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IEEE Recent Advances in Intelligent Computational systems (RAICS)

作者： J. Arunshankar M. Umapathy Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore India Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirapalli India

In this paper, a robust loop shaping controller is designed to suppress the first two vibrating modes of a piezo actuated structure. The vibrating modes are measured by two homogeneous piezoelectric sensors. The states estimated using information filter are fused, and applied as control input. The performance of the controller is evaluated through simulation and it is found that the closed loop performance with data fusion gives improved results.

关键词： Sensor fusion Robustness Frequency response Covariance matrix Actuators Mathematical model

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A case study on timed supervisory control on a linear cluster tool using aggregated timed synthesis

A case study on timed supervisory control on a linear cluste...

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9th IEEE International Conference on control and Automation, ICCA 2011

作者： Swartjes, Lennart Su, Rong Rooda, Jacobus E. Systems Engineering Group Department of Mechanical Engineering Eindhoven University of Technology PO Box 513 5600 MB Eindhoven Netherlands Division of Control and Instrumentation School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

ISBN: (纸本)9781457714757

In this paper an approach to distributed timed supervisory based on aggregated synthesis is given. This paper formulates the distributed timed control problem and introduces a method for finding the distributed timed supervisor with the minimal makespan with reference to other supervisors synthesized with aggregated timed synthesis. The method is based on bottleneck optimization used in manufacturing lines. After introduction of the aggregated timed synthesis, the synthesis is applied to a linear cluster tool in order to compare the introduced bottleneck optimization with nonoptimized aggregated time synthesis. © 2011 IEEE.

关键词： Supervisory personnel

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Model structure selection strategy for Wiener model identification with piecewise linearisation

Model structure selection strategy for Wiener model identifi...

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Rattanasin Tanjad Sarawan Wongsa Department of Control Systems and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

This paper presents a method for identifying the optimum structure of Wiener model with pieeewise linearisation. The number of pieeewise linear functions for estimating the static nonlinear and the maximum lag of the linear dynamic part of the Wiener model are selected by cross-validation based approach. The maximum lag and the number of partitions are selected in two subsequence steps. Three popular model selection criteria, i.e. FPE, PRESS, and CP, are considered and compared in the selection process. With the ultimate aim of compensation for nonlinearities in sensors, we have illustrated the feasibility of using the proposed method to compensate hard nonlinearities, such as discontinuous nonlinear and saturation. The results from this work can be used as a guideline of model selection for Wiener model identification and nonlinear compensations of sensor.

关键词： Computers

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Novel Selenium-containing Human Single-chain Variable Fragment with Glutathione Peroxidase Activity from Computer-aided Molecular Design

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Chemical Research in Chinese Universities 2011年第5期27卷 813-819页

作者： WANG Cheng WAN Pei GONG Ping-sheng LV Li-min XU Ya-wei ZHAO Yang HE Bo ZHAO Gang YAN Gang-lin MU Ying LV Shao-wu LUO Gui-min Key Laboratory for Molecular Enzymology and Engineering Ministry of Education College of Life Science Jilin University Changchun 130012 P. R. China State Key Laboratory of Industrial Control Technology Research Center for Analytical Instrumentation Institute of Cyber-systems and Control Zhejiang University Hangzhou 310058 P. R. China Department of Biochemistry School of Basic Medical Sciences Jilin Medical College Jilin 132013 P. R. China

In order to enhance the glutathione peroxidase（GPX） catalytic activity of the selenium-containing single-chain variable fragments（Se-scFv）, a novel human scFv was designed on the basis of the structure of human antibody and optimized via bioinformatics methods such as homologous sequence analysis, three-dimensional（3D） model building, binding-site analysis and docking. The DNA sequence of the new human scFv was synthesized and cloned into the expression vector pET22b（＋）, then the scFv protein was expressed in soluble form in Escherichia coli BL21（DE3） and purified by Ni2＋-immobilized metal affinity chromatography（IMAC）. The serine residue of scFv in the active site was converted into selenocysteine（Sec） with the chemical modification method, thus, the human Se-scFv with GPX activity was obtained. The GPX activity of the Se-scFv protein was characterized. Compared with other Se-scFv, the new human Se-scFv showed similar efficiency for catalyzing the reduction of hydrogen peroxide by glutathione. It exhibited pH and temperature dependent catalytic activity and a typical ping-pong kinetic mechanism.

关键词： Glutathione peroxidase（GPX） Single-chain variable fragment（scFV） Three-dimensional model Selenium

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Wireless sensor networks for aircraft engines

Wireless sensor networks for aircraft engines

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Smart systems Integration Conference 2011, SSI 2011

作者： Jobs, Magnus Gruden, Mathias Rydberg, Anders Zenkic, Sanel Svenman, Edvard Härefors, Melker Hannius, Olof Björneklett, Are Nilsson, Peter Viketoft, Jakob Department of Engineering Sciences Angstrom Laboratory Uppsala University Uppsala Sweden Volvo Aero Corporation Applied Instrumentation Trollhättan Sweden Volvo Aero Corporation Performance and Control Systems Trollhättan Sweden ÅAC Microtec Uppsala Sweden

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Spectral analysis of block structured nonlinear systems

Spectral analysis of block structured nonlinear systems

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作者： Rijlaarsdam, David Nuij, Pieter Schoukens, Johan Steinbuch, Maarten Eindhoven University of Technology Department of Mechanical Engineering Control Systems Technology PO Box 513 WH -1.133 5600 MB Eindhoven Netherlands Vrije Universiteit Brussel Department of Fundamental Electricity and Instrumentation K430 Pleinlaan 2 1050 Brussels Belgium

ISBN: (纸本)9783902661937

It is a challenge to investigate if frequency domain methods can be used for the analysis or even synthesis of nonlinear dynamical systems. However, the effects of nonlinearities in the frequency domain are non-trivial. In this paper analytical tools and results to analyze nonlinear systems in the frequency domain are presented. First, an analytical relationship between the parameters defining the nonlinearity, the LTI dynamics and the output spectrum is derived. These results allow analytic derivation of the corresponding higher order sinusoidal input describing functions (HOSIDF). This in turn allows to develop novel identification algorithms for the HOSIDFs using identification experiments that apply broadband excitation signals, which significantly reduces the experimental burden previously associated with obtaining the HOSIDFs. Finally, two numerical examples are presented. These examples illustrate the use and efficiency of the theoretical results in the analysis of the effects of nonlinearities in the frequency domain and broadband identification of the HOSIDFs. © 2011 IFAC.

