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LS/IV parametric identification for continuous and delay chemical reactor 4

LS/IV parametric identification for continuous and delay che...

引用

4th International Conference on systems and control, ICSC 2015

作者： Mohamed, Sameh Ben Boussaid, Boumedyen Abdelkrim, Naceur Tahri, Charfeddine National School of Engineers of Gabes Electrical Engineering and Automatic Control Department University of Gabes Zrig Gabes6029 Tunisia Tunisian Chemical Group Skhira Plant Electric and Instrumentation Office Skhira Sfax3050 Tunisia

ISBN: (纸本)9781479983186

Because of the dependence of the parameters in the chemical reactor industries to the raw material used in processes, an online identification of the process parameters is necessary to adjust the process control loops. This paper deals with continuous time and delay system identification of the chemical reactor. The identification of linear and single inputsingle output (SISO) system is based on the least square (LS) method, in which the output is corrupted by a non Gaussian white noise sequence. The least square method is perhaps the most commonly used parametric identification method, but it is biased even for a white measurement noise. To remove this bias we use the instrumental variable (IV) method. Results obtained indicate that the proposed algorithm provides more accurate estimated parameters. © 2015 IEEE.

关键词： Chemical reactors

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Event-Based control and Scheduling Codesign Subject to Input and State Constraints

Event-Based Control and Scheduling Codesign Subject to Input...

引用

European control Conference

作者： Sanad Al-Areqi Daniel Gorges Steven Liu Institute of Control Systems Department of Electrical and Computer Engineering University of Kaiserslautern Department of Electrical and Computer Engineering University of Kaiserslautern

ISBN: (纸本)9781467371605

This paper addresses control and scheduling code-sign problem for multiple control loops sharing a common communication and computation medium, known also as networked embedded control system (NECS) in literature. Besides the limited communication medium, physical limitations on control inputs and/or states are considered as well. To avoid unnecessary use of the limited communication medium, each control loop is equipped with a model-based event generator requesting a network access only if a necessity exists and thus minimizing the traffic load on the network. The NECS with uncertain but interval-bounded time-varying communication and computation delays is modeled as a discrete-time switched poly-topic system. Based on the resulting model and the proposed model-based event generators, the codesign problem is then introduced and formulated as an LMI optimization problem which can be solved completely offline. The effectiveness of the codesign strategy is evaluated for networked control of an active suspension system. Noteworthy, the proposed strategy is generally applicable to discrete-time switched polytopic systems.

关键词： Generators Mathematical model Computational modeling Delays control systems Communication networks Load modeling

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Hybrid automata modeling and simulation for single-phase shunt APF

Hybrid automata modeling and simulation for single-phase shu...

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International Conference on Future Wireless Networks and Information systems, ICFWI 2011

作者： Xue-Song, Zhou Cheng-Wen, Tian You-Jie, Ma Sheng-Ming, Li Si-Jia, Liu Department of Electrical Engineering Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Nankai District Tianjin300384 China

ISBN: (纸本)9783642273254

Active power filter (APF) is a typical hybrid dynamic system. And the accuracy of its model directly affects the understanding of the movement laws and the design performance of the controller. According to hybrid automata modeling theory, partition of the state space in single-phase shunt APF movement is analyzed in this paper. Then the hybrid automaton model is established. The model can accurately reflect dynamical motion characteristics of the single-phase shunt APF. Simulation results illustrate the effectiveness and validity of the proposed mode. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Automata theory

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Modelling of a multipurpose biotechnological plant in view of automatic control. Process modelling and control properties analysis

Modelling of a multipurpose biotechnological plant in view o...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Marian Barbu George Adrian Ifrim Emil Ceanga Sergiu Caraman Department of Automatic Control and Electrical Engineering “Dunarea de Jos” University of Galati Galati Romania

This work continues the paper [1] and it deals with a multipurpose biotechnological plant which includes a photobioreactor interconnected with an anaerobic digester. In the paper linearized models of reduced order for anaerobic digester and for the entire biotechnological plant are obtained. These models of reduced order are determined from detailed models of 35 th order for anaerobic digester and of 51 th order for the entire plant using Hankel analysis. It is proposed a control structure of the plant in which the photobioreactor's control loop drives the one of anaerobic digester. The results obtained in [1] and in the present paper offer the necessary information (i.e. models and control structure configurations) to the controllers design for the control loops of the multipurpose biotechnological plant.

