Journal ArticleDOI
Rotation matrix based finite-time attitude synchronization control for spacecraft with external disturbances.
TLDR
A modified control law is proposed, in which the adaptive law is applied to estimate the unknown value online of the finite-time attitude synchronization control problem for Spacecraft formation flying with external disturbances.Abstract:Â
This paper investigates the anti-unwinding finite-time attitude synchronization control problem for Spacecraft formation flying with external disturbances. Two finite-time controllers are designed based on rotation matrix and terminal sliding mode method. By designing a novel sliding mode surface, the first controller is developed when the upper bound of the external disturbances can be exactly known. However, this value is not always available in reality. In addition, the direct use of the upper bound of the external disturbances can result in the chattering problem. For the purpose of overcoming the disadvantage of the first controller, a modified control law is proposed, in which the adaptive law is applied to estimate the unknown value online. Theoretical analysis and numerical simulations are presented to demonstrate the validity of the proposed controllers.read more
Citations
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Globally stabilizing saturated attitude control in the presence of bounded unknown disturbances
TL;DR: In this article, a smooth attitude-stabilizing control law is derived from which known limits on the control authority of the system are rigorously enforced, and unknown disturbance torques, assumed to be of lesser magnitude than the control limits, are included in the formulation.
Journal ArticleDOI
Fixed-time neural network trajectory tracking control for underactuated surface vessels
TL;DR: A robust fixed-time trajectory tracking controller for underactuated surface vessels (USVs) suffering from unmodeled dynamics and external disturbances and the Minimum-Learning-Parameter based neural network and adaptive updating laws are adopted.
Journal ArticleDOI
Distributed Fixed-Time Output-Feedback Attitude Consensus Control for Multiple Spacecraft
TL;DR: This article investigates the problem of distributed fixed-time attitude consensus control for multiple spacecraft when only a subset of spacecraft has access to a common reference attitude and angular velocity and proposes two distribution control schemes under the mild assumption that there exists a path from the virtual leader to any follower and the communication topology among followers is undirected.
Journal ArticleDOI
Finite-time synchronization of hyperchaotic systems based on feedback passivation
TL;DR: A feedback is designed such that it yields finite-time stability for the zero-dynamics of the synchronization errors and is transformed into a finite- time passive system by an additional feedback.
Journal ArticleDOI
Finite-Time Trajectory Tracking Control for Uncertain Underactuated Marine Surface Vessels
TL;DR: In this paper, an adaptive trajectory tracking control problem for an underactuated marine surface vessel (MSV) suffering from the external disturbance and parameter uncertainties is addressed. And an adaptive tracking controller is developed such that sway and yaw velocities can converge to the desired ones in finite time.
References
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Journal ArticleDOI
Adaptive attitude tracking control for rigid spacecraft with finite-time convergence
Kunfeng Lu,Yuanqing Xia +1 more
TL;DR: The proposed FNTSM control laws (FNTSMCLs) by employing FNTSMS associated with adaptation provide finite-time convergence, robustness, faster, higher control precision, and they are chattering-free.
Journal ArticleDOI
Neural Networks-Based Adaptive Finite-Time Fault-Tolerant Control for a Class of Strict-Feedback Switched Nonlinear Systems
TL;DR: It is proved that under the presented control strategy, the system output tracks the reference signal in the sense of finite-time stability, the first time to handle the fault tolerant problem for switched system while the finite- time stability is also necessary.
Journal ArticleDOI
Attitude Synchronization of a Group of Spacecraft Without Velocity Measurements
TL;DR: This work considers the coordinated attitude control problem for a group of spacecraft, without velocity measurements, and designs a velocity-free attitude tracking and synchronization control scheme, that allows the team members to align their attitudes and track a time-varying reference trajectory (simultaneously).
Journal ArticleDOI
Adaptive Neural Network Control of a Flapping Wing Micro Aerial Vehicle With Disturbance Observer
TL;DR: A Lyapunov function is proposed to prove the closed-loop system stability and the semi-global uniform ultimate boundedness of all state variables and a series of simulation results indicate that proposed controllers can track desired trajectories well via selecting appropriate control gains.
Journal ArticleDOI
Neural Networks-Based Adaptive Control for Nonlinear State Constrained Systems With Input Delay
TL;DR: An appropriate barrier Lyapunov function and an opportune backstepping design are used to avoid the constraint violation, and the Pade approximation and an intermediate variable are employed to eliminate the effect of the input delay.