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检索条件"机构=Mechatronics and Control Engineering"

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control-oriented modelling of wind turbines using a Takagi-Sugeno model structure

Control-oriented modelling of wind turbines using a Takagi-S...

引用

IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Sören Georg Horst Schulte Harald Aschemann Control Group Department of Engineering HTW Berlin Berlin Germany Head of Control Group HTW Berlin Berlin Germany Chair of Mechatronics Universität Rostock Rostock Germany

ISBN: (纸本)9781467315074

For a horizontal-axis wind turbine (HAWT), a dynamic nonlinear model with four degrees of freedom is derived and transformed into a Takagi-Sugeno (TS) model structure using the sector nonlinearity approach. Thereby, an exact transformation of the nonlinear model is obtained as a weighted combination of linear models. This structure allows for a convenient design of controller and observer structures. The maps of the rotor thrust and torque coefficients can be implemented in the model as look-up tables or, alternatively, as analytical nonlinear functions. Open-loop simulation results of the derived TS model for a reference model turbine are compared to those obtained with the aero-elastic code FAST. The small deviations obtained demonstrate the high model quality of the control-oriented TS model. In future work, the derived TS model shall be used as a basis for the design of fault detection and isolation (FDI) concepts.

关键词： Wind turbines Aerodynamics Rotors Mathematical model Poles and towers Generators Blades

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Study of a novel bi-stable and easy integrated MEMS ETBS

Study of a novel bi-stable and easy integrated MEMS ETBS

引用

IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

作者： Yue Zhao Wenzhong Lou Dongguang Li National Key Laboratory of Mechatronics Engineering and Control Beijing Institute of Technology Beijing China Beijing Institute of Technology Beijing Beijing CN

This paper presents a novel bi-stable and integrated single use MEMS blowout switch based on electro-thermal theory. The switch mechanically breaks a metallic line. Switching between the two stable states is accomplished by a DC signal through an integrated heating resistance underneath the electrical lines to be melted. Some key features are that switches are bi-stable, integratable and IC compatible. They are compatible with various voltages operation for different applications, operation in ambient environment may be possible; predicted lifetime is very long and therefore both switches can be used for long life systems. Batch fabrication using planar processing methods is used. The ETBS could be manufacture easily in great amount. The switch can also be applied in some areas of high-energy control such as initiation security and self-control in failure.

关键词： Heating Metals Sputtering Substrates Lithography Micromechanical devices Switches

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A fuzzy self-tuning PID control system of adjustable speed diesel generator

A fuzzy self-tuning PID control system of adjustable speed d...

引用

International Conference on Systems and Informatics (ICSAI)

作者： Yufeng Zhang Shengjin Li Gang Lu Yong Zhou School of Mechatronics Northwestern Polytechnical University Xi'an China Department of Electrical and Control Engineering Xi'an University of Science and Technology Xi'an China

In order to improve the quality of power supplied by medium and small-sized diesel generator which was applied an islanded load, a digital electronic speed control system was designed in this paper. For adapting the broad load characteristics, the structure of Variable-Speed-Integrated-Generator (VSIG) was adopted by the diesel generating set. The proposed governor used a fuzzy self-tuning proportion-integral-derivative structure controller that can provide variable gain strategies to account for nonlinearities in the system. The results of test were obtained by a 3kW naturally aspirated diesel generator which was applied islanded load. The test results showed that the system designed had integrated functions of speed regulating and good speed characteristics.

关键词： Generators Tuning Velocity control Diesel engines Fuels Torque Fuzzy control

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Applicability comparison of three algorithms for electromechanical mode identification

Applicability comparison of three algorithms for electromech...

引用

IEEE Power and Energy Society General Meeting

作者： Chao Wu Junbo Zhang the College of Mechatronics and Control Engineering Shenzhen University Shenzhen P.R. China the Department of Electrical Engineering Tsinghua University Beijing P.R. China

ISBN: (纸本)9781467327275

Prony method, the autoregressive moving average (ARMA) method and the stochastic subspace method are three typical signal processing approaches for identifying the electromechanical mode properties in power grids. Based on the review of their elementary principles, the applicability of the three algorithms to different kinds of signals is comparatively assessed from the perspective of near real-time oscillation characteristic estimation. Their performances are evaluated using synthetic ringdown data and ambient data obtained from a 36-node benchmark system. Moreover, the methods are employed to process ambient signals with different SNR levels in order to systematically analyze their application in practical power systems. Some general conclusions are drawn from the analysis for several simulation cases.

