Results 31 to 40 of about 24,851,358 (308)

A Robust Fixed-Time Sliding Mode Control for Quadrotor UAV

Algorithms, 2023
This paper proposes a robust algorithm based on a fixed-time sliding mode controller (FTSMC) for a Quadrotor aircraft. This approach is based on Lyapunov theory, which guarantees system stability.
Jairo Olguin-Roque, Sergio Salazar, Iván González-Hernandez, Rogelio Lozano   +3 more
doaj   +1 more source

Fixed-Time Parameter Adaptation for Safe Control Synthesis

CoRR, 2022
This paper introduces a parameter adaptation-based control law for a class of nonlinear, control-affine, safety-critical systems subject to additive, parameter-affine model uncertainty. It is shown that the uncertainty is learned in fixed-time, i.e., within a finite time independent of the initial parameter estimates, without requiring persistence of ...
Mitchell Black 0001, Ehsan Arabi, Dimitra Panagou   +2 more
openaire   +3 more sources

Fixed-time attitude tracking control for rigid spacecraft

Automatica, 2020
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
An-Min Zou, Krishna Dev Kumar, Anton H. J. de Ruiter   +2 more
openaire   +4 more sources

Fixed-Time Trajectory Tracking Control of Fully Actuated Unmanned Surface Vessels with Error Constraints

Journal of Marine Science and Engineering
This paper proposes a fixed-time prescribed performance control technique to address the challenge of precise trajectory tracking control for unmanned surface vessels (USVs) in the presence of external time-varying disturbances and input saturation.
Bowen Sui, Jianqiang Zhang, Zhong Liu, Junbao Wei   +3 more
doaj   +1 more source

Fixed‐time fault‐tolerance attitude tracking control for spacecraft without unwinding

IET Control Theory & Applications, 2023
In this paper, the attitude tracking control problem is investigated for rigid spacecraft subjected to external disturbance, inertia uncertainties, and actuator faults. The rotation matrix is used to model the spacecraft attitude control system which can
Q. Huang, Y. Zhang
doaj   +1 more source

Fixed-Time Homogeneous Integral Controller

IFAC-PapersOnLine, 2018
Abstract We propose a homogeneous integral controller with positive homogeneity degree, for systems with relative degree two and three. Its design and the convergence proof is achieved by the construction of an explicit homogenous Lyapunov function. A combination of this controller, with a discontinuous one developed by the authors in a previous work,
Angel Mercado-Uribe, Jaime A. Moreno
openaire   +1 more source

Understanding fixed effects in human well-being [PDF]

, 2009
In studies of subjective well-being, economists and other researchers typically use a fixed or random effect estimation to control for unobservable heterogeneity across individuals.
Boyce, Christopher J., Boyce, Christopher J, Christopher J. Boyce   +2 more
core   +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

Ovarian Sex Cord Stromal Tumors in Children and Adolescents—The European Standard Clinical Practice Recommendations

Pediatric Blood &Cancer, EarlyView.
ABSTRACT As part of the European Cooperative Study Group for Paediatric Rare Tumours initiative, we developed standard clinical practice guidelines for ovarian sex cord stromal tumors, based on comprehensive national and international cohort analyses, literature review, and a final expert consensus conference.
Dominik T. Schneider, Kris‐Ann Schultz, Nora Schnitzler, Michael Abele, Tal Ben‐Ami, Ewa Bien, Gianni Bisogno, Ines B. Brecht, Maja Cesen, Andrea Ferrari, Michaela Kuhlen, Malgorzata A. Krawczyk, Ricardo Lopez‐Almaraz, Yves Reguerre, Calogero Virgone, Daniel Orbach   +15 more
wiley   +1 more source

Time-Synchronized Fault-Tolerant Control for Robotic Manipulators

Mathematics
This article proposes a time-synchronized fault-tolerant convergence control method for n-degree-of-freedom robotic manipulators. The main challenge lies in driving the tracking errors of all joints to converge simultaneously, especially in the presence ...
Duansong Wang, Gang Zhang, Rui Chen, Jinzhong Zhang, Tan Zhang   +4 more
doaj   +1 more source