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Evaporator unit as a benchmark for Plug and Play and fault tolerant control *

IFAC Proceedings Volumes 2012年第20期45卷 701-706页

作者： Roozbeh Izadi-Zamanabadi Kasper Vinther Hamed Mojallali Henrik Rasmussen Jakob Stoustrup Danfoss A/S Nordborgvej 81 DK-6430 Nordborg Denmark Faculty of Engineering University of Guilan P.O. Box: 41635-3756 Iran Department of Electronic Systems Section of Automation and Control Aalborg University Aalborg Denmark

This paper presents a challenging industrial benchmark for implementation of control strategies under realistic working conditions. The developed control strategies should perform in a plug & play manner, i.e. adapt to varying working conditions, optimize their performance, and provide fault tolerance. A fault tolerant strategy is needed to deal with a faulty sensor measurement of the evaporation pressure. The design and algorithmic challenges in the control of an evaporator include: unknown model parameters, large parameter variations, varying loads, and external discrete phenomena such as compressor switch on/off or abrupt change in compressor speed.

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Fabrication of diamond nanopit arrays by room-temperature curing nanoimprint lithography using glass-like carbon molds

Fabrication of diamond nanopit arrays by room-temperature cu...

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2011 MRS Fall Meeting

作者： Kiyohara, Shuji Ito, Chigaya Ishikawa, Ippei Takikawa, Hirofumi Taguchi, Yoshio Sugiyama, Yoshinari Omata, Yukiko Kurashima, Yuichi Electric and Control System Engineering Course Faculty of Advanced Engineering Maizuru National College of Technology 234 Aza Shiroya Maizuru Kyoto 625-8511 Japan Department of Electrical and Electronic Information Engineering Toyohashi University of Technology Toyohashi Aichi 441-8580 Japan Application and Technical Section Elionix Inc. 3-7-6 Motoyokoyama Hachioji Tokyo 192-0063 Japan Department of Mechanical System Engineering University of Yamanashi 4-3-11 Takeda Kofu Yamanashi 400-8511 Japan

ISBN: (纸本)9781605113722

We have proposed the use of glass-like carbon (GC), as mold material because the 27-maximum etching selectivity of polysiloxane film against GC, which was approximately six times larger than that of polysiloxane film against chemical vapor deposited (CVD) diamond film. We have investigated the fabrication of diamond nanopit arrays by room-temperature curing nanoimprint lithography (RTC-NIL) using GC mold, as applications to the emitter and the micro-gear. The polysiloxane has in the state of sticky liquid at room-temperature and negative-exposure characteristic. Therefore, the polysiloxane was used as RTC-imprint resist material, and also used as electron beam (EB) resist (oxide mask) material in EB lithography. We have fabricated the cylindrical GC nanodot mold with 500 nm-diameter, 600 nm-height and 2 μm-pitch. We carried out RTC-NIL using GC mold under the following optimum conditions: time from spin-coating to imprint of 1 min, imprinting pressure of 0.5 MPa and imprinting time of 5 min. Then, we have processed the diamond film with an electron cyclotron resonance (ECR) oxygen ion shower. We have fabricated diamond nanopit array with 250 nm-depth and 500 nm-diameter. The diameter of diamond nanopit pattern was in good agreement with that of GC mold. Moreover, the depth of the diamond nanopit patterns fabricated by RTC-NIL using cylindrical GC mold was three times larger than that using conical diamond mold. © 2012 Materials Research Society.

关键词： Chemical vapor deposition

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Design and experimental evaluation of an extended data-driven PID controller

Design and experimental evaluation of an extended data-drive...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Shinichi Imai Toru Yamamoto Department of Electronic Control Engineering Hiroshima National College of Maritime Technology Osakikamijima Hiroshima Japan Div. of Electrical Systems and Mathematical Engineering Faculty of Engineering Hiroshima University Higashi Hiroshima Japan

PID control schemes have been widely used in most process control systems. However, most process systems are nonlinear, it is difficult to obtain good control performances using simple controllers with the fixed PID parameters. This paper describes a design scheme of nonlinear controllers with a local linear models structure. The linear model is designed using the data-driven(DD) approach. The DD approach is effective in describing the nonlinear components. In addition, it is easy to construct the local linear models, if the system model can be suitably designed. According to the proposed control system, the desired control performance can be obtained for nonlinear systems.

