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FRACTIONAL ORDER TUBE model reference adaptive control FOR A CLASS OF FRACTIONAL ORDER LINEAR SYSTEMS

INTERNATIONAL JOURNAL OF APPLIED MATHEMATICS AND COMPUTER SCIENCE 2020年第3期30卷 501-515页

作者： Balaska, Hanane Ladaci, Samir Djouambi, Abdelbaki Schulte, Horst Bourouba, Bachir Univ Oum El Bouaghi LGEA Lab Dept Elect Engn Oum El Bouaghi 04000 Algeria Natl Polytech Sch Constantine Dept Elect Elect Engn & Automat Constantine 25100 Algeria Mentouri Univ Constantine 1 Dept Elect SP LAB Lab Route Ain Elbey Constantine 25000 Algeria Univ Appl Sci HTW Berlin Sch Engn Energy & Informat Wilhelminenhofstr 75A D-12459 Berlin Germany Setif 1 Univ Dept Elect Engn BP El Bez Stif 19000 Algeria

We introduce a novel fractional order adaptive control design based on the tube model reference adaptive control (TMRAC) scheme for a class of fractional order linear systems. By considering an adaptive state feedback control configuration, the main idea is to replace the classical reference model with a single predetermined trajectory by a fractional order performance tube guidance model allowing a set of admissible trajectories. Besides, an optimization problem is formulated to compute an on-line correction control signal within specified bounds in order to update the system performance while minimizing a control cost criterion. The asymptotic stability of the closed loop fractional order control system is demonstrated using an extension of the Lyapunov direct method. The dynamical performance of the fractional order tube model reference adaptive control (FOTMRAC) is compared with the standard fractional order model reference adaptive control (FOMRAC) strategy, and the simulation results show the effectiveness of the proposed control method.

关键词： fractional order linear system model reference adaptive control fractional adaptive control optimization performance tube fractional order TMRAC

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Active vibration isolation by model reference adaptive control

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IFAC-PapersOnLine 2020年第2期53卷 9144-9149页

作者： W.B.J. Hakvoort G.J. Boerrigter M.A. Beijen University of Twente Faculty of Engineering Technology Department of Mechanics of Solids Surfaces and Systems PO Box 217 7500 AE Enschede The Netherlands DEMCON Advanced Mechatronics Institutenweg 25 7521 PH Enschede The Netherlands

This paper proposes model reference adaptive control (MRAC) to actively isolate payloads from floor vibrations and direct disturbance forces. adaptive feedforward control is used to counteract measured disturbances, whereas an adaptive feedback controller suppresses unmeasured disturbances using skyhook damping. In the considered rigid single degree of freedom system, the ideal controller gains only depend on the stiffness and damping properties of the suspension. The MRAC strategy is validated experimentally on a hard mounted vibration isolation system. Attenuation of acceleration levels beyond -40 dB are obtained in a wide frequency band 5-100Hz and the root-mean-square (RMS) acceleration in the frequency region of interest (0.1 - 100 Hz) is reduced 32 times with respect to passive isolation.

关键词： model reference adaptive control MRAC active vibration isolation high-precision mechatronics disturbance feedforward control

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model reference adaptive Current control Method for Dual Three Phase Permanent Magnet Synchronous Machine 13

Model Reference Adaptive Current Control Method for Dual Thr...

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13th IEEE Energy Conversion Congress and Exposition (IEEE ECCE)

作者： Chowdhury, Anik Haque, Md Ehsanul Das, Shuvajit Boler, Okan Sozer, Yilmaz Univ Akron Dept ECE Akron OH 44325 USA

ISBN: (纸本)9781728151359

A model reference adaptive current control (MRAC) method for the dual three phase permanent magnet synchronous machine is proposed in this paper. Although predictive current control shows an excellent transient performance compared to the PI controller method, its steady state performance can deteriorate if there is any error in estimating the machine's parameters. The proposed MRAC method estimates the disturbance due to the error in the parameters and feeds the error forward to the controller to eliminate it. While maintaining the predictive control's good transient performance, the proposed method can also improve the predictive control's steady state performance under parameter variation. As a result, it can be easily implemented along with the existing predictive current control. Theoretical background and the stability of the proposed system is derived. Simulation results are provided to validate the performance of the proposed method.

