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检索条件"任意字段=Symposium on Nonlinear Control and Observer Design"

共 495 条记录，以下是161-170 订阅

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Interval observers for Linear Impulsive Systems

Interval Observers for Linear Impulsive Systems

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10th IFAC symposium on nonlinear control Systems (NOLCOS)

作者： Degue, Kwassi H. Efimov, Denis Richard, Jean-Pierre Inria Non A Team Pk Sci Haute Borne40 Ave Halley F-59650 Villeneuve Dascq France Ecole Cent Lille CHIStAL UMR CNRS 9189 BP 48Cite Sci F-59651 Villeneuve Dascq France ITMO Univ Dept Control Syst & Informat 49 Kronverkskiy Ave St Petersburg 197101 Russia Polytech Montreal Dept Elect Engn Montreal PQ H3T 1J4 Canada GERAD Montreal PQ H3T 1J4 Canada

The problem of interval observer design is studied for a class of linear hybrid systems. Several observers are designed oriented on different conditions of positivity and stability for estimation error dynamics. Effciency of the proposed approach is demonstrated by computer experiments for academic and bouncing ball systems. (C) 2016, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Interval observers Hybrid systems Stability analysis

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Lyapunov Functions for Continuous and Discontinuous Differentiators

Lyapunov Functions for Continuous and Discontinuous Differen...

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10th IFAC symposium on nonlinear control Systems (NOLCOS)

作者： Cruz-Zavala, Emmanuel Moreno, Jaime A. Univ Guadalajara Ctr Univ Ciencias Exactas & Ingn Dept Ciencias Comp Guadalajara Jalisco Mexico Univ Nacl Autonoma Mexico Elect & Comp Inst Ingn Ciudad De Mexico Mexico

Given a (differentiable) signal it is an important task for many applications to estimate on line its derivatives. Some well known algorithms to solve this problem include the (continuous) high-gain observers and (discontinuous) Levants exact differentiators. In this work we present a family of homogeneous differentiators, encompassing these two algorithms, and we propose a unified smooth Lyapunov function, that allows a common framework to study their convergence and performance analysis. (C) 2016, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Observability and observer design Lyapunov Stability Methods Variable Structure control and Sliding Mode

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VFA robust control of an anaerobic digestion pilot plant: experimental implementation

VFA robust control of an anaerobic digestion pilot plant: ex...

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11th IFAC symposium on Dynamics and control of Process Systems including Biosystems

作者： Garcia-Sandoval, J. P. Mendez-Acosta, H. O. Gonzalez-Alvarez, V. Schaum, A. Alvarez, J. CUCEI Univ Guadalajara Dept Ingn Quim Calz Gral Marcelino Garcia Barragan 1451 Guadalajara 44430 Jalisco Mexico Univ Kiel Chair Automat Control Kiel Germany Univ Autonoma Metropolitana Iztapalapa Dept Ingn Proc & Hidraul Ciudad De Mexico DF Mexico

In this work, an experimental implementation of a model based output feedback (OF) scheme applied to regulate the volatile fatty adds concentration of an anaerobic digestion pilot plant is presented. The OF scheme was developed within a global nonlinear dynamics framework, resulting in an interlaced control-observer design in the light of passivity, observability, and bifurcation properties. From a industrial control perspective, the resulting OF scheme is a. saturated PI controller with: (i) systematic construction and tuning and (ii) nonlocal robust stability conditions in terms of control gains and limits. Experimental results demonstrate the applicability, robustness and reliability of the OF control scheme in a real environment under several load disturbances, severe uncertainties and typical operational failures. (C) 2016, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Waste treatment Dynamic output feedback Anaerobic Digestion real-time control

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control of nonlinear systems using filtered high-gain observer

Control of nonlinear systems using filtered high-gain observ...

