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Improved Stability Criteria on Discrete-time systems with Time-varying and Distributed Delays

International Journal of Automation and computing 2013年第3期10卷 260-266页

作者： Ting Wang Ming-Xiang Xue Chun Zhang Shu-Min Fei Key Laboratory of Measurement and Control of Complex Systems of Engineering School of Automation Southeast University

This work was supported by National Natural Science Foun- dation of China （Nos. 60905009, 61004032, 61104119, 61174076, and 61172135）, and Jiangsu Province Natural Science Foundation （Nos. SBK201240801 and BK20123... 详细信息

关键词： Discrete-time system global stability interval time-varying delay distributed delay reciprocal convex technique.

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Rotor design techniques for reducing the cogging torque in a novel dual-rotor axial field flux-switching permanent magnet machine

Rotor design techniques for reducing the cogging torque in a...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Li Hao Mingyao Lin Da Xu Wei Zhang Nian Li Key Laboratory of Measurement and Control of Complex Systems of Engineering Southeast University Nanjing China Engineering Research Center for Motion Control of MOE Southeast University Nanjing China

ISBN: (纸本)9781479951635

Dual-rotor axial field flux-switching permanent magnet (DRAFFSPM) machine is a novel permanent magnet (PM) machine which incorporates the merits of both the flux-switching PM machine and the axial field PM machine. The cogging torque of the DRAFFSPM machine is high due to the flux focusing which is caused by the double salient structure. In order to reduce the cogging torque, the influence of the rotor pole width and shape on the cogging torque is analyzed based on the 3D finite element (FE) method. The cogging torque reduction methods, such as the rotor skewing, rotor notching, and rotor pole displacement, etc., are investigated. The results show that increasing the rotor pole width and adopting fan-shaped rotor pole can decrease the cogging torque greatly. The cogging torque can be reduced by ~77% when the rotor pole width and rotor fan-shaped angle are optimized to 15.5 deg. and 3 deg., respectively. The cogging torque can't be decreased by the rotor skewing for DRAFFSPM machine. However, the cogging torque can be reduced by rotor notching and rotor pole displacement.

关键词： Rotors Forging Torque Shape Stator windings Permanent magnet motors

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Periodic behaviors of a discretized twisting algorithm based sliding mode control system

Periodic behaviors of a discretized twisting algorithm based...

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International Workshop on Variable Structure systems, VSS

作者： Yan Yan Xinghuo Yu Changyin Sun Ministry of Education Key Laboratory of Measurement and Control of Complex Systems of Engineering Nanjing China RMIT School of Electrical and Computer Engineering Melbourne VIC AU

In this paper, we show that Euler discretization of the sliding mode control system with twisting algorithm can lead to periodic behaviors. Bounds for periodic orbits are derived, which allow one to estimate the maximum chattering amplitude for a given value of the time step. It is shown that for certain parameter values, there exist arbitrarily long periodic orbits. Theoretical results are illustrated with simulation examples.

关键词： Orbits Trajectory Switches Sliding mode control Extraterrestrial measurements Educational institutions Clocks

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Attitude synchronization for multiple flexible spacecraft based on non-smooth control

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IFAC Proceedings Volumes 2014年第3期47卷 9968-9972页

作者： Haibo Du Yigang He Shihua Li Yingying Cheng Xisong Chen School of Electrical Engineering and Automation Hefei University of Technology Hefei 230009 China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Southeast University Nanjing 210096 China

This paper considers the problem of attitude synchronization for a group of flexible spacecraft based on distributed attitude cooperative control strategy. Based on the backstepping design, non-smooth control, and the neighbor-based design rule, a distributed attitude control law is constructed step by step. Under the proposed control law, it is shown that the attitude synchronization is achieved asymptotically and the induced vibration by flexible appendages is simultaneously suppressed.

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Finite-time saturated controller design for straight line navigation of an agricultural tractor 33

Finite-time saturated controller design for straight line na...

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Proceedings of the 33rd Chinese control Conference, CCC 2014

作者： Jiang, Yuexia Ding, Shihong Zhao, Dean Ji, Wei School of Electrical and Information Engineering Jiangsu University Zhenjiang212013 China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Southeast University Nanjing210096 China

ISBN: (纸本)9789881563842

Finite-time control systems usually have better disturbance rejection property and faster convergence performance. For the linearized dynamics of the linear navigation system of an agricultural tractor, a novel control algorithm based on finite-time control technique and saturation method is proposed. Based upon the presented method, the finite-time saturated controller is designed for the linear navigation of an agricultural tractor, and the global stability for the closed loop system is proved. Meanwhile, the selection of parameters in saturated controller just requires some simple mathematical relationships, and the control method has some potential practical applications. Simulation results also verify the effectiveness of the proposed method. © 2014 TCCT, CAA.

关键词： Tractors (agricultural)

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Mars entry trajectory tracking via constrained multi-model predictive control

Mars entry trajectory tracking via constrained multi-model p...

