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ANN-based soft-sensor for real-time process monitoring and control of an industrial polymerization process

COMPUTERS & CHEMICAL ENGINEERING 2009年第1期33卷 43-49页

作者： Gonzaga, J. C. B. Meleiro, L. A. C. Kiang, C. Maciel Filho, R. Univ Fed Rural Rio de Janeiro Dept Tecnol Alimentos Seropedica RJ Brazil M&G Fibras & Resinas Sao Paulo Brazil Univ Estadual Campinas Fac Engn Quim Campinas SP Brazil

This paper presents the development and the industrial implementation of a virtual sensor (soft-sensor) in the polyethylene terephthalate (PET) production process. This soft-sensor, based on a feed-forward artificial neural network (ANN), was primarily used to provide on-line estimates of the PET viscosity, which is necessary for process control purposes. The ANN-based soft-sensor (ANN-SS) was also used for providing redundant measurements of the viscosity that could be compared to the results obtained from the process viscometer. It was shown that the proposed ANN-SS was able to adequately infer the polymer viscosity, in such a way so as this soft-sensor could be used in the real-time process control strategy. The proposed control system has Successfully been applied in servo and regulatory problems, thus allowing an effective and feasible operation of the industrial plant. (C) 2008 Elsevier Ltd. All rights reserved.

关键词： soft-sensor Artificial neural networks Polymerization process Polyethylene terephthalate Process control distributed control system

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A Novel Fault-Tolerant Scheduling Algorithm for Periodic Tasks of distributed control systems

A Novel Fault-Tolerant Scheduling Algorithm for Periodic Tas...

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2009年中国控制与决策会议(2009 Chinese control and Decision Conference)

作者： Liu Huai Ji Tongzhou Huang Jianxin Lin Qiushi School of Electrical & Automatic Engineering Nanjing Normal University Nanjing 210042 Department of Automatic Control & Mechanic Engineering Kunming University Kunming 650118

For periodic real-time task in distributed control system, a novel fault-tolerant scheduling algorithm is presented based on duplication technique. The algorithm fuses active backup-copy technique and passive backup-copy technique and overlapping backup-copy technique in order to adapt task demand in different case. The method for judging the schedulability of task set is given. The heuristic task assigning algorithm based on first-fit method and minimizing “worst case completion time” is given. Finally, simulation experiments are carried out to prove the feasibility and effectiveness of the algorithm.

关键词： distributed control system Fault-tolerant Scheduling Algorithm Primary/Backup Copy Worst Case Response Rime

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An Event/Action Based Sensor Network Protocol for Real-time distributed control

An Event/Action Based Sensor Network Protocol for Real-time ...

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5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Zhao Wenmin Xing Jianguo Ju Chunhua Zhejiang Gongshang Univ Coll Comp & Informat Engn Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781424436927

The most obvious benefit from networked sensors in distributed control system is the reduction of cables, which means savings in cost and easiness in deployment and maintenance. Some current available sensor standards and protocols are complicate and cost for most industrial applications and low performance for real-time control systems. In this paper we propose a light-weight CAN-like sensor network protocol for real-time distributed control system with some unique features. Based on a novel event/action model, the protocol provides a resilient and scalable application layer that is independent with sensor developers and sensor users. The data link layer supports both event and master/slave communication mode, which greatly improves the real-time performance. An FPGA-based reference implementation of protocol stack is also validated on a Cyclone II development boards.

关键词： Sensor Network protocol distributed control system Event/action model

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Migration of a PLC controller to an IEC 61499 compliant distributed control system: Hands-on experiences

Migration of a PLC controller to an IEC 61499 compliant dist...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Hussain, T Frey, G Univ Kaiserslautern Juniorprof Agentbased Automat D-67653 Kaiserslautern Germany

ISBN: (纸本)078038914X

IEC 61499 ushers in a new trend of software development in the area of Industrial Process Measurement and control system (IPMCS). This new standard simplifies the development of distributed IPMCS applications through inclusion of re-usability, encapsulation and modularity. IEC 61499, due to its close resemblance with Object-Oriented (OO) paradigm also paves the way to integrate modeling techniques like UML into the development process of the distributed IPMCS applications. Yet a remarkable challenge is there to integrate or re-design the systems, elements or components designed using a monolithic language like the ones on Programmable Logic controllers (PLCs). In this work it is attempted to share the experiences faced while attempting to migrate a PLC controlled centralized laboratory application into an IEC 61499 compliant distributed control application. The targeted distributed control system consists of network-enabled controllers where the IEC 61499 compliant control sub-applications should run. It needs to be mentioned that the development process did not start from analysis of the specification of the instrument to be controlled but rather from a formal specification of it written in Signal Interpreted Petri Nets (SIPN).

关键词： IEC61499 migration of PLC controller distributed control system

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Research on effectiveness about SAI control

Research on effectiveness about SAI Control

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2nd Internationl Conference on Intelligent Computation Technology and Automation

作者： Sun, Bo Chen, Gang Guo, Haifeng Shenyang Ligong Univ Fac Informat Sci & Engn Shenyang Peoples R China

ISBN: (纸本)9780769538044

the method of statistical adaptive increment control based on control-cell is on the basis of periodic projection and adaptive increment control for detecting data. Programs have been made for analyzing dynamic parameter about Statistical and adaptive increment control. Analyzing adjustable increment for probability curve of relative increase for effective configuration of extending control-cell, probability curve of relative increase for full configuration of extending control-cell, it is proved that this method can converge to a statistical optimization and can be interference-free.

