In this article, a novel adaptive control method based on neural networks is proposed for a class of multiagent systems (MASs) with nonlinear functions and external disturbances. First, the approximation properties of neural networks are used to approximate the MAS partial differential equation (PDE) model with nonlinear terms containing two variables, time t, and spatial variable x. Second, an adaptive controller is constructed to actuate the parabolic MAS to reach consensus under external disturbances. Based on this, the finite-time theorem and special inequalities are applied to prove the stability of the closed-loop system. Thus, MAS that have nonlinear functions and external disturbances are enabled with finite-time consensus. Finally, the effectiveness of the proposed control method is demonstrated by numerical simulations.
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http://dx.doi.org/10.1109/TNNLS.2024.3386663 | DOI Listing |
Mult Scler Relat Disord
January 2025
University of Health Sciences, Bakırköy Prof. Dr. Mazhar Osman Training and Research Hospital for Mental Health and Neurological Disorders, Department of Neurology, Istanbul, Türkiye. Electronic address:
Background: Multiple sclerosis (MS) patients frequently experience gait disturbances, which can be exacerbated in those with vestibular involvement. Various exercise approaches are available to address gait difficulties in this patient population, and the use of vestibular rehabilitation, in particular, has increased recently. However, the effects of this specific exercise approach on gait in MS patients remain unclear.
View Article and Find Full Text PDFISA Trans
January 2025
Graduate School of Intelligent Data Science, National Yunlin University of Science and Technology, Douliou, Yunlin, Taiwan. Electronic address:
Relying on composite nonlinear feedback, an output-feedback controller is robustly addressed in the singular models with uncertainties, disturbances and time-delays. For this purpose, an observer-based compensator is utilized to realize the purpose. In the presence of disturbance and uncertainty, it is demonstrated that the tracking error and the states of the overall system are ultimately bounded.
View Article and Find Full Text PDFOpen Biol
January 2025
Laboratory of Integrative Biology, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czechia.
Epithelia are multicellular sheets that form barriers defining the internal and external environments. The constant stresses acting at this interface require that epithelial sheets are mechanically robust and provide a selective barrier to the hostile exterior. These properties are mediated by cellular junctions which are physically linked with heavily crosslinked cytoskeletal networks.
View Article and Find Full Text PDFPlants (Basel)
January 2025
Departamento de Ciencias Jurídicas, Universidad Técnica Particular de Loja, Loja 1101608, Ecuador.
Epiphytic bryophytes are an important component in terms of the diversity and functioning of montane forests known as biodiversity hotspots. Bryophytes are highly dependent on their external environments because they are sensitive to environmental changes related to disturbance, fragmentation, air pollution, and climate change. The richness and composition of bryophytes in remnants of primary and secondary forests were analyzed, where the richness and cover were recorded on trunk bases of 120 trees.
View Article and Find Full Text PDFSensors (Basel)
January 2025
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China.
Aiming at the control challenges faced by unmanned surface vessels (USVs) in complex environments, such as nonlinearities, parameter uncertainties, and environmental perturbations, we propose a non-singular terminal integral sliding mode control strategy based on an extended state observer (ESO). The strategy first employs a third-order linear extended state observer to estimate the total disturbances of the USV system, encompassing both external disturbances and internal nonlinearities. Subsequently, a backstepping sliding mode controller based on the Lyapunov theory is designed to generate the steering torque control commands for the USV.
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