations and contact nonlinearities on a rotor-AMB system response. The Finite Element method was used to model the on-board rotor. External force vectors and matrices with parametric coefficients related to the base motions appear in the equations of motion. The contact was modelled with a bilinear normal contact law and the tangential sliding friction effects are considered. Experiments were carried out on a lab-scale test rig that was mounted on a 6-axis shaker. At this stage, only harmonic base motions were considered. The numerical model was able to describe accurately the observed phenomena. AMBs were able to maintain the system under control, and the system remains stable even during the contact phase.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