关键词： Dual three phase Permanent magnet synchronous machine Predictive control PI control model reference adaptive control Transient Response

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Switched Fractional Order model reference adaptive control for Unknown Linear Time Invariant Systems *

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IFAC-PapersOnLine 2020年第2期53卷 3731-3736页

作者： Norelys Aguila-Camacho Javier A. Gallegos Departamento de Electricidad Facultad de Ingeniería Universidad Tecnológica Metropolitana Av. José Pedro Alessandri 1242 Stgo Chile Department of Electrical Engineering Universidad de Chile Av. Tupper 2007 Stgo Chile

This paper presents a model reference adaptive controller for linear time invariant systems with unknown parameters. The adaptive laws used to estimate the controller parameters are based on fractional differential equations, whose orders are switched among a fractional value in the interval (0,1) and 1 at certain time instants. Boundedness of the signals in the resulting controlled system is proved using recent results. A simulation study is provided for a second order system to show how the proposed control strategy can improve the behavior and decrease the control energy used, compared to the classic model reference adaptive controllers and fractional order model reference adaptive controllers with non-switched adaptive laws.

关键词： control energy Fractional control model reference adaptive control Switching theory

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Direct Uncertainty Minimization in model reference adaptive control: Experimental Results

Direct Uncertainty Minimization in Model Reference Adaptive ...

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AIAA Science and Technology (SciTech) Forum and Exposition

作者： Gruenwald, Benjamin C. Yucelent, Tansel Muse, Jonathan A. Univ S Florida Dept Mech Engn Tampa FL 33620 USA Univ S Florida Lab Auton Control Informat & Syst LAOIS Tampa FL 33620 USA Air Force Res Lab Autonomous Control Branch Aerosp Syst Directorate Wright Patterson AFB OH 45433 USA

ISBN: (数字)9781624105784

ISBN: (纸本)9781624105784

This paper presents an application of a recently developed direct uncertainty minimization approach for model reference adaptive control on a dual-rotor helicopter testbed. Specifically, the direct minimization approach uses a gradient minimization procedure to construct modification terms that are included in the adaptive control law and the update laws to improve the closed-loop system performance. These modification terms are activated when the system error between the uncertain dynamical system and a given reference model capturing the desired closed-loop dynamical system behavior is nonzero and then vanish as the system reaches steady-state. The experimental results in this paper demonstrate the capability of the direct minimization approach to improve the closed-loop system performance and enforce performance bounds.

关键词： model reference adaptive control Systematic errors System performance system behavior control law Nonzero Mentoring DYNAMICAL SYSTEMS adaptive control Helicopter rotors Closed loop systems

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A Grid Integrated Bi-Directional Dual Active Bridge Converter with model reference adaptive control Based Power Flow controller

A Grid Integrated Bi-Directional Dual Active Bridge Converte...

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National Power Electronics Conference

作者： Mitra, Sanjib Kumar Karanki, Srinivas Bhaskar IIT Bhubaneswar Sch Elect Sci Bhubaneswar India

ISBN: (纸本)9781728144283

The energy storage integration to grid using a dual active bridge DC - DC converter requires a promising controller for its efficient operation. In this paper a model reference adaptive controller (MRAC) for power flow control of a grid connected bi-directional neutral point clamped (NPC) structure based dual active bridge converter is introduced. The converter modelling is based on harmonic analysis. The controller is simple to implement and matches the power demand by the grid from the energy storage. The system performance is verified in MATLAB/Simulink platform for 5kW DAB converter and the results validates its satisfactory dynamic response for different disturbances in the system.

