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Internal inductance predictive control for Tokamaks

Internal inductance predictive control for Tokamaks

引用

Proceedings of the Biannual World Automation Congress

作者： Izaskun Garrido Jesús Antonio Romero Aitor J. Garrido Davide Lucchin Edorta Carrascal Goretti Sevillano-Berasategui Universidad del Pais Vasco Bilbao PaÃs Vasco ES CIEMAT National Fusion Laboratory Madrid Spain Automatic Control Group. Dept. Aut. Control and Systems Eng University of the Basque Country (UPV/EHU) Spain Automatic Control Group. Dept. of Thermal Engineering University of the Basque Country (UPV/EHU) Spain

control of the plasma inductance is an essential tool for the successful operation of Tokamaks in order to overcome stability issues as well as the new challenges specific to advanced scenarios operation. Thus, tokamak operation may benefit from model predictive control techniques to extend the pulse duration by reducing instabilities while guaranteeing tokamak integrity. The numerical results seem to indicate that internal inductance and current profiles can be adequately controlled which will influence the L-H transition timing, the density peaking and pedestal pressure. In this regard, the need for optimal, robust control emerges as a key factor in the development of a nuclear fusion reactor.

关键词： Inductance Tokamaks Mathematical model Coils Optimization Aerospace electronics

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Nonlinear fuzzy control of human heart rate during aerobic endurance training with respect to significant model variations

Nonlinear fuzzy control of human heart rate during aerobic e...

引用

International Conference on system Theory, control, and Computing (ICSTCC)

作者： Adrian Pătraşcu Monica Patrascu Iacob Hantiu Faculty of Physical Education and Sport Babeş-Bolyai University Cluj-Napoca Romania Automatic Control and Systems Engineering Dept. University Politehnica of Bucharest Bucharest Romania

In the field of physical activity a significant importance is held by aerobic endurance training, which is a relatively low intensity exercise that depends primarily on aerobic energy generating processes. This type of training is used for the overall endurance and fitness of the body by engaging all the major systems of the body and pushing the limits of their functions with the ultimate goal of adapting these structures to the stress of the physical effort and thus improving the performance output. However, using classic training methods, it is often impossible to ensure the necessary operating points in order to obtain the desired results. The human heart rate model with respect to the velocity of walking or running presents inherent nonlinearities that are required to be taken into account when designing computer integrated training aids. This paper implements such a tool using a fuzzy control system for human heart rate during aerobic endurance training. The controller is tested and validated using two nonlinear human-on-treadmill models, and it presents robustness to significant model variations, as well as uncertainties in the model parameters and white noise type of disturbances. The designed control system ensures desired heart rate profiles, finding its usefulness in supporting the training configuration process by specialized professionals.

关键词： Heart rate Training control systems Fuzzy logic Mathematical model Adaptation models Computational modeling

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The enterprise of future as a cyber-physical system

The enterprise of future as a cyber-physical system

引用

7th IFAC Conference on Manufacturing Modelling, Management, and control, MIM 2013

作者： Dumitrache, Ioan Caramihai, Simona Iuliana University Politehnica of Bucharest Automatic Control and System Engineering Dept. 060042 Bucharest Romania University Politehnica of Bucharest Control Engineering and Applied Informatics Dept. 060042 Bucharest Romania

ISBN: (纸本)9783902823359

The paper presents a conceptual model of the manufacturing enterprise of the future, which is centered on knowledge. It is introduced the concept of organizational wisdom, as an intelligence level that allows manufacturing enterprise to take sustainable decisions. Cyber-Physical systems concept is the most promising approach to implement the knowledge/wisdom model of the enterprise. © IFAC.

关键词： Knowledge based systems

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A sensorless vector drive using self-dynamics for interior permanent magnet machine without external signal injection

A sensorless vector drive using self-dynamics for interior p...

