Results 41 to 50 of about 17,724,365 (285)

Tracking Design of an Uncertain Autonomous Underwater Vehicle with Input Saturations by Adaptive Regression Matrix-Based Fixed-Time Control

Sensors, 2022
In this study, a simplified model of an autonomous underwater vehicle (AUV) with input saturation based on kinematic and dynamic equations was built. Subsequently, a simplified model of the AUV was used to represent its main dynamic features. In terms of
Hsiu-Ming Wu
doaj   +1 more source

Adaptive Finite-time and Fixed-time Control Design using Output Stability Conditions [PDF]

, 2022
International audienceThe present paper provides a sufficient condition to ensure output finite-time and fixed-time stability. Comparing with analogous researches the proposed result is less restrictive and obtained for a wider class of systems.
Zimenko, Konstantin, Andrey Polyakov, Denis Efimov, Polyakov, Andrey, Efimov, Denis, Konstantin Zimenko   +5 more
core   +1 more source

Sliding Mode Control for Chaotic Systems with Unknown Uncertainties [PDF]

International Journal of Industrial Electronics, Control and Optimization
Objective: In this article, time-varying chaotic systems with uncertainties, including external disturbances, are considered, and sliding mode control (SMC) is used to control such systems. To control these systems, an autonomous differential equation is
Amir Rezaie
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Improved fixed-time consensus of delayed nonlinear leader–follower multi-agent systems

Nonlinear Analysis
This article aims to study the problem of fixed-time consensus for nonlinear leader–follower multi-agent systems (MASs) with time delay. Firstly, a new fixed-time stability lemma is derived, where the condition of inequality contains a time-delayed term.
Mingqiang Meng, Qintao Gan, Ruihong Li, Luke Li, Qiaokun Kang, Hao Chang   +5 more
doaj   +1 more source

Fixed-Time Gradient Dynamics With Time-Varying Coefficients for Continuous-Time Optimization

, 2023
In this article, we propose fixed-time gradient dynamics with time-varying coefficients for continuous-time optimization. We first investigate the Lyapunov stability conditions that allow us to achieve fixed-time stability of the time-varying dynamical ...
Xinghuo Yu (18029455), Andrew Eberhard (18026932), Thuy Lien Nguyen (18306094), Chaojie Li (815056)   +3 more
core  

Neural Network-Based Nonlinear Fixed-Time Adaptive Practical Tracking Control for Quadrotor Unmanned Aerial Vehicles

Complexity, 2020
This brief addresses the position and attitude tracking fixed-time practical control for quadrotor unmanned aerial vehicles (UAVs) subject to nonlinear dynamics.
Jianhua Zhang, Yang Li, Wenbo Fei
doaj   +1 more source

Intelligent Adaptive Reaching Law-Based Arbitrary Fixed-Time SMC for Quadcopter Under Disturbances

Mathematics
This article proposes an intelligent adaptive arbitrary fixed-time sliding mode control (AFxT-SMC) strategy, integrated with an arbitrary fixed-time disturbance observer (AFx-DO), for precise attitude and altitude tracking of quadcopter UAVs. The primary
Ferhat Bodur, Orhan Kaplan, Murat Temiz, Yongwei Zhang, Zhaozong Meng, Nihat Öztürk   +5 more
doaj   +1 more source

Fixed-Time Convergent Guidance Law with Angle Constraint and Autopilot Lag Compensation Using Partial-State Feedback

Aerospace, 2023
In this paper, by accounting for the angle constraint (AC) and autopilot lag compensation (ALC), a novel fixed-time convergent guidance law is developed based on a fixed-time state observer and bi-limit homogeneous technique.
Chen Xu, Yang Wang, Zhiqi Niu, Sheng Luo, Fenghuai Du   +4 more
doaj   +1 more source

Impact of Radiation Therapy on Physical and Psychosocial Health of Adolescents and Young Adults: A Joint Report From the Children's Oncology Group AYA and Radiation Oncology Committees

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Rates of cancer among adolescents and young adults (AYA), age 15–39 years, are increasing. Consequently, radiation oncologists are treating more AYAs who have diagnoses spanning both pediatric and adult practices. Compared to pediatric and older adult patients, AYAs face a unique set of challenges.
Hesham Elhalawani, Rachel K. Peterson, Avani D. Rao, Laurie J. McKenzie, Ahmed Magdy Elmotayam, Leslie Chang, Michael Roth, Susan L. McGovern   +7 more
wiley   +1 more source

Fixed-time regulation of spacecraft orbit and attitude coordination with optimal actuation allocation using dual quaternion

Frontiers in Robotics and AI, 2023
On-orbit service spacecraft with redundant actuators need to overcome orbital and attitude coupling when performing proximity maneuvers. In addition, transient/steady-state performance is required to fulfill the user-defined requirements.
Lichao Sun, Yanpei Huang, Haolin Fei, Bo Xiao, Eric M. Yeatman, Allahyar Montazeri, Ziwei Wang   +6 more
doaj   +1 more source