关键词： electromechanical dynamic modal estimation applicability Prony method ARMA method stochastic subspace method Power grids signals power systems ring-down autoregressive moving average Perspective quasi-realtime language PRONY METHOD algorithms

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A Power Spectrum Density Based Signal Selection Approach for Electromechanical Mode Estimation

A Power Spectrum Density Based Signal Selection Approach for...

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IEEE Power and Energy Society General Meeting

作者： Junbo Zhang Chao Wu Yingduo Han Department of Electrical Engineering Tsinghua University Beijing P.R. China Department of Mechatronics and Control Engineering Shenzhen University Shenzhen P.R. China

ISBN: (纸本)9781467327275

An effective identification method and an informative signal are two inseparable aspects for precise estimation of power systems' electromechanical modes. Informative signal is conventionally selected by power spectrum density (PSD) analysis from numerous amounts of ambient data. However, directly comparing PSD plots of different signals is casual and imprecise, especially for those non-obvious modes which could be overlooked in the PSD plots. In this paper, a signal selection approach based on PSD analysis is proposed to accurately evaluate whether a signal is informative to a mode. Simulation is carried out in an 8-generator 36-node benchmark system;mode estimation is employed to validate its effectiveness.

关键词： electromechanical mode estimation signal selection informative ambient signal power density spectrum (PSD) online monitoring Power spectral density PSD gene PREVENTION OF SIGNIFICANT DETERIORATION Signal selection power systems signals

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Training fuzzy neural networks using sliding mode theory with adaptive learning rate

Training fuzzy neural networks using sliding mode theory wit...

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International Conference on System Science, engineering Design and Manufacturing Informatization (ICSEM)

作者： Alireza Zarif Khoramdel Azad Mojtaba Ahmadieh Khanesar Mohammad Teshnehlab Department of Mechatronics Engineering Islamic Azad University Tehran Iran Department of Control and Electrical Engineering Electrical and Computer Engineering Faculty Semnan University Semnan Iran Control Department Electrical and Computer Engineering Faculty K.N. Toosi University of Technology Tehran Iran

This paper proposes an online training method for the parameters of a fuzzy neural network (FNN) using sliding mode systems theory with an adaptive learning rate. The implemented control structure consists of a conventional controller in parallel with a FNN. The former is provided both to guarantee global asymptotic stability in compact space and acts as a sliding surface to guide the states of the system towards zero. The output of the conventional controller is used to update the parameters of the FNN. The output of the FNN gradually replaces the conventional controller. The adaptive learning rate makes it possible to control the system without priori knowledge about the upper bound of the states of the system and their derivatives. An appropriate Lyapunov function approach is used to analyze the stability of the adaptation law of parameters of FNN. Sufficient conditions to guarantee the boundedness of the parameters are derived. The proposed approach is tested on the velocity control of an electro hydraulic servo system in presence of flow nonlinearities and internal friction.

关键词： Fuzzy control Fuzzy neural networks PD control Training Asymptotic stability Adaptive systems

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Homographic tracking algorithm of moving objects for multiple video surveillance system (ICCAS 2012)

Homographic tracking algorithm of moving objects for multipl...

引用

International Conference on control, Automation and Systems ( ICCAS)

作者： Kyung-Taek Hong Jae-Hong Shim Byoung-Doo Kang Il-Kyun Jung Department of Robot Intelligence Control Korea Polytechnic University Siheung South Korea Department of Mechatronics Engineering Korea Polytechnic University Siheung South Korea Department of Mechatronics Korea Electronics Technology Institute Bucheon South Korea

When a video surveillance system tracks a specific object, it is very important to get quickly the information of the object through fast image processing. Usually one camera surveillance system for tracking the object made results in various problems such like occlusion, image noise during the tracking process. It makes difficulties on image based moving object tracking. Therefore, to overcome the difficulties the multi video surveillance system which installed several camera within interested area and looking the same object from multi angles of view could be considered as a solution. If multi cameras are used for tracking object, it is capable of making a decision having high accuracy in more wide space. This paper proposes a method of recognizing and tracking a specific object like a car using the homography in which multi cameras are installed at the crossroad.