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Annual Conference of Industrial Electronics Society

作者： Sang-il Kim Rae-Young Kimt Dept. of Electrical and Biomedical Engineering Hanyang University Energy Electronics Control System Laboratory Seoul Republic of Korea Hanyang University Seongdong-gu Seoul KR

This paper describes a new sensorless control using self-dynamics without an external signal injection. Instead of the signal injection, it utilizes the self-dynamics of the control loop that inherently adjusts the magnitude of inverters current and voltage in the switching frequency range. Due to no existence of the external signal, the proposed method provides several advantages including reduction of audible noise and core loss, while achieving a good dynamic performance with a high current controller bandwidth. The detail operation principle and the control structure are described, various simulation and experiment results are provided in order to verify the effectiveness and feasibilities.

关键词： Voltage control Rotors DSL Switching frequency Pulse width modulation Torque Sensorless control

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Analysis of the Steady State Characteristics and Regulation Strategies of the Frequency in the Northwest Power Grid

Analysis of the Steady State Characteristics and Regulation ...

引用

International Conference on Instrumentation, Measurement, Computer, Communication and control (IMCCC)

作者： Dandan Dong Zhongwei Li Hengxu Zhang Yufeng Guo Tao Zhao Dept. of Electrical Engineering Harbin Institute of Technology Harbin China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education(Shandong University) Jinan China

ISBN: (纸本)9781479965762

Using frequency data of the Northwest Power Grid from Feb. 15th to 28th, 2013 that is measured by PMU-light units in Shandong University, the steady state characteristics of frequency are analyzed in this paper. Duration and number of low-frequency and high-frequency events are listed. Statistics of daily highest, lowest and average frequency values are given. Ensemble averaged frequency values are calculated. Characteristics of steady-state frequency in the Northwest Power Grid are summarized and influence factors of frequency are discussed. The influence of the proportion of wind power on the frequency quality is simulated. The necessity of the application of a new frequency control method called DFR (Demand as Frequency controlled Reserve) in the Northwest Power Grid is discussed.

关键词： Power grids Time-frequency analysis Frequency control Wind turbines Power system stability

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Multiple land mines localization using a wireless sensor network

Multiple land mines localization using a wireless sensor net...

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International Conference on Information Fusion

作者： Haj Chhadé Hiba Abdallah Fahed Mougharbel Imad Gning Amadou Mihaylova Lyudmila Julier Simon University of Technology of Compiègne Compiègne France Lebanese University Beyrouth Lebanon University College London Dept. of Computer Science London UK Dept. of Automatic Control and Systems Engineering Sheffield University of Sheffield UK University College London Dept. of Computer Science London UK

This paper considers the problem of localization of multiple land mines using information collected by a network of wireless sensors deployed in the area of interest. These sensors detect the concentration of explosive vapours, emanating from buried land mines, in the air and have a wireless transmission system for exchanging information with a treatment or fusion centre. One of the key contribution of this paper is to locate and estimate the emission rate of multiple land mines. Using a model for the transport of the explosive chemicals in the air, we formulate the inverse problem consisting in determining sequentially the positions and emission rates of the land mines knowing concentration measurements provided by the sensors. To solve the inverse problem, we present a first solution based on a Least Squares optimization approach and a second solution based on probabilistic Bayesian techniques using a Markov Chain Monte Carlo sampling scheme. These two approaches are tested and compared on simulated data.

关键词： Landmine detection Sensors Inverse problems Wireless sensor networks Chemicals Vectors Explosives

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ANFIS based Jacobian for a parallel manipulator mobility assistive device

ANFIS based Jacobian for a parallel manipulator mobility ass...

引用

UKACC International Conference on control (control)

作者： Ahmed Asker Omar Salah Ahmed M. R. Fath El-Bab Ahmed A. Ramadan Samy M. F. Assal Salvatore Sessa Ahmed Abo-Ismail School of Innovative Design Engineering Egypt-Japan University for Science and Technology Alexandria Egypt Mechanical Engineering Dept Assiut University Assiut Egypt Computer and Automatic Control Dept Tanta University Tanta Egypt Dept. of Production Engineering and Mechanical Design Tanta University Tanta Egypt

Nowadays parallel manipulators are used widely in bioengineering applications; this leads to many exciting expectations as well as challenges. The kinematic analysis of parallel manipulators with their differential kinematics yielding the Jacobian in a closed form is not a trivial task. In this paper a parallel manipulator based mobility assistive device called EJADII is analyzed to determine forward kinematics, inverse kinematics and closed-form Jacobian. An Adaptive Neuro-Fuzzy Inference system (ANFIS) is trained to estimate the Jacobian. This system would be useful when determination of the Jacobian in a closed-form is difficult to determine. The human motion during sit to stand captured by VICON experiment is used with two assisting scenarios to train and verify this system. Computer simulations show relatively good results of the proposed system.