关键词： effectiveness embedded system distributed control system intelligent control

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Reliability Prediction of an Ethernet Bus Interface controller in a Nuclear Power Plant Simulator

Reliability Prediction of an Ethernet Bus Interface Controll...

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IEEE International Conference on Industrial Engineering and Engineering Management (IEEM 2009)

作者： Lu, L. Dong, L. Univ Ontario Inst Technol Fac Engn & Appl Sci Fac Energy Syst & Nucl Sci Oshawa ON Canada Univ Ontario Inst Technol Fac Engn & Appl Sci Oshawa ON Canada

ISBN: (纸本)9781424448692

Obsolescence presents great challenge to Nuclear Power Plants (NPP) and plant simulators around the world. Old designs will have to be modified or replaced by new designs, in order to simplify maintenance, increase availability and meet ever-increasing operational and training requirements. control system upgrade and distributed control system (DCS) design for both old plants and new builds have become the center of interest. This paper describes a new Ethernet Bus Interface controller (eBIC) used in the Input/Output (I/O) system of a Nuclear Power Plant (NPP) simulator in Canada. The reliability of the eBIC is evaluated, and compared with the reliability of the existing Bus Interface controller (BIC). It is shown that the predicted failure rate of the new eBIC is five times lower than that of the existing system. This raises the level of confidence in the new design. The reasons for this improvement are also discussed.

关键词： Ethernet Bus Interface controller Nuclear Simulator Mean Time between Failure Nuclear Power Plant distributed control system Reliability Prediction

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Forecasting Increment control Methods in Regulated Period for the Temperature of Beer Fermentation

Forecasting Increment Control Methods in Regulated Period fo...

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9th International Conference on Hybrid Intelligent systems (HIS 2009)

作者： Tang, Jian Qu, Wanchun Shenyang Ligong Univ Inst Special Equipment Shenyang Peoples R China Shenyang Ligong Univ Sch Informat Sci & Engn Shenyang Peoples R China

ISBN: (纸本)9780769537450

Aiming at the requirements and characteristics for the temperature control of fermentation jar and according to the characteristic property of cyclic controls judging by the control terminal to the controlled object, That puts forward the forecasting an increment controls method in the fixed cycle has made the beer fermentation temperature reach 0.3 degrees C under the control of accuracy.

关键词： Embedded system distributed control system intelligent control

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distributed control of an Articulated Arm Robot Based on a Single Fieldbuss Network

Distributed Control of an Articulated Arm Robot Based on a S...

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1st International Conference on Manufacturing Engineering, Quality and Production systems

作者： Puiu, Dan Moldoveanu, Florin Vasiloni, Anton Mircea Transilvania Univ Brasov Dept Automat B Dul Eroilor 29 Brasov Romania Transilvania Univ Brasov Dept Mfg Engn Brasov Romania

ISBN: (纸本)9789604741229

Due to the quick evolution of manufacturing processes, the demand for more flexible automation systems is on the rise. To answer these requirements, distributed motion control architecture based on intelligent drives tends more and more to replace the traditional solutions. This paper presents the control of an articulated arm robot with two local intelligent servo drives connected on a CAN network to a motion controller witch receives the trajectory of the robot from a computer. The control structure is based on a single CAN network where are connected the local intelligent servo drives, the motion controller and the computer.

关键词： distributed control system articulated arm robot intelligent servo drives motion coordinator CAN network interpolated trajectory

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Simulation Environment for the Design and Test of the distributed controller for an Autonomous Underwater Vehicle

Simulation Environment for the Design and Test of the Distri...

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4th IEEE Conference on Industrial Electronics and Applications

作者： Gao Jian Zhao Ningning Yan Weisheng Xu Demin Zhang Lichuan Northwestern Polytech Univ Coll Marine Engn Xian 710072 Peoples R China

ISBN: (纸本)9781424427994

The real-time simulation environment is developed for the design and test of the distributed controller for the TESTBED autonomous underwater vehicle. The vehicle dynamics is real-timely simulated in an industrial control computer and all the motion sensors and actuators external to the distributed controller is modeled with proper interfaces, allowing complete pseudo-mission simulation and analysis in the lab environment. This environment is proved to be an effective tool that supports rapid diagnosis and correction of system faults.

关键词： autonomous underwater vehicle distributed control system real-time simulator pseudo-mission simulation testing

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Design of distributed Engine control systems for Stability Under Communication Packet Dropouts

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JOURNAL OF GUIDANCE control AND DYNAMICS 2009年第5期32卷 1544-1549页

作者： Yedavalli, Rama K. Belapurkar, Rohit K. Behbahani, Alireza Ohio State Univ Dept Aerosp Engn Columbus OH 43210 USA USAF Res Lab Wright Patterson AFB OH 45433 USA

In this paper, we address the issue of the stability of distributed engine control systems under communication constraints and, in particular, for packet dropouts. We propose a control design procedure, labeled decentralized distributed full-authority digital engine control and based on a two-level decentralized control framework. We show that the packet dropping margin, which is a measure of stability robustness under packet dropouts, is largely dependent on the closed-loop controller structure and that, in particular, a block-diagonal structure is more desirable. Thus, we design a controller in a decentralized framework to improve the packet dropping margin. The effect of different mathematical partitioning on the packet dropping margin is studied. The proposed methodology is applied to an F100 gas turbine engine model, which clearly demonstrates the usefulness of decentralization in improving the stability of distributed control under packet dropouts.

关键词： distributed control system Closed Loop system Full Authority Digital Engine control Gas Turbine Engines Digital Engine control Time Division Multiple Access Aircraft Propulsion system Fault Detection, Isolation, and Recovery Airplane Information Management system Environmental control system

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