关键词： Cameras Equations Video surveillance Mathematical model Object recognition Electronic mail

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Timing scheme of floating-point based digital controller for DC-DC Converters

Timing scheme of floating-point based digital controller for...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Chao Wang Dong-lai Zhang Tie-cai Li Department of Power Electronic and Motion Control Shenzhen Academy of AeroSpace Technology Shenzhen China Department of Mechatronics Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9781467301596

This paper mainly proposes a timing scheme of a digitally controlled DC-DC converter, which is described in hardware description language (HDL) at the functional level. FPGA is adopted for the optimization of computation, sampling and modulation to get precise and fast dynamic response of DC-DC converters. The concept of this timing scheme is broad and includes DPWM scheme, sampling scheme and computation scheme. Computational accuracy of the scheme is guaranteed by floating-point arithmetic. At the same time, fast integer-float and float-integer converters are developed based on look-up tables and real-time computation which can greatly reduce the duty pulse width computation clock cycles. A specific sampling and PWM scheme are designed to eliminate compensator delay caused by sampling and hold and the computation process. High precision digital pulse-width modulator based on second-order sigma-delta concept (Σ-ΔDPWM) and dual-mode compensator method are implemented to eliminate steady Limit-Cycle and to maintain fast dynamic response as well. This design is made for IC design verification to practically used digital DC-DC converters.

关键词： Clocks Delay Pulse width modulation Limit-cycles Field programmable gate arrays Transient response

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Model based control of series elastic actuators

Model based control of series elastic actuators

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Markus Grün Roman Müller Ulrich Konigorski Department of Control Engineering and Mechatronics Technische Universität Darmstadt Darmstadt Germany Institute of Electromechanical Design Technische Universität Darmstadt Darmstadt Germany

This contribution presents a comprehensible model based approach of a control structure to control the output force of series elastic actuators. The controller is based on a linear model of the actuator, which can be reduced to a PT 2 element if a disturbance compensator is included. This allows for a straightforward design of a state space controller and an intuitive choice of the controller parameters. An actuator design is presented and the required system parameters are identified. The performance of the control structure is proven by experiment.

关键词： Torque Actuators Gears Force Springs DC motors Sea measurements

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Closed-loop stability and performance optimization in LPV control based on a reduced parameter set

Closed-loop stability and performance optimization in LPV co...

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IEEE Conference on Decision and control

作者： C. Hoffmann S. M. Hashemi H. S. Abbas H. Werner Institute of Control Systems Hamburg University of Technology Hamburg Germany Mechatronics and Robotics Engineering Department Egypt-Japan University of Science and Technology Alexandria Egypt

ISBN: (纸本)9781467320658

A difficulty encountered in applying linear parameter-varying (LPV) control is the complexity of synthesis and implementation for large numbers of scheduling parameters. Often, heuristic solutions involve neglecting individual scheduling parameters, such that LPV controller synthesis methods become applicable. However, stability and performance guarantees are rendered void, if a controller design based on an approximate model is implemented on the original plant. In this paper, a posteriori conditions are proposed to assess closed-loop stability and performance and possibly recover guarantees. The controller - synthesized based on a reduced parameter set - is first transformed back to depend on the original parameters. Then analysis is performed with respect to the original plant model, which is considered to be accurate. Moreover, an iterative approach for optimizing controllers with few scheduling parameters is sketched. A two-degrees-of-freedom (2-DOF) robotic manipulator is considered as an illustrative example. Experimental results indicate a significant increase in performance.

关键词： Stability analysis Vectors Optimization Robots Linear matrix inequalities Scheduling Approximation methods

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