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A Robust Feasibility Problem for the Design of a Reference Governor

A Robust Feasibility Problem for the Design of a Reference G...

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American control Conference

作者： Yuping Li Bart De Schutter Department of Electrical and Electronic Engineering the University of Melbourne Parkville VIC 3010 Australia Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft the Netherlands

ISBN: (纸本)9781457710957

We formulate a robust feasibility problem for the design of a reference governor to provide setpoints for the lower-level control in a two-layer hierarchical system. Using linear programming duality, solutions to the robust feasibility problem (i.e. both necessary and sufficient conditions for the existence of an admissible reference) are given. Three cases are considered: 1) Fixed reference;2) feedforward management;and 3) affine feedback management. The computationally efficient results can be implemented in supervisory control in SCADA networks.

关键词： Robustness Trajectory Feedforward neural networks Vectors Linear programming Logic gates Delay effects

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Channel Estimation for TDS-OFDM Transmit Diversity systems over Doubly Selective Channels

Channel Estimation for TDS-OFDM Transmit Diversity Systems o...

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International Conference on Computing, Networking and Communications

作者： Lujing Geng Jintao Wang Changyong Pan Ai Bo State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Electronic Engineering Tsinghua University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University

ISBN: (纸本)9781467300087

This paper presents a channel estimation (CE) method for transmit diversity systems based on time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) scheme. Compared with conventional methods, the proposed CE method doesn't need the hypothesis that the channel responses over two consecutive signal frames or over two adjacent subcarriers are equal. Thus, it can greatly improve the system performance, especially over doubly selective fading channels. We theoretically calculate the minimum square error (MSE) lower bound and derive the design criterion for optimal training sequences. Based on these results, an optimal training sequence for multiple antenna applications is proposed. Simulation results confirm that an obvious gain in the signal-to-noise-ratio (SNR) can be obtained using the proposed method.

关键词： TDS-OFDM Transmit diversity Channel estimation Training sequence

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Design of a self-adjusting PID controller for nonlinear systems

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ICIC Express Letters 2012年第4期6卷 1091-1096页

作者： Imai, Shinichi Yamamoto, Toru Department of Electronic Control Engineering Hiroshima National College of Maritime Technology 4272-1 Higashino Osakikamijima Toyota Hiroshima Japan Division of Electrical Systems and Mathematical Engineering Faculty of Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima Japan

This paper proposes a new method of designing PID controllers for nonlinear systems. This method is characteristic in that it determines PID parameters for each of the multiple local linear models separately, allowing a more appropriate parameter tuning for the nonlinear model. Further, this method does not require time in learning or a database. Therefore, it is possible to reduce both the load and processing time related to memory and calculation costs. Finally, the effectiveness of the proposed scheme is numerically verified by a simulation example. ICIC International © 2012.

关键词： Three term control systems

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Design of a self-tuning controller using multiple local linear models for nonlinear systems

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on electronics, Information and systems 2012年第6期132卷 860-865页

作者： Imai, Shinichi Yamamoto, Toru Department of Electronic Control Engineering Hiroshima National College of Maritime Technology 4272-1 Higashino Osakikamijima Toyota Hiroshima 725-0231 Japan Division of Electrical Systems and Mathematical Engineering Faculty of Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-hiroshima Hiroshima 739-8527 Japan

Almost real-world processes are represented as nonlinear systems. Therefore, it is important to consider control schemes to cope with such systems. In this paper, a control method for nonlinear systems is newly proposed. Some local linear models on typical equilibrium points are first designed, followed by linear controllers corresponding to these models. The distances between the query and these local models are calculated, and the weights are computed in proportion to the distances. These weights are put for local controllers, and the controller corresponding to the query can be designed. According to the proposed scheme, the good control performance can be easily obtained. The effectiveness of the proposed control scheme is shown by some simulation examples. © 2012 The Institute of Electrical Engineers of Japan.

