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A LabVIEW-Based Simulator for the Activated Sludge Process

IFAC Proceedings Volumes 2012年第2期45卷 942-947页

作者： Norhaliza Abdul Wahab Muhammad Sani Gaya Yahaya Md Sam Ulf Jeppsson Reza Katebi Control and Instrumentation Department Faculty of Electrical Engineering Universiti Teknologi MalaysiaUTM Skudai 81310 Johor Malaysia (Tel:+607-5535418) Div of Industrial Electrical Engineering and Automation (IEA) Dept of Measurement Technology and Industrial Electrical Engineering (MIE) Lund University Industrial Control Centre Dept of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

Abstract The activated sludge process is the main process in most urban wastewater treatment systems. It is considered complex in nature, and building its mathematical model in practice becomes difficult. A simple and easy way to build the simulation models for the system is needed. In this paper, a LabVIEW based simulator for the system is presented. LabVIEW offers a highly efficient, simple and flexible platform for simulation and control. Building applications in LabVIEW require less coding, and debugging is easy and fast. The proposed simulator utilizes the Benchmark Simulation Model no.1 (BSM 1) for the biochemical reactor and clarification processes. The operation of the simulator is via a graphical user interface (GUI) built in the LabVIEW environment. The simulation results can be displayed in digital and graphical forms. Simulation results obtained were compared with the results from other software simulation packages in which the COST/IWA Simulation Benchmark has been implemented. The developed simulator is very useful due to its efficiency and accuracy in simulating the wastewater process model. The simulator can serve as a training tool for plant operators/students to provide them with better knowledge and understanding of the process.

关键词： Simulator LabVIEW Activated Sludge Process Wastewater Treatment Plant Simulation Benchmark

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

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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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Adaptive control for a cable driven robot arm

Adaptive control for a cable driven robot arm

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2012 9th IEEE International Conference on Mechatronics and automation, ICMA 2012

作者： Ma, Jianjun Li, Yanan Ge, Shuzhi Sam Social Robotics Laboratory Interactive Digital Media Institute National University of Singapore Singapore 119077 Singapore Department of Automatic Control College of Mechatronics and Automation National University of Defense Technology Changsha 410073 China NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore 119613 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore Robotics Institute School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 China

ISBN: (纸本)9781467312776

The cable-driven mechanism is usually used in robotic systems for the efficient transmission of forces or torques from actuators to the end-effector. However, the control design is challenging for these systems due to the cable compliance and transmission elasticity. In this paper, adaptive control in a cascaded structure is designed for the trajectory tracking of a cable driven robot arm. The desired control input is obtained by developing an adaptation scheme, which does not require the computation of the regressor matrix. Proportional-derivative (PD) control is designed to specify the actual control input such that the trajectory tracking is achieved. Simulation results are provided to show the effectiveness of the proposed method. © 2012 IEEE.

关键词： Cables

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Modified Iterative-Learning-control-Based Ramp Metering Strategies for Freeway Traffic control With Iteration-Dependent Factors

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IEEE Transactions on Intelligent Transportation systems 2012年第2期13卷 606-618页

作者： Zhongsheng Hou Jingwen Yan Jian-Xin Xu Zhenjiang Li Advanced Control Systems Laboratory of School of Electronic and Information Engineering Beijing Jiaotong University Beijing China Department of Electrical and Computer Engineering National University of Singapore Singapore Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China

For a freeway traffic system with strict repeatable pattern, iterative learning control (ILC) has been successfully applied to local ramp metering for a macroscopic freeway environment by formulating the original ramp metering problem as an output tracking, disturbance rejection, and error compensation problem. In this paper, we address the freeway traffic ramp-metering system under a nonstrict repeatable pattern. ILC-based ramp metering and ILC add-on to ALINEA strategies are modified to deal with the presence of iteration-dependent parameters, iteration-dependent desired trajectory, and input constraints. Theoretical analysis and extensive simulations are used to verify the effectiveness of the proposed approaches.

关键词： Traffic control Trajectory Mathematical model Vehicles Equations Feedback control

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Period distribution analysis of some linear maps

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Communications in Nonlinear Science and Numerical Simulation 2012年第10期17卷 3848-3856页

作者： Fei Chen Xiaofeng Liao Kwok-wo Wong Qi Han Yang Li State Key Lab. of Power Transmission Equipment and System Security College of Computer Science Chongqing University Chongqing 400044 PR China Department of Electronic Engineering City University of Hong Kong Hong Kong PR China Department of Automatic Control and Systems Engineering The University of Sheffield UK

This paper discusses period properties of some linear maps which are employed in various applications such as image encryption, public key cryptography and watermarking. Conditions for the bijectiveness of such maps and the existence of a period are presented. Period structure is also given. Then, the recurrence equation theory is adopted to address the period distribution problem. Finally, a framework to solve the problem is proposed with a demonstration of its effectiveness and efficiency into some applications.

关键词： Linear map Period distribution Periodic orbit Dynamical system Cat map

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Sensorless Variable Speed Single-Phase Induction Motor Drive system Based on Direct Rotor Flux Orientation

Sensorless Variable Speed Single-Phase Induction Motor Drive...