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International symposium on Flexible Automation (ISFA)

作者： Tong Ma Jiaxing Che Chengyu Cao University of Connecticut Storrs CT US

ISBN: (纸本)9781509034680

This paper gives a special design of output feedback controller using low-pass filtering high-gain observer for a class of nonlinear systems where nonlinearities satisfy a semiglobal Lipschitz condition. The presence of high-gain observer in the adaptive law delivers a good property of disturbance rejection at the cost of peaking phenomenon as well as reduced robustness. The insertion of low-pass filter at the input signals overcomes the peaking phenomenon and makes the high-gain observer robust to uncertainties in modeling the nonlinear functions. In this way, the proposed technique guarantees that the output feedback controller stabilizes the system and achieves good tracking when the observer gain is sufficiently high. The simulation results demonstrate the high efficiency of our novel design which ensures good tracking for given command with guaranteed robustness.

关键词： observers Low-pass filters Output feedback Adaptive control Robustness Uncertainty Delay effects

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Disturbance-accommodating control-based individual blade pitch control design for two-bladed turbines 34th

Disturbance-accommodating control-based individual blade pit...

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34th Wind Energy symposium, 2016

作者： Wang, Na Wrighty, Alan D. Balasz, Mark J. The National Renewable Energy Laboratory GoldenCO80401 United States National Renewable Energy Laboratory GoldenCO80401 United States Embry-Riddle Aeronautical University Aerospace Engineering Department Daytona BeachFL32114 United States

ISBN: (纸本)9781624103957

We developed individual-pitch controls (IPC) based on a disturbance-accommodating control (DAC) for both two- and three-bladed wind turbines;the results for the twobladed rotor are discussed in the paper. We then compared it to a proportional-integral (PI) collective-pitch control (CPC) and an IPC based on multiblade coordinates (MBCs). The DAC-based IPC controller is a multi-input and multi-output (MIMO) state-space controller and is designed for the two-bladed controls Advanced Research Turbine (CART2) to regulate rotor speed above rated and to mitigate an asymmetrical once-per-revolution(1P) blade-root flapwise-bending load. The two-rotational-blade turbine model is transformed into a symmetric-asymmetric model. DAC is then applied to the transformed turbine model, where wind disturbances are modeled as a collective horizontal component and a dieffrential linear shear component, respectively. An observer is required and was developed for the DAC to estimate turbine and disturbance states using generator speed measurement and blade-root flapwise-bending moment measurements. Therefore, the wind disturbance model is incorporated in the controller loop to reject the wind disturbance effect on turbine output. The actuator dynamic has been considered in the design process to compensate actuator phase delay. The controller is verified with a nonlinear FAST CART2 turbine model and both uniform and turbulent windfields. The simulation study indicates the effectiveness of the proposed control methodology and shows improved performance on rotor speed regulation and 1P load reduction. © 2016 American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： controllers

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A novel completed LPV controller and observer scheme in order to control nonlinear compartmental systems

A novel completed LPV controller and observer scheme in orde...

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International symposium on Intelligent Systems and Informatics (SISY)

作者： György Eigner Péter Pausits Levente Kovács Physiological Controls Group Óbuda University Budapest Hungary Research and Innovation Center of Óbuda University Óbuda University Budapest Hungary

The purpose of this study is to introduce a novel ”completed” LPV controller and observer design approach for control of particular class of nonlinear systems. The developed tools allow to use classical linear controller design theorems via LPV framework without the advanced Linear Matrix Inequality (LMI) theorems. The developed method combines the classical state feedback theorems and a supplementary controller and observer structure which basis is the special properties of the parameter space of the linear parameter varying (LPV) system. The main benefit of the proposed method is that the controller design does not require highly advanced mathematical tools and high computational capacity. We have proven the usability of the method in case of a highly nonlinear compartmental model. The results have shown that the completed LPV controller is able to handle the system with good performance.

关键词： observers Linear systems Mathematical model nonlinear systems State feedback Eigenvalues and eigenfunctions Physiology

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nonlinear controller design for wall inspection by a quad rotor helicopter under wind disturbance

Nonlinear controller design for wall inspection by a quad ro...

