Nonlinear Reduced Order Observer Based Controller Design for High-Speed Trains

This paper considers the control design problem of lateral and roll motion of the high speed train (HST) system causing the risk of operational safety. The HST is a higher order multiple-input-multiple-output (MIMO) system consists of nonlinear coupled dynamics. A delay-independent reduced order observer is designed for the estimation of unmeasurable states of the HST. Based on the reduced order observer, a nonlinear feedback controller is proposed to attenuate the unknown disturbances. The closed loop stability analysis of the proposed observer based controller is analyzed using Lyapunov theory. The performance analysis of the proposed control scheme has been done with the help of simulation studies.