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Nonlinear Dynamics

, Volume 81, Issue 1–2, pp 257–264 | Cite as

Nonlinear attitude control scheme with disturbance observer for flexible spacecrafts

  • Zhen Wang
  • Zhong Wu
Original Paper

Abstract

To attenuate the effects of parameter variations and disturbances of flexible spacecrafts on attitude control accuracy and stability, a composite control approach by combining nonlinear disturbance observer (NDO) and feedback linearization (FBL) control is proposed. In this paper, the multiple disturbances that act on spacecrafts from flexible appendages, space environment, and unmodelled dynamics are considered as an ‘equivalent’ disturbance. The proposed NDO is used to estimate and compensate for the disturbances through feedforward. Stability and tracking performance of the NDO are then analyzed. Moreover, the stability of the FBL + NDO composite control approach is established through the Lyapunov method. Simulation results show that the NDO can estimate disturbances and reduce the effect of disturbances on spacecrafts through feedforward compensation. Robust dynamic performance and attitude control accuracy are effectively improved.

Keywords

Flexible spacecraft Feedback linearization control Nonlinear disturbance observer Multiple disturbances 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China 10772011, the National Basic Research Program of China (973 Program) 2012CB720003, and the Fundamental Research Funds for the Central Universities YWF-10-01- A22

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.School of Instrumentation Science and Optoelectronics EngineeringBeijing University of Aeronautics and AstronauticsBeijingChina

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