NDLI: Comprehensive design of uniform robust exact disturbance observer and fixed-time controller for reusable launch vehicles

Content Provider	IET Digital Library
Author	You, Ming Zong, Qun Tian, Bailing Zhao, Xinyi Zeng, Fanlin
Abstract	The comprehensive design of uniform robust exact disturbance observer (UREDO) and fixed-time controller for reusable launch vehicles is investigated. A UREDO which can estimate the disturbance after a fixed-time independent of the initial error is presented. Based on the disturbance estimation, a non-singular terminal sliding mode controller is designed to ensure that the guidance command can be tracked within a fixed-time in the presence of model uncertainties and external disturbances. A proof of the fixed-time convergence of the closed-loop system under the control scheme is derived with complete stability analysis using the Lyapunov technique. The features of the proposed control scheme contain that the disturbance estimation, as well as the attitude tracking, can be achieved within a fixed-time, which is independent of initial conditions and the derivative information of states is not essential, which is valuable in engineering application. Numerical simulations are performed to demonstrate the fixed-time convergence performance of the proposed control scheme.
Starting Page	638
Ending Page	648
Page Count	11
ISSN	17518644
Volume Number	12
e-ISSN	17518652
Issue Number	Issue 5, Mar (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cta/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cta.2017.0466
Journal	IET Control Theory & Applications
Publisher Date	2017-12-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Aerospace Control Attitude Control Attitude Tracking Closed Loop System Closed-loop System Complete Stability Analysis Comprehensive Design Control System Analysis Control System Synthesis Convergence of Numerical Method Engineering Application External Disturbances Fixed-time Controller Fixed-time Convergence Performance Guidance Command Lyapunov Method Lyapunov Technique Military Aircraft Military Control System Model Uncertainties Modelling And Identification Multivariable Control System Nonsingular Terminal Sliding Mode Controller Numerical Method Numerical Simulation Observers Position Control Simulation Spatial Variables Control Stability Stability in Control Theory Synthesis Method Uncertain System Uniform Robust Exact Disturbance Observer UREDO Variable Structure System
Content Type	Text
Resource Type	Article
Subject	Control and Optimization Control and Systems Engineering Human-Computer Interaction Electrical and Electronic Engineering Computer Science Applications

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