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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： D. Zmarzly P. Aksamit Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Poland

In the paper measurements of streaming electrification current in the range of low velocities are presented. The measurements were conducted in spinning disk system that uses wireless rotating electrometer. Using this system it is possible to measure electrification current in the range of several picoamperes. In proposed configuration the electrometer is installed in measurement object on the disk axle. The digital output is transferred using Bluetooth radio-frequency transceiver. This solution minimizes external disturbances and allows for measurement with standard uncertainty at the level of 30 fA depending on averaging time. The uncertainty slightly depends on spinning velocity. Several dependencies of averaged electrification current on rotational speed were shown. A fresh and C 60 fullerene doped transformer oil were used as an electrification source. It was observed that the electrification current can change its sign for different C 60 concentrations. Doping mineral oil leads to charge reversal in the electric double layer. The system presented in paper extends the range of possible research in the field of electrification on low velocities and can be useful in development of streaming electrification phenomena.

关键词： Current measurement Spinning Velocity measurement Rotation measurement Axles Bluetooth Radio frequency Transceivers Measurement uncertainty Time measurement

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Improved self-adaptive genetic algorithm with varying population size

Improved self-adaptive genetic algorithm with varying popula...

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2009 5th International Conference on MEMS NANO, and Smart Systems, ICMENS 2009

作者： Li, Huang Ding, Li-Xin Du, Wei-Wei State Key Laboratory of Software Engineering Wuhan University WHU China Department of Mathematics School of Science Wuhan University of Technology WHUT Wuhan China State Key Laboratory of Software Engineering Wuhan University WHU Wuhan China North Automatic Control Technology Institute Taiyuan China

ISBN: (纸本)9780769539386

The size of the population can be critical in many application of genetic algorithm. And the probabilities of crossover and mutation have an effect on the diversity of population and the convergence of algorithm. In this paper we propose an adaptive method for crossover and mutation probabilities, which change with the varying population size. This algorithm could make great progress in searching for the global optimization. The experimental results indicate some merits of the proposed method. © 2009 IEEE.

关键词： Genetic algorithms

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Methodology of calculating electric energy losses in distribution networks for the needs of assessment of operation effectiveness of distribution companies

Methodology of calculating electric energy losses in distrib...

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International Conference on Electrical Power Quality and Utilisation (EPQU)

作者： Barbara Kaszowska Andrzej Wloczyk Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Opole Poland

Calculation of the energy losses is a very important problem for the distribution networks exploitation. The paper presents the linear model of the LV distribution network for the energy losses calculation. The comparison of calculation results for different ways of agregation of energy losses magnitudes are presented in the paper.

关键词： Energy loss Dielectric losses Batteries automatic control computer science Energy measurement Fluid flow measurement Loss measurement Tin Information resources

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Linear model of a three-phase circuit characteristics

Linear model of a three-phase circuit characteristics

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International Conference on Electrical Power Quality and Utilisation (EPQU)

作者： Wcislik Miroslaw Department of Electric Engineering Automatic Control and Computer Science Kielce University of Technology Kielce Poland

The paper deals with a general form of a mathematical model of a three-phase electric circuit characteristics. A form of the model with using dimensionless variables is discussed. In general form of the linear AC circuit, the steady-state circuit characteristics are nonlinear functions of circuit elements and signals parameters. The linearized model of the asymmetrical circuit with linear loads is derived in matrix-vector notation. The model consists of sensivity function of the circuit-phase currents versus load voltages, supply voltages, phase inductances and supply voltages frequency described analytically in form of matrices or vector. As reference the symmetric (balanced) three-phase circuit was used. An example of application of this model to the determination of the inductances of the circuit is given.

关键词： Circuits Voltage Mathematical model automatic control Steady-state Furnaces Power system modeling Symmetric matrices Frequency control system synthesis

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Attenuation of ultrasound pressure fields described via contrast source formulation

Attenuation of ultrasound pressure fields described via cont...

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2009 IEEE International Ultrasonics Symposium, IUS 2009

作者： Demi, L. Verweij, M.D. Huijssen, J. De Jong, N. Van Dongen, K.W.A. Laboratory of Acoustical Imaging and Sound Control Faculty of Applied Sciences Delft University of Technology Netherlands Laboratory of Electromagnetic Research Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Netherlands Laboratory of Experimental Echocardiography Erasmus Medical Center Rotterdam Netherlands

ISBN: (纸本)9781424443895

Experimental data reveal that attenuation is an important phenomenon in medical ultrasound. The phenomenon is of particular importance for applications based on nonlinear propagation, as the higher frequency components of the pressure field generally experience greater attenuation. Therefore a method that is capable of modeling attenuation accurately is essential. In this paper we present a method to model attenuation via a contrast source formulation. We compare the obtained results with a version of the INCS method in which the attenuation is included in the Green's function. Both results are in excellent agreement with each other. ©2009 IEEE.