关键词： Jacobian matrices Kinematics Actuators Joints Manipulators Equations Mathematical model

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CSMA over time-varying channels: Optimality, uniqueness and limited backoff rate 13

CSMA over time-varying channels: Optimality, uniqueness and ...

引用

14th ACM International Symposium on Mobile Ad Hoc Networking and Computing, MobiHoc 2013

作者： Yun, Se-Young Shin, Jinwoo Yi, Yung Dept. of Automatic Control KTH Sweden Dept. of Electrical Engineering KAIST Korea Republic of

ISBN: (纸本)9781450321938

Recent studies on MAC scheduling have shown that carrier sense multiple access (CSMA) algorithms can be throughput optimal for arbitrary wireless network topology. However, these results are highly sensitive to the underlying assumption on 'static' or 'fixed' system conditions. For example, if channel conditions are time-varying, it is unclear how each node can adjust its CSMA parameters, so-called backoff and channel holding times, using its local channel information for the desired high performance. In this paper, we study 'channel-aware' CSMA (A-CSMA) algorithms in time-varying channels, where they adjust their parameters as some function of the current channel capacity. First, we show that the achievable rate region of A-CSMA equals to the maximum rate region if and only if the function is exponential. Furthermore, given an exponential function in ACSMA, we design updating rules for their parameters, which achieve throughput optimality for an arbitrary wireless network topology. They are the first CSMA algorithms in the literature which are proved to be throughput optimal under time-varying channels. Moreover, we also consider the case when back-off rates of A-CSMA are highly restricted compared to the speed of channel variations, and characterize the throughput performance of A-CSMA in terms of the underlying wireless network topology. Our results not only guide a high-performance design on MAC scheduling under highly time-varying scenarios, but also provide new insights on the performance of CSMA algorithms in relation to their backoff rates and underlying network topologies. Copyright 2013 ACM.

关键词： Carrier sense multiple access

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Contraposition Nyquist Stability Criteria for Linear Time-Delayed systems of Retarded Type

Contraposition Nyquist Stability Criteria for Linear Time-De...

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International Conference on control, Automation, Robotics & Vision

作者： Jun Zhou Xinbiao Lu Huimin Qian Dept. of Automatic Control Engineering Hohai Univ. Nanjing 211100 China

ISBN: (纸本)9781479952007

This paper reports some Nyquist-type criteria for exponential/asymptotical stability in linear time-delayed systems of retarded type, by introducing contraposition seperators into the return difference ratio relationships in feedbacks. The Nyquist criteria present necessary and sufficient stability conditions, delays-dependent, which can be interpreted similarly and examined graphically as we do for linear time-invariant systems. The suggested Nyquist criteria involve neither open-loop characteristic roots distribution nor encirclement/orientation of Nyquist loci, which are not available even approximately and finite-dimensionally in linear time-delayed systems. The Nyquist criteria can be easily applied to open-loop linear time-delayed systems. Examples are included to illustrate the results.

关键词： Nyquist criterion Nyquist stability graphically Linear root distribution

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Teaching robotics and virtual reality in a synergistic approach

Teaching robotics and virtual reality in a synergistic appro...

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2013 7th IEEE International Conference on e-Learning in Industrial Electronics, ICELIE 2013

作者： Buiu, Catalin Buga, Andreea Coman, Andreea Monica Dept. of Automatic Control and Systems Engineering Politehnica University of Bucharest Romania

ISBN: (纸本)9781479931811

This paper presents a successful implementation of an undergraduate robotics and virtual reality course that builds upon the synergies existing between these two areas in order to introduce computers and information technology students to some fundamental concepts, through the use of simulation, experiments on real robots and design of robotic creatures in virtual environments. Course objectives, methodological aspects and the main technical solutions are presented in detail. A survey has been proposed in order to evaluate the impact of this course, and parts of it are presented and commented. © 2013 IEEE.

关键词： Virtual reality

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