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International Conference on Electrical Machines

作者： M. Caruso V. Cecconi A.O. Di Tommaso R. Rocha Department of Electrical Electronic Telecommunications and Automation Engineering University of Palermo Vialle delle Scienze Ed. 9 90128 Palermo Italia Department of Control and Automation Engineering School of Mines Federal University of Ouro Preto Campus Morro do Cruzeiro 35400-000 Ouro Preto Minas Gerais Brazil

ISBN: (纸本)9781467301435

The single-phase induction motor (SPIM) is one of the electrical machines more used in the World, and can be found in several fractional and sub-fractional horsepower applications in houses, offices, shoppings, farms, and industries. The introduction of more sophisticated applications has required the use of variable speed drives for SPIM, where the adoption of sensorless techniques is the more reasonable option for speed control due to the low cost of this electrical machine. A proposal for sensorless variable speed SPIM drive based on direct rotor field orientation techniques is presented in this paper. None transformation is used in order to eliminate the asymmetry of the stator windings of the SPIM. The rotor speed is estimated from an flux observer, which is based on two independent linear feedback control systems. The speed and flux estimatives are used in two control loop based on PID regulators, which determine the voltages to be applied to the SPIM windings by a three-legs VSI inverter. Using computer simulations, two situations are considered in order to demonstrate the satisfactory performance of the proposed sensorless speed control for SPIM drives: variations on rotor speed reference and the application of mechanical load.

关键词： Sensorless Variable Speed Drives Single-Phase Induction Motor Direct Field Orientation.

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Secondary substation power line communications for medium voltage smart grids

Secondary substation power line communications for medium vo...

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IEEE International Workshop on Applied Measurements for Power systems (AMPS)

作者： Giovanni Artale Antonio Cataliotti Valentina Cosentino Dario Di Cara Pierluca Russotto Riccardo Fiorelli Giovanni Tinè Department of Electrical Electronic and Telecommunication Engineering Chemical Technologies Automation and Mathematic Models (DIEETCAM) Università di Palermo Palermo Italy STMicroelectronics S.r.l. Agrate Italy Institute of Intelligent System for Automation (ISSIA) National Research Council Palermo Italy

In this paper a performance analysis is carried out, in order to evaluate the possibility to employ power line communication (PLC) between secondary substations of a medium voltage (MV) distribution networks in a smart grid. The study is focused on the analysis of PLC technologies and the evaluation of the influence quantities on the communication performance in the most common case of by-pass connection at MV bus-bars of secondary substations. Different quantities have been analyzed as modulation techniques, requested bandwidth and bitrate, coupling device and system attenuation versus frequency in order to find the best solution for a reliable communication system. A complete model of a real case study, the distribution network of Ustica Island, have been carried out. Simulation results are presented and discussed.

关键词： Substations Power line communications Smart grids Couplings Power cables Medium voltage Attenuation

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GPU based small target detection using IR images

GPU based small target detection using IR images

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International Bhurban Conference on Applied Sciences & Technology, IBCAST

作者： Muhammad Ahmad Javed Xu Guili Yao Jie Ning Li Syed Yaqub Shah College of Electronic and Information Engineering Nanjing Univ. of Aeronautics and Astronautics Nanjing P.R. China College of Automation Engineering Nanjing Univ. of Aeronautics and Astronautics Nanjing P.R. China College of Electronic and Information Engineering Nanjing Univ. of Aeronautics and Astronautics 210016 China Department of Computer System Engineering NWFP University of Engineering and Technology Peshawar Pakistan Dept of Computer System Engineering NWFP Univ. of Engineering and Technology Peshawar Pakistan

In this paper we present a new method for detecting moving object in infrared image sequences which contain nuisance objects and noise. The moving target detection approach is based on wavelet transform with GPU implementation. According to the features of the modulus maxima images after wavelet transform, the background clutter and noise are eliminated. The effectiveness of this new method is demonstrated by applying the resulting algorithm to infrared images containing moving targets.

关键词： Transforms Graphics processing unit

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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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Adaptive generalized predictive decoupling control for a class of MIMO nonlinear systems based on unmodeled dynamic compensation

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Kongzhi Lilun Yu Yingyong/control Theory and Applications 2012年第2期29卷 157-166页

作者： Zhang, Ya-Jun Chai, Tian-You Wang, Hong Niu, Hong The State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang Liaoning 110004 China Research Center of Automation Northeastern University Shenyang Liaoning 110004 China The Control Systems Centre School of Electrical and Electronic Engineering University of Manchester M60 1QD United Kingdom Institute of System Science Northeastern University Shenyang Liaoning 110004 China

For a class of uncertain multi-input-multi-output (MIMO) discrete-time nonlinear systems with strong coupling and unstable zero-dynamics, an adaptive generalized predictive decoupling switching control method based on unmodeled dynamic compensation is proposed. It is only required that the higher order nonlinear terms of the system to satisfy a linear growth condition, rather than the global boundedness condition widely used. The analysis of stability and convergence of the adaptive control method are performed. Moreover, in designing the nonlinear generalized predictive decoupling controller, we combine the adaptive-network-based fuzzy inference system (ANFIS) training with the "one-toone mapping" technique to adaptively estimate the unmodeled dynamics, so that the universal approximation property of ANFIS can be guaranteed. Finally, simulation results demonstrate the superiority of the proposed method and validate the theoretical analysis.

关键词： Nonlinear systems

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