关键词： Spectrum analysis

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The effect of air gap, wheel speed and drive angle on the anti-lock braking system efficiency

The effect of air gap, wheel speed and drive angle on the an...

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International Carpathian control Conference (ICCC)

作者： Le Khac Binh Petr Koci Department of Control Systems and Instrumentation Faculty of Mechanical Engineering VSB – Technical University of Ostrava Ostrava Poruba Czech Republic

Anti-lock Braking systems (ABS) is a safe system and equipped in almost modern cars. In ABS, wheel speed sensors (WSS) are important components, they provide essential wheel speed information not only for anti-lock brake systems, but also for traction control and stability control systems. The wheel speed sensors on most vehicles are magnetic and generate an alternating current (AC) signal that increases in frequency and amplitude with wheel speed. When the teeth on the tone ring rotate past the sensor tip, it changes the magnetic field and induces a current in the sensor windings. The result is a classic sine wave current pattern that changes with wheel speed. The strength of the signal can be affected by not only wheel speed but also the air gap between the sensor and tone ring, resistance inside the sensor, resistance in the external wiring and connector. A precise gap is necessary to produce a strong, reliable signal. But if the gap is too close, metal-to-metal contact between the sensor and tone ring would damage both. Conversely, an air gap that's too wide may produce a weak or erratic signal or no signal at all. The paper presents the change of alternating current signal when changing sensor air gap, wheel speed and drive angle. By using PULSE LabShop and SignalAnalyser software, sensor KMI15, we observe the waveform on the scope. A scope will show the voltage and frequency of the signal, as well as any missing or distorted humps in the sine wave pattern. From this, we can determine the ABS brake efficiency.

关键词： Wheels Magnetic sensors Sensor systems Magnetic fields Velocity control Magnetoresistance

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Frequency Domain Based Friction Compensation - Industrial Application to Transmission Electron Microscopes

Frequency Domain Based Friction Compensation - Industrial Ap...

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2011 American control Conference (ACC)

作者： David Rijlaarsdam Pieter Nuij Johan Schoukens Maarten Steinbuch Department of Mechanical Engineering Control Systems Technology group Eindhovan University of Technology Eindhoven Netherlands Department of Fundamental Electricity and Instrumentation Vrije Universiteit Brussel Brussels Belgium

Friction is a performance limiting factor in many industrial motion systems. Correct compensation or control of friction and other nonlinearities is generally difficult. Apart from the complex nature of friction, compensation of even the most basic type of friction, Coulomb friction, is non trivial. Most available tuning methods rely on time domain data and are often unable to distinguish between nonlinear effects of friction and that of for example linear viscous damping. Furthermore, the sensitivity of time domain data to the influence of friction is too low for correct tuning in many of the high precision motion applications currently used in industry. In this paper a frequency domain method is introduced that allows fast and high accuracy tuning of controller parameters when the closed loop system is subject to nonlinear influences. This methodology is applied to optimally compensate friction in a high precision motion stage of a transmission electron microscope. Theoretical and experimental results are presented and related to time domain performance to illustrate the advantage of frequency domain tuning over time domain tuning.

关键词： Friction Feeds Harmonic analysis Frequency domain analysis Time domain analysis Tuning Gain

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Robustness preserving antiwindup: Examples and counterexamples

Robustness preserving antiwindup: Examples and counterexampl...

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IEEE International Symposium on Computer Aided control System Design (CACSD)

作者： W. P. Heath R. Morales G. Li Control Systems Centre School of Electrical and Electronic Engineering University of Manchester Manchester UK Control and Instrumentation Research Group Department of Engineering University of Leicester Leicester UK School of Engineering Computing and Mathematics University of Exeter Exeter UK

An anti-windup scheme is said to be robustness preserving if it inherits the robustness properties of the corresponding unsaturated loop. It has recently been shown in the literature that anti-windup based on internal model control preserves robustness against additive uncertainty. In this paper we illustrate examples where other anti-windup schemes are also robustness preserving. We also demonstrate by counterexample that internal model control need not preserve robustness against multiplicative uncertainty. We consider both single-input single-output and multivariable control loops.

关键词： Uncertainty Robustness Additives Educational institutions Transfer functions control systems Periodic structures

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Robustness preserving antiwindup: Examples and counterexamples

Robustness preserving antiwindup: Examples and counterexampl...

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1st Joint Symposium on Computer-Aided control System Design, CACSD 2011 and systems with Uncertainty, SU 2011

作者： Heath, W.P. Morales, R. Li, G. Control Systems Centre Sackville Street Building University of Manchester Manchester M13 9PL United Kingdom Control and Instrumentation Research Group Department of Engineering University of Leicester University Road Leicester LE1 7RH United Kingdom School of Engineering Computing and Mathematics University of Exeter North Park Road Exeter EX4 4QF United Kingdom

ISBN: (纸本)9781457710667

关键词： Robustness (control systems)

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