关键词： Nonlinear systems

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Optimised robust placement of hard quality sensors for robust monitoring of quality in Drinking Water Distribution systems

Optimised robust placement of hard quality sensors for robus...

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World Congress on Intelligent control and Automation (WCICA)

作者： Rafał Łangowski Mietek A. Brdys Ruiyun Qi Department of Control Systems Engineering Gdańsk University of Technology Gdansk Poland School of Electronic Electrical and Computer Engineering College of Engineering and Physical Sciences University of Birmingham Edgbaston Birmingham UK College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China

A problem of optimised robust placement of the hard quality sensors in Drinking Water Distribution systems under several water demand scenarios for robust quality monitoring is formulated. Numerical algorithms to solve the problem are derived. The optimality is meant as achieving at the same time a desired trade off between the sensor capital and maintenance costs and resulting robust estimation accuracy of the monitoring algorithm for several water demand scenarios insuring robustness with respect to the demand uncertainty. The robust estimation algorithm recently developed by the authors is applied as a soft quality in design of the sensor placement algorithms. The method and algorithm are validated by application to Chojnice DWDS case study.

关键词： Sensors Robustness Monitoring Optimization Accuracy Educational institutions Algorithm design and analysis

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Consensus control of linear multi-agent systems with distributed adaptive protocols

Consensus control of linear multi-agent systems with distrib...

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American control Conference (ACC)

作者： Zhongkui Li Xiangdong Liu Wei Ren Lihua Xie Key laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology Beijing P. R. China Department of Electrical Engineering University of California Riverside CA USA School of Electrical and Electronic Engineering Nanyang Technological University Singapore

ISBN: (纸本)9781457710957

This paper considers the distributed consensus problem of multi-agent systems with general continuous-time linear time-invariant dynamics. Based on the relative output information of neighboring agents, two distributed adaptive dynamic consensus protocols are proposed, namely, the edge-based adaptive protocol which assigns a time-varying coupling weight to each edge in the communication graph and the node-based adaptive protocol which uses a time-varying coupling weight for each node. These two adaptive protocols are designed to ensure that consensus is reached in a fully distributed fashion for any undirected connected communication graphs without using any global information. A sufficient condition for the existence of these adaptive protocols is that each agent is stabilizable and detectable. The case with switching communication graphs is also studied.

关键词： Protocols Eigenvalues and eigenfunctions Couplings Switches Linear matrix inequalities Laplace equations Lyapunov methods

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Extending CSP to detect motor imagery in a four-class BCI

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Journal of Information and Computational Science 2012年第1期9卷 143-151页

作者： Fang, Yonghui Chen, Minyou Zheng, Xufei Harrison, R.F. State Key Laboratory of Power Transmission Equipment and System Security New Technology Chongqing University Chongqing 400044 China School of Electronic and Information Engineering Southwest University Chongqing 400715 China College of Computer Science Sichuan University Chengdu 610065 China Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

Brain Computer Interface (BCI) provides a direct communication channel from brain to peripheral equipment. Common Spatial Patterns (CSP) is wildly used to extract features for electroencephalogram (EEG). However, basic CSP only suits two-class discrimination and is unable to solve multi-class discrimination problems. This paper proposes a modified CSP method termed Bisearch Common Spatial Patterns (BCSP) to solve a four-class BCI problem. In BCSP, the Fisher's Linear Discriminant Analysis (LDA) is used to discriminate among the four motor imagery tasks. The BCSP can effectively reduce the number of the basic CSP, and thus makes the overall classification procedure more efficient. The Graz BCI data set from the BCI 2008 competition be used to verify the effectiveness of the BCSP. Simulation results show that BCSP has better performance than other extension schemes. © 2012 Binary Information Press January 2012.

关键词： Brain computer interface

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