关键词： DC-DC converter dual active bridge model reference adaptive control harmonic based modelling power flow controller

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A Generalization for model reference adaptive control and Robust model reference adaptive control adaptive Laws for a Class of Nonlinear Uncertain Systems with Application to control of Wing Rock Phenomenon

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INTERNATIONAL JOURNAL OF ENGINEERING 2020年第11期33卷 2372-2383页

作者： Roshanian, J. Rahimzadeh, E. KN Toosi Univ Technol Dept Aerosp Engn Tehran Iran

Lyapunov's direct method is a primary tool for designing model reference adaptive control (MRAC) and robust MRAC schemes. In general, Lyapunov function candidates contain two categories of quadratic terms. The first category includes the system tracking error quadratic terms or, in some cases, consist of the system state quadratic terms. The second consists of the parameter estimation error quadratic terms. To design MRAC and Robust MRAC systems, researchers have used a limited variety for choosing quadratic terms. In this study, we consider a general form for the tracking error quadratic terms. We consider a strictly increasing function that belongs to the class of c(1), which is a function of state tracking error quadratic terms. It yields a general structure for stable adaptive laws for updating controller parameters. For the MRAC scheme, the global asymptotic stability of the closed-loop system and stability and uniform bounded tracking of robust MRAC schemes are guaranteed. To evaluate the performance of the designed controllers, we consider the single DOF wing rock dynamics.

关键词： Lyapunov's Direct Method model reference adaptive control Robust model reference adaptive control General adaptive Laws Strictly Increasing Function Wing Rock

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Switched Fractional Order model reference adaptive control for first order plants

Switched Fractional Order Model Reference Adaptive Control f...

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IEEE CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON)

作者： Aguila-Camacho, Norelys Gallegos, Javier A. Univ Tecnol Metropolitana Dept Elect Av Jose Pedro Alessandri 1242 Stgo Chile Univ Chile Dept Elect Engn Av Tupper 2007 Stgo Chile

ISBN: (纸本)9781728131856

This paper presents a model reference adaptive controller for first order plants with unknown parameters. The adaptive laws used to estimate the controller parameters are based on fractional differential equations, whose orders are switched among a fractional value in the interval (0, 1) and 1 at a certain time instant T. Boundedness of the signals in the resulting controlled system is proved using recent results. A simulation study is provided to show how the proposed control strategy can improve the behavior of the controlled system and decrease the control energy used, compared to the classic model reference adaptive controllers and fractional order model reference adaptive controllers with non-switched adaptive laws.

关键词： control energy Fractional control model reference adaptive control Switching theory

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model reference adaptive control for a Class of Aircraft with Actuator Saturation 37

Model Reference Adaptive Control for a Class of Aircraft wit...

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37th Chinese control Conference (CCC)

作者： Chen, Jiao Wang, Jiangyun Wang, Weihong Beihang Univ Sch Automat Sci & Elect Engn Beijing 100191 Peoples R China

ISBN: (纸本)9789881563958

model reference adaptive control (MRAC) is known as a proper method to handle uncertainties of systems and achieve precision command tracking. However, actuator saturation of aircraft limits the ability of the adaptive controller in practice. In this paper, a modified automatic control architecture is presented for a class of aircraft in the presence of input saturation. The proposed controller is based on model reference adaptive control augmented with a modem anti-windup (AW) compensator. First, a standard MRAC with integral state feedback is described. Second, a Riccati-based AW compensator is employed to solve the input saturation problem. Finally, the control technique is applied to control the vertical acceleration of the aircraft with significant uncertainty in control effectiveness and matched uncertainties. Simulation results verify the performance of proposed method.

关键词： model reference adaptive control Actuator saturation Anti-windup Compensator Aircraft

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model reference adaptive control allocation for constrained systems with guaranteed closed loop stability

arXiv

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arXiv 2019年

作者： Tohidi, Seyed Shahabaldin Yildiz, Yildiray Kolmanovsky, Ilya Mechanical Engineering Department Bilkent University Ankara06800 Turkey Department of Aerospace Engineering University of Michigan Ann ArborMI48109 United States

This paper proposes an adaptive control allocation approach for uncertain over-Actuated systems with actuator saturation. The proposed method does not require uncertainty estimation or a persistent excitation assumption. Using the element-wise non-symmetric projection algorithm, the adaptive parameters are restricted to satisfy certain optimality conditions leading to overall closed loop system stability. Furthermore, a sliding mode controller with a time-varying sliding surface, working in tandem with the adaptive control allocation, is proposed to guarantee the outer loop stability and reference tracking in the presence of control allocation errors and disturbances. Simulation results are provided, where the Aerodata model in Research Environment is used as an over-Actuated system with actuator saturation, to demonstrate the effectiveness of the proposed method. Copyright © 2019, The Authors. All rights reserved.

关键词： model reference adaptive control

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