mu synthesis of flexible rotor-magnetic bearing systems

The mu synthesis design method was evaluated for a flexible rotor magnetic bearing system with a five-axis-control system using both simulations and experiments, After modeling the full-order system using the finite element method, we obtained a reduced-order model in the modal domain by truncating the flexible modes, After choosing appropriate weighting functions with respect to frequency, we designed the mu-synthesis control system using the mu-toolbox in MATLAB, We then carried out simulations of the control system for a flexible rotor magnetic bearing system with a five-axis-control system and obtained good performance, Next, we conducted experiments to verify the robustness of the controllers on a test rig during initial levitation, The mu controllers provided robust stability and performance over a wide range of parameter variations in the test rig.