关键词： Ultrasonics

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Optimization-based digital redesign of analogue controllers

Optimization-based digital redesign of analogue controllers

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： K.Yu.Polyakov E.N.Rosenwasser B.P.Lampe the Department of Automatic Control State University of Ocean Technology the Department of Computer Science and Electrical Engineering University of Rostock

A novel method is proposed for the digital redesign of analogue controllers with account for the closed-loop system performance in continuous *** method,which is based on a two-level optimization algorithm,makes it possible to place the closed-loop poles inside a specified region of the complex plane and provides for reduced-order *** effectiveness of the proposed technique is demonstrated by some well-known redesign examples.

关键词： Sampled-data systems Digital redesign Modal control Parametric design Optimization Numerical methods

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Application of dynamic clonal adjustment strategy to distillation process resource allocation optimization

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Huagong Xuebao/CIESC Journal 2009年第3期60卷 660-667页

作者： Shi, Xuhua Qi, Rongbin Qian, Feng State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Research Institute of Electric Automatic Control Ningbo University Ningbo 315211 China

Based on the clonal selection principle and idiotypic immune network theory of biological immune system, a dynamic clonal adjustment strategy (DCAS) is proposed. The strategy with the target of global optimization introduces the dynamic adjustment idea of antibody promotion and suppression and automatic adjustment of the search area and clonal scale based on the clonal selection algorithm. With the use of the adaptive multi-scale mutation operation, DCAS holds a better diversity of population, harmonizes global and local optimization searching, improves the global convergence speed, and can effectively avoid prematurity. The contrasting simulation of multi-modal function optimization experiments between DCAS and other algorithms were performed. The experiment results verify that the above theory is right and it can be used in the distillation process resource allocation optimization with good results.

关键词： Global optimization

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Robust Model Predictive control of continuous-time sampled-data nonlinear systems with Integral Sliding Mode

Robust Model Predictive Control of continuous-time sampled-d...

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European control Conference (ECC)

作者： M. Rubagotti D.M. Raimondo A. Ferrara L. Magni Dept. of Computer Engineering and Systems Science University of Pavia Pavia Italy Automatic Control Laboratory Swiss Federal Institute of Technology Zürich Switzerland

A hierarchical Nonlinear Model Predictive control (NMPC) scheme with guaranteed Input-to-State-practical-Stability (ISpS) is proposed. The controller is formed by an Integral Sliding Mode (ISM) controller and a NMPC one. The ISM, relying on the knowledge of the nominal continuous-time model of the system and of the piecewise constant control signal generated by the NMPC produces a control action aimed at reducing the difference between the dynamics of the nominal closed-loop system and the actual evolution of the state. The NMPC in this way can be designed based on a system with reduced uncertainty. In order to prove the stability of the overall control scheme, some general Regional ISpS results for continuous-time systems are proven.

关键词： Robustness Closed loop systems Uncertainty Stability analysis Economic indicators Manifolds Predictive control

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Cross-layer design of wireless networked control systems with energy limitations

Cross-layer design of wireless networked control systems wit...

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European control Conference (ECC)

作者： A. Chamaken L. Litz M. Kraemer R. Gotzhein Institute of Automatic Control Electrical Engineering and Information Technology University of Kaiserslautern Networked Systems Research Group Computer Science University of Kaiserslautern

A new approach to the cross-layer design of wireless networked control systems under limited computing and energy resources is presented. The idea is to provide a methodology that jointly takes the aspects of control e.g. control algorithms, Communication e.g. communication protocols, and Computation e.g. energy consumption into consideration. The design objective is the predictability and optimization of the control performance for a given control application. The control performance is a complex function of network parameters e.g. delay, packet loss, network throughput and control system parameters e.g. sampling period, control algorithm. control performance predictability and optimization can only be achieved by imposing requirements on the wireless network design. A cross-layer design methodology is shown to be very useful for this purpose. To illustrate the methodology, an inverted pendulum system with low-energy wireless network is used for the cross-layer design of control algorithms and communication protocols under computing and energy constraints.

关键词： Quality of service Delays Sensors Wireless sensor networks Wireless communication Protocols Packet loss

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Bilevel programming for analysis of low-complexity control of linear systems with constraints

Bilevel programming for analysis of low-complexity control o...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Henrik Manum Colin N.Jones Johan Lfberg Manfred Morari Sigurd Skogestad Department of Chemical Engineering Norwegian University of Science and Technology ETH Zrich Automatic Control Laboratory Department of Electrical Engineering Linkping University

In this paper we use bilevel programming to find the maximum difference between a reference controller and a low-complexity controller in terms of the infinitynorm difference of their control laws.A nominal MPC for linear systems with constraints,and a robust MPC for linear systems with bounded additive noise are considered as reference *** possible low-complexity controllers we discuss partial enumeration(PE),Voronoi/closest point,triangulation,linear controller with saturation,and others.A small difference in the norm between a low-complexity controller and a robust MPC may be used to guarantee closed-loop stability of the low-complexity controller and indicate that the behaviour or performance of the low-complexity controller will be similar to that of the reference *** further discuss how bilevel programming may be used for closed-loop analysis of model reduction.

关键词： bilevel programming closed-loop analysis optimal control

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