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access icon free Boundary output feedback control of a flexible spacecraft system with input constraint

  • Author(s): Yun Fu 1 ; Yu Liu 1, 2 ; Daoping Huang 1
    • View affiliations
  • Source: Volume 12, Issue 5, 27 March 2018, p. 571 – 581
    DOI:  10.1049/iet-cta.2017.0567 , Print ISSN 1751-8644, Online ISSN 1751-8652
© The Institution of Engineering and Technology
Received 23/05/2017, Accepted 11/12/2017, Revised 14/10/2017, Published 12/12/2017

This study is concerned with vibration control of a flexible spacecraft system in the presence of disturbances and input saturation constraint. The dynamics of the spacecraft consisting of a rigid body and two flexible appendages is presented by the coupled partial differential equations and ordinary differential equations. The first boundary state feedback control is adopted when the spacecraft system states can be measured. The second boundary output feedback control is employed when there exists the unmeasurable state in the proposed control law. A high-gain observer is developed to estimate the unmeasurable system state, two auxiliary systems are designed to prevent the presence of input saturation from destroying the system performance and two disturbance observers are established to handle the unknown boundary disturbances. The well-posedness and stability of the spacecraft system are proved. Simulation results are presented to demonstrate the effectiveness of the proposed control schemes.

Inspec keywords: vibration control; partial differential equations; state feedback; aerospace control; observers; vehicle dynamics

Other keywords: system performance; control law; high-gain observer; coupled partial differential equations; spacecraft system stability; ordinary differential equations; boundary state output feedback control; flexible appendages; flexible spacecraft system; vibration control; rigid body; boundary disturbances; disturbance observers; spacecraft dynamics; input saturation constraint

Subjects: Vibrations and shock waves (mechanical engineering); Numerical analysis; Vehicle mechanics; Aerospace control; Mechanical variables control; Simulation, modelling and identification; Differential equations (numerical analysis)

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