Control Method of the Semi-Active Damper Coil System in the Superconducting Magnetically Levitated Bogie Against Vertical and Pitching Oscillation

Numerical simulation of the superconducting magnetically levitated bogie (JR Maglev) has been studied. The electrodynamic suspension is used for levitation and guidance. Although this suspension needs no gap control, damping factor of the system is shown to be small. Therefore the additional damping system is considered. The damper coil system is introduced to increase damping of the levitation system. Switching function of the damper coils are introduced. This semi-active damper coil system shows large effect to decrease vertical oscillation of the bogie. In this levitation system, interaction between vertical oscillation and pitching motion is large. The running simulation program which calculates rotational motion of the bogie is developed. As the control method of the semi-active damper coils system is defined corresponding to the vertical oscillation of the bogie, it does not work to decrease pitching oscillation in some case. Thus the control method that shows effects both vertical oscillation and pitching motion are considered. Using this method, the running simulation of the bogie when vertical oscillation and pitching motion occur has been undertaken. The pitching motion of the bogie converges by this control method.