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International Electronics symposium (IES)

作者： Ting Tsan Naoki Uchiyama Oliver Sawodny Department of Mechanical Engineering Toyohashi University of Technology Toyohashi Aichi Japan Institute for System Dynamics University of Stuttgart Stuttgart Germany

ISBN: (纸本)9781509016419

This paper proposes a nonlinear control system for a quad rotor helicopter that aims to conduct wall inspection. Because wind reaction from a wall is significant when a helicopter approaches to the wall for its inspection, a robust controller is required. Firstly, the dynamics are derived by the Newton-Euler approach. A reference model with a cascaded control loop system including an inner loop for linearization and an outer loop for stabilization is designed. The inner loop uses feedback linearization. The outer loop uses state feedback control and a prefilter for stabilizing the linearized and decoupled multiple input and multiple output (MIMO) system. Unknown wind disturbances are considered and compensated by using a combined state and disturbance observer. The reference model generates a reference input for an embedded controller of a real plant. This proposed control system directly integrates measured distance into a feedback loop. Simulation results show the effectiveness of the nonlinear controller and observer.

关键词： control systems observers Rotors Inspection MIMO Helicopters Mathematical model

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Hybrid nonlinear observer for Inertial Navigation

Hybrid nonlinear observer for Inertial Navigation

引用

IEEE International symposium on Industrial Electronics (ISIE)

作者： F. Alonge F. D'Ippolito A. Gargano A. Sferlazza Department DEIM Viale delle scienze University of Palermo Palermo Italy

This paper considers the problem of designing an observer for navigation and localization of inertial systems. Since the measurement systems used in this field have a low update rate with respect to the control algorithm, the design of a suitable observer with sampled measurements is required. Here a hybrid non-linear observer is proposed, combining two different observers with different characteristics. A theoretical treatment is given in order to prove the convergence of the observer and it will be contextualized in the framework of the hybrid systems, providing an elegant setting for the proposed solution. Finally experimental results show the feasibility of the proposed observer and the good behaviors in terms of estimation error that can be achieved.

关键词： observers Mathematical model Global Positioning System Inertial navigation Kalman filters Position measurement control systems

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Interval observers for nonlinear systems with appropriate output feedback

Interval observers for nonlinear systems with appropriate ou...

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SICE International symposium on control Systems (ISCS)

作者： Hiroshi Ito Thach Ngoc Dinh Department of Systems Design and Informatics Kyushu Inst. Technology Japan Thach Ngoc Dinh is an International Research Fellow of the Japan Society for the Promotion of Science at Kyushu Institute of Technology Fukuoka Japan

The problem of designing interval observers for nonlinear systems exposed to disturbances is addressed in this paper. Intervals in which components of the state vector reside in are estimated by the interval observer consisting of two Luenberger-type observers making use of the information of the range of the initial state and the disturbances. The main feature of the proposed method is to encompass a larger class of nonlinearities than previously existing approaches. This paper demonstrates that an integral input-to-state stability (iISS) framework not only accomplishes this goal, but also provides us with robustness of convergence with respect to the disturbances.

关键词： observers nonlinear systems Convergence Servers Feedback control Output feedback

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Temporal solution-based output observer design for single output LTI systems

Temporal solution-based output observer design for single ou...

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IEEE International symposium on Environment Friendly Energies and Applications (EFEA)

作者： P. Canyelles-Pericas R. Binns K. Busawon Nonlinear Control Group University of North umbria at Newcastle UK

ISBN: (纸本)9781509007509

In this paper, we present an output observer for single output linear time invariant (LTI) systems based on the temporal state solution of the system. The aim of an output estimator/observer is to reconstruct the output of the system for various purposes, namely fault detection, filtering and output stabilisation among others. A distinctive feature of this observer is that time variable is used as input in the observer equation. Proper transformations are employed to avoid the inversion of large matrices involved in the system's solution computation. Numerical simulations are presented with and without noise presence.

关键词： observers Linear systems Fault detection Mathematical model Numerical simulation Filtering Time series analysis

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