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International Conference on Electrical Machines, ICEM

作者： Mario Vrazic Ivan Gasparac Milutin Pavlica Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation University of Zagreb Zagreb Croatia

During extensive testing of 35 MVA synchronous generator, some tests in standstill were conducted. For those tests rotor was blocked and different DC currents were driven through excitation and armature winding. In order to ensure all necessary conditions for such tests lots of preparations were made. This paper will thoroughly explain all problems that come out of such request and solutions for them.

关键词： Synchronous generators Turbines Torque Blades Rail transportation Steel Automatic testing Synchronous machines Stators Armature

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Dynamic Modelling of a Quadrotor Aerial Vehicle with Nonlinear Inputs

Dynamic Modelling of a Quadrotor Aerial Vehicle with Nonline...

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IEEE Latin American Robotics Symposium, LARS

作者： Armando S. Sanca Pablo J. Alsina Jés de Jesus F. Cerqueira Computing Engineering and Automation Department Federal University of Rio Grande do Norte Brazil Electrical Engineering Department Federal University of Bahia Salvador BA Brazil

In this paper the quadrotor dynamic model with nonlinear inputs is presented. Deadzone and saturation nonlinear inputs are considered for the quadrotor reflected to the actuators. The goal is to obtain a faithful mathematical representation of the mechanical system for system analysis and control design, not only in hover as presented in many works, but also in motion when take-off, land and flight for aerial navigation task. The model was implemented in Matlab/Simulink simulation model to optimize the design and to project control. Simulations of the model show that the nonlinear inputs must be considered in the control project.

关键词： Vehicle dynamics Vehicles Mathematical model Nonlinear dynamical systems Actuators Mechanical systems Control system analysis Control design Motion analysis Navigation

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Multiobjective fixed-order controllers for MIMO systems

Multiobjective fixed-order controllers for MIMO systems

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International Conference on Control, automation, Robotics and Vision (ICARCV)

作者： Qiongbin Lin Fuwen Yang Department of Electrical Engineering and Automation Fuzhou university Fuzhou Fujian China Department of Information Systems and Computing Brunei University Middlesex UK

This paper studies the fixed-order controllers design problem for multi-input-multi-output (MIMO) systems. Polynomial methods are employed to design a controller that guarantees all the closed-loop poles reside within given D-stability regions. An H infin optimization approach is proposed to minimize the interaction between different channels of the MIMO system. Sufficient conditions for the existence of such a fixed-controller is established by using the linear matrix inequalities (LMIs) approach.

关键词： Control systems MIMO Automatic control Polynomials Linear matrix inequalities Robotics and automation Control theory Control system synthesis Industrial control Design automation

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Walking aids for elderly people： a systematic overview

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仪器仪表学报 2008年第1期29卷 216-224页

作者： Zhou Huiyu Hu Huosheng Fei Minrui School of Engineering and Design Brunel University Uxbridge UB8 3 PH U. K. Department of Computing and Electronic Systems University of Essex Colchester CO4 3SQ U.K. School of Mechatronics Engineering and Automation Shanghai University Shanghai 20072 China

Reduction of falls of elderly people has been an active research area for many *** of older people can be signicantly reduced through the smart use of *** technologies can help older people to regain mobility and reduce their reliance on community care ***,mobility aids,as one of the main components of these assistive technologies,are mainly discussed in this *** obstacle detection systems and mobility aids will be reviewed in this paper,where different features are explicitly addressed.

关键词：障碍绕射中老年人传感器行走辅助工具跌倒伤

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IEEE Transactions on Haptics: Editorial

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IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

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Analysis of short-circuit forces at the top of the low voltage U-type and I-type winding in a power transformer

Analysis of short-circuit forces at the top of the low volta...

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International (EPE-PEMC) Power Electronics and Motion Control Conference

作者： Leonardo Strac Franjo Kelemen Damir Zarko Research and Development Department Končar Power Transformers Limited Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation University of Zagreb Zagreb Croatia

The aim of this study was to compare the short-circuit forces in the U-type and I-type low voltage winding of a large power transformer. The comparison of forces calculated using 2D Rabinpsilas method and 3D finite element method is conducted. The influence of the winding helix pitch on the winding forces calculated using 3D finite element method is also investigated.

关键词： Windings Power transformers Force Finite element methods Three dimensional displays Mathematical model Equations

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Indices for Harmonic Distortion Monitoring of Power Distribution Systems

Indices for Harmonic Distortion Monitoring of Power Distribu...

