A nonlinear disturbance observer for multivariable systems and its application to magnetic bearing systems

@article{Chen2004AND,
  title={A nonlinear disturbance observer for multivariable systems and its application to magnetic bearing systems},
  author={Xinkai Chen and Chun-Yi Su and Toshio Fukuda},
  journal={IEEE Transactions on Control Systems Technology},
  year={2004},
  volume={12},
  pages={569-577}
}
This paper proposes a new nonlinear-disturbance observer for multivariable minimum-phase systems with arbitrary relative degrees. The model uncertainties and the system nonlinearities are treated as disturbances. The estimation of individual disturbances is independent of each other and the derivatives of the disturbances can be independently estimated. The proposed formulation is inspired by the variable structure-control method and adaptive algorithms where the a priori information concerning… CONTINUE READING

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