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Chinese control Conference (CCC)

作者： Chao Wu Shihua Li Jun Yang Lei Guo Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast University Nanjing Jiangsu CN School of Automation Science and Electrical Engineering Beihang University & Institute of Instrument Science and Opto-Electronics Engineering Beijing CN

Tracking law designed for future Mars entry missions is investigated in this article. For precision landing, the nonlinear entry dynamics, complex uncertainties and input saturation constraints are unavoidable problems. Facing these challenges, the Mars entry trajectory tracking scheme via constrained multi-model predictive control (CMPC) is employed. The CMPC is made up of some constrained predictive control (CPC) in different time domain during the Mars entry mission. Each constrained predictive controller consists of a linearized prediction model (obtained by linearizing at different operating point), feedback correction for active model mismatch rejection caused by the complex uncertainties, and constrained rolling optimization for a smooth control input under a saturation constraint. Monte Carlo simulations demonstrate the effectiveness and excellence of the proposed method under the saturation constraint of input and uncertainties of initial state and aerodynamic parameters such as atmospheric density, ballistic coefficient and lift-to-drag ratio.

关键词： Mars Aerodynamics Uncertainty Trajectory Predictive models Vehicles Predictive control

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Global Stability of Cascaded systems with Non-smooth Continuity

Global Stability of Cascaded Systems with Non-smooth Continu...

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第三十二届中国控制会议

作者： Ma Li Li Xuebing Ding Shihong Zhang Jun School of Electrical and Information Engineering Jiangsu University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationSoutheast University

ISBN: (纸本)9781479900305

The local/global Lipschitz continuity is always required when considering the stability of the cascaded systems. Different from the exiting methods proposed in the literature,this paper gives a method to deal with non-smooth cascaded *** using iISS property,some sufficient conditions for global asymptotic stability of the cascaded systems are derived. Then,based upon this,an interesting result of finite-time stability for cascaded systems is further *** proposed methods are verified by some academic examples.

关键词： Cascaded systems Stability Finite-time control

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The design of robust MIMO neural network disturbance observer for multi-variable system

The design of robust MIMO neural network disturbance observe...

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Chinese control Conference (CCC)

作者： Juan Li Shihua Li Shengquan Li Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Southeast University Nanjing Jiangsu CN School of Automation Southeast University Nanjing Jiangsu CN Sch. of Hydraulic Energy & Power Eng. Yangzhou University Yangzhou Jiangsu CN

Multi-variable systems widely exist in the practical engineering control systems whose performances are always severely interrupted by strong disturbances including unmodeled dynamics, parameter variations, couplings and external disturbances. Disturbance observer (DOB) is known as an effective technique to estimate disturbances and has been extensively applied for feed-forward compensation design in the presence of disturbances. Yet many disturbance observer techniques in previous literature are just used for single-input-single-output (SISO) systems or the DOBs can be applied in the multi-variable systems, but the DOBs are still SISO DOBs. A decoupled robust multi-input-multi-output neural network disturbance observer (MNNDOB) is designed for the multi-input-multi-output (MIMO) systems. Simulation results on the mixing tank show that the proposed method has better disturbance estimation performance when there are severe model mismatches compared with the MIMO linear disturbance observer.

关键词： Observers Neural networks MIMO Robustness control systems Adaptation models

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NNDOB-based Composite control for Binary Distillation Column Under Disturbances

NNDOB-based Composite Control for Binary Distillation Column...

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第三十二届中国控制会议

作者： LI Juan CHEN Xisong LI Shihua YANG Jun ZHOU Jiancheng School of Automation Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationP.R.China School of Chemistry and Chemical Engineering Southeast University

ISBN: (纸本)9781479900305

This paper presents a composite disturbance rejection control strategy for high purity binary distillation column with complex characteristics,such as couplings,non-minimum phase,model mismatches and external *** goal of the controller is to get the desired top and bottom compositions in presence of both model mismatches and external *** composite controller includes neural network inverse controller(NNIC) and neural network disturbance observer(NNDOB) both using radial basis fimction network(RBFN).The inverse model of the system is identified by RBFN,whose stability is proved via the Lyapunov fimction *** a rigorous analysis is also given to show why the NNDOB can effectively suppress the *** of the proposed scheme is compared with PID and NNIC schemes in two *** feasibility, effectiveness and disturbance rejection property of the proposed method are demonstrated by the simulation studies.

关键词： Composite controller Disturbance Rejection Neural Network Disturbance Observer Binary Distillation Column.

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A collision-free motion planning method for a redundant manipulator with a constrained task

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) 2013年第SUPPL.2期44卷 98-103页

作者： Xu, Longfei Li, Jun Gan, Yahui Dai, Xianzhong Sun, Wei Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Southeast University Nanjing 210096 China

A self-motion planning method for a redundant manipulator subject to the primary task constraint was proposed based on random generation of joint configurations and depth-first search. Exploiting the self-motion property of a redundant manipulator, a random configuration generation algorithm of a manipulator configuration was proposed for solving a set of joint configurations corresponding to a given end-effector pose and a depth-first search strategy was designed to find a collision-free configuration from the configuration set generated at random. By repeating the process for every pose from the initial to the end one in the task, a collision-free joint path can be obtained eventually. Taking a redundant manipulator of MOTOMAN VA1400 as an example, a simulation study was carried out. The result shows that the method presented is effective.

关键词： Redundant manipulators

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