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Design of Fixed-Time Neural Controller for Uncertain Nonstrict-Feedback Systems with Smooth switching functions

Journal of Systems Science & Complexity 2023年第6期36卷 2344-2363页

作者： YANG Jinzi LI Yuanxin TONG Shaocheng State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang110819China College of Science Liaoning University of TechnologyJinzhou121001China

The tracking problem of uncertain nonstrict-feedback nonlinear systems(UNFNS)is examined to develop a novel adaptive neural control scheme to ensure fixed-time convergence.In particular,the challenge associated with the unknown nonlinear function can be overcome through neural network(NN)based estimation.Therefore,an NN-based adaptive fixed-time control scheme is established with only one parameter,using the property of the basis function vector to address the algebraic loop problem.Furthermore,the singularity problem can be solved by incorporating a smooth switching function.A rigorous theoretical analysis is performed to demonstrate that the output signal can track the reference signal within a fixed time and that the signals in the control systems are bounded.Finally,numerical simulations are performed to validate the feasibility of the proposed methodology.

关键词： Backstepping technique fixed-time control neural networks switching function

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Switched Three-Dimensional Decoupling Stabilization of Underactuated Autonomous Underwater Vehicles

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Journal of Shanghai Jiaotong university(Science) 2022年第3期27卷 383-392页

作者：房浩霖张家闻李家旺 Faculty of Maritime and Transportation Ningbo UniversityNingbo 315211ZhejiangChina

A three-dimensional stabilization problem for underactuated autonomous underwater vehicles(AUVs)is addressed in this paper.A novel coordinate transformation form consisting of state modifications and input transformations is introduced such that the whole system is divided into two decoupled one-order subsystems.Some switching functions are presented to further decouple the underactuated dynamics and to produce persistently exciting(PE)signals for those underactuated states.Based on the aforementioned results,a quite simple control law is designed to achieve global three-dimensional asymptotic convergence of all states of underactuated AUVs.Comparative simulations are carried out to validate the effectiveness and performance of the proposed control scheme.

关键词： autonomous underwater vehicle(AUV) underactuated systems three-dimensional stabilization switching function

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Non-Characteristic Harmonics Analysis of the ITER Pulsed Power Supply

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Plasma Science and Technology 2009年第4期11卷 493-498页

作者：杨威许留伟傅鹏卢华伟盛志才 Institute of Plasma Physics Chinese Academy of Sciences

The ITER pulsed power supply system will be operated in non-ideal conditions including an asymmetric firing angle, an unbalanced AC supply and an unbalanced AC side impedance of the transformer. In this study the switching functions approach is used to calcu- late non-characteristic harmonics in ITER, possibly caused by an AC-DC convertor in non-ideal conditions. A PSCAD simulation model is set up to study the non-characteristic harmonics in those non-ideal conditions. It is found that the non-characteristic harmonic does appear and the simulation result is in accordance with the calculating strategy.

关键词： switching function non-characteristic harmonics PSCAD ITER

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Analysis of Higher Order System with Impulse Exciting functions in Z-Domain

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Circuits and Systems 2016年第11期7卷 3951-3970页

作者： Branislav Dobrucký Pavol Štefanec Mariana Beňová Oleg V. Chernoyarov Michal Pokorný Faculty of Electrical Engineering University of ?ilina ?ilina Slovak Republic Department of Radio Engineering Devices and Antenna Systems National Research University Moscow Power Engineering Institute Moscow Russia

This paper deals with mathematical modelling of impulse waveforms and impulse switching functions used in electrical engineering. Impulse switching functions are later investigated using direct and inverse z-transformation. The results make possible to present those functions as infinite series expressed in pure numerical, exponential or trigonometric forms. The main advantage of used approach is the possibility to calculate investigated variables directly in any instant of time;dynamic state can be solved with the step of sequences (T/6, T/12) that means very fast. Theoretically derived waveforms are compared with simulation worked-out results as well as results of circuit emulator LT spice which are given in the paper.

关键词： Impulse Systems switching function Z-Transformation Inverse Z-Transformation Steady State Operation Dynamical State Model Modelling and Simulation

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Design of Sliding Mode Controller for the Position Servo System

Design of Sliding Mode Controller for the Position Servo Sys...

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2011 Chinese Control and Decision Conference（CCDC）

作者： Jing Jiang is with the Automatic Control Department,Shenyang Ligong University,Shenyang,Liaoning Province,China,Ye Yingying is with the Automatic Control Department,Shenyang Ligong University,Shenyang,Liaoning Province,China.

This paper mainly discusses a control algorithm basing on the principle of the sliding mode variable structure control for the position tracking servo system.The method for obtaining switching function and control function is also given.Finally,a hyperbolic tangent function is employed to accelerate the reaching phase and reduce chattering.It can achieve accurate servo tracking in the presence of the disturbance and the plant parameter variation.Simulation results show that the new control algorithm exhibits the better control performance than the classical control method,and the rapidness and robustness of the system are improved.

关键词： Variable structure control Sliding mode switching function Control function

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