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2008 IEEE Instrumentation and Measurement Technology Conference (I2MTC 2008), vol.1

作者： Sasa Vlahinic Dalibor Brnobic Nino Stojkovic Faculty of Engineering Department of Automation Electronics and Computing Rijeka Croatia

Among different power quality parameters, the voltage total harmonic distortion is important and often-analyzed category. Different indices have already been suggested to measure and to monitor both the current and the voltage distortion in power systems, but harmonic site characterization still cannot be performed in satisfactory way. The state of the harmonic distortion is difficult to predict due to variability and a large number of unknown, such as detailed consumer and system characteristics. In this paper a new index describing the total harmonic distortion in current measurements, total rated distortion (TRD), is suggested in order to simplify and standardize harmonic current measurements. Another index representing the increase of harmonic voltage distortion with TRD, equivalent harmonic impedance z_(eq), is proposed as an efficient way of characterizing a particular site. Finally, extensive harmonic measurements of a real distribution system were performed to prove the usefulness of the proposed indices.

关键词： Harmonic distortion measurement harmonic distortion monitoring harmonic indices

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Global robust synchronization of the Duffing system and Van der Pol oscillator

Global robust synchronization of the Duffing system and Van ...

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IEEE Conference on Decision and Control

作者： Weijie Sun Daizhan Cheng Jie Huang College of Automation Science and Engineering South China University of Technology Guangzhou China Institute of Mathematics and System Science Chinese Academy and Sciences Beijing China Laboratory of Applied Control and Computing Department of Mechanical and Automation Engineering Chinese University of Hong Kong New Territories Hong Kong China

In this paper, we study the global robust synchronization problem of the controlled Duffing system and the Van der Pol oscillator. By employing the internal model approach, we first show that the problem can be converted into a global robust stabilization problem of a time-varying nonlinear system in lower triangular form. Then we show that the global stabilization problem of the lower triangular system is solvable, thus leading to the solution of the global robust synchronization problem.

关键词： Robustness Oscillators Control systems Robust control Time varying systems Nonlinear systems Partial differential equations Automatic control Sun Output feedback

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An improved access scheme based on multiple-hop priority and Cross-Layer Design in 802.11e

An improved access scheme based on multiple-hop priority and...

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The 4th International Conference on Wireless Communications, Networking and Mobile computing(第四届IEEE无线通信、网络技术及移动计算国际会议)

作者： Hua Long Joan Lu Jim Yip Hua Long Jiang Faculty of Information Engineering and Automation Kunming University of Science and Technology Kunmi School of Computing and Engineering University of Huddersfield Huddersfield UK(HD1 3DH) Department of Physics and Electronic and Engineering Nanyang Normal University Nanyang China (47306

In ad hoc networks, the end-to-end delay of packets becomes long when other middle nodes transmit these packets and the multi-hops will affect the Quality-of-Service(QoS) of voice and video. This paper analyzes influence of multi-hops in ad hoc network by a simulative experiment, which put forward an improved access algorithm, called as More Hop First-EDCF (MHF-EDCF). The mechanisms are based on 802.11e EDCF and multi-hop characteristics of Ad Hoc networks with crosslayer method. MHF-EDCF offers a higher priority to multihops packets for voice and video. The results of simulation show that MHF-EDCF can reduce the end-to-end delay of multimedia traffic significantly and throughput of network is increased.

关键词： Cross layer design Traffic control Telecommunication traffic Ad hoc networks Spread spectrum communication Quality of service Design engineering Throughput Delay Computer networks

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Finite-Dimensional H ∞ Filter Design for Linear Systems with Measurement Delay

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IFAC Proceedings Volumes 2008年第2期41卷 12365-12370页

作者： Michael Basin Peng Shi Dario Calderon-Alvarez Jianfei Wang Department of Physical and Mathematical Sciences Autonomous University of Nuevo Leon San Nicolas de los Garza Nuevo Leon Mexico Department of Computing and Mathematical Sciences Faculty of Advanced Technology University of Glamorgan Pontypridd United Kingdom College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

This paper presents the central finite-dimensional H ∞ filter for linear systems with measurement delay, that is suboptimal for a given threshold γ with respect to a modified Bolza-Meyer quadratic criterion including the attenuation control term with the opposite sign. In contrast to the results previously obtained for linear time delay systems, the paper reduces the original H ∞ filtering problem to an H 2 (optimal mean-square) filtering problem, using the technique proposed in [1]. Application of the reduction technique becomes possible, since the optimal filtering equations solving the H 2 (mean-square) filtering problems have been obtained for linear systems with measurement delay. The paper presents the central suboptimal H ∞ filter for linear systems with measurement delay, based on the optimal H 2 filter from [36], where the standard H ∞ filtering conditions of stabilizability, detectability, and noise orthonormality are assumed. Finally, to relax the standard conditions, the paper presents the generalized version of the designed H ∞ filter in the absence of the noise orthonormality. The proposed H ∞ filtering algorithm provides a direct method to calculate the minimum achievable values of the threshold γ, based on the existence properties for a bounded solution of the gain matrix equation. Numerical simulations are conducted to verify performance of the designed central suboptimal filter for linear systems with state delay against the central suboptimal H ∞ filter available for linear systems without delays. The simulation results show a definite advantage in the values of the noise-output transfer function H ∞ norms in favor of the designed filter.

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