关键词： Mathematical model Biological system modeling Ions Hydrogen Analytical models Absorption Substrates

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Zames-Falb multipliers for absolute stability: from O'Shea's contribution to convex searches

Zames-Falb multipliers for absolute stability: from O'Shea's...

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European control Conference

作者： J. Carrasco M. C. Turner W. P. Heath Control Systems Centre School of Electrical and Electronic Engineering University of Manchester Control Systems Research Group Department of Engineering University of Leicester

ISBN: (纸本)9781467371605

Absolute stability attracted much attention in the sixties. Several stability conditions for loops with slope-restricted nonlinearities were developed. Results such as the Circle Criterion and the Popov Criterion form part of the core curriculum for students of control. Moreover, the equivalence of results obtained by different techniques, specifically Lyapunov and Popov's stability theories, led to one of the most important results in control engineering: the KYP Lemma. For Lurye systems this work culminated in the class of multipliers proposed by O'Shea in 1966 and formalised by Zames and Falb in 1968. The superiority of this class was quickly and widely accepted. Nevertheless the result was ahead of its time as graphical techniques were preferred in the absence of readily available computer optimization. Its first systematic use as a stability criterion came twenty years after the initial proposal of the class. A further twenty years have been required to develop a proper understanding of the different techniques that can be used. In this long gestation some significant knowledge has been overlooked or forgotten. Most significantly, O'Shea's contribution and insight is no longer acknowledged;his papers are barely cited despite his original parameterization of the class. This tutorial paper aims to provide a clear and comprehensive introduction to the topic from a user's viewpoint. We review the main results: the stability theory, the properties of the multipliers (including their phase properties, phase-equivalence results and the issues associated with causality), and convex searches. For clarity of exposition we restrict our attention to continuous time multipliers for single-input single-output results. Nevertheless we include several recent significant developments by the authors and others. We illustrate all these topics using an example proposed by O'Shea himself.

关键词： Asymptotic stability Stability criteria Linear systems Transfer functions Robust stability Additives

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On a Feedback control-Based Mechanism of Bidding for Cloud Spot Service

On a Feedback Control-Based Mechanism of Bidding for Cloud S...

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IEEE International Conference on Cloud Computing Technology and Science (CloudCom)

作者： Zheng Li Maria Kihl Anders Robertsson Department of Electrical and Information Technology Faculty of Engineering Lund University Lund Sweden Department of Automatic Control

As a cost-effective option for Cloud consumers, spot service has been considered to be a significant supplement for building a full-fledged market economy for the Cloud ecosystem. However, unlike the static and straightforward way of trading on-demand and reserved Cloud services, the market-driven regulations of employing spot service could be too complicated for Cloud consumers to comprehensively understand. In particular, it would be both difficult and tedious for potential consumers to determine suitable bids from time to time. To reduce the complexity in applying spot resources, we propose to use a feedback control to help make bidding decisions. Based on an arccotangent-function-type system model, our novel bidding mechanism imitates fuzzy and intuitive human activities to refine and issue new bids according to previous errors. The validation is conducted by using Amazon's historical spot price trace to perform a set of simulations and comparisons. The result shows that the feedback control-based mechanism obtains a better trade-off between bidding rationality and success rate than the other five comparable strategies. Although this mechanism is only for black-box bidding (price prediction) at this current stage, it can be conveniently and gradually upgraded to take into account external constraints in the future.

关键词： Cloud computing Adaptive control Pricing Cost accounting Mathematical model Games Stochastic processes

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Wireless Network for Mobile Robot Applications

Wireless Network for Mobile Robot Applications

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作者： Kazala, R. Taneva, A. Petrov, M. Penkov, St. Department of Industrial Electrical Engineering and Automatics Kielce University of Technology Kielce Poland Department of Control Systems Technical University of Sofia Branch Plovdiv 25 Tsanko Dustabanov Str Plovdiv4000 Bulgaria

The paper presents a concept of wireless network for data exchange between mobile robot nodes. It could be used for monitoring and control applications. Each node is equipped with sensors and communication hardware. The so called nodes can collect data from sensors and send to central one. This can be a host computer connected to a cloud network. It is known as Wireless Sensor Network (WSN). The main goal is to find a way to reduce energy consumption and computing power of robot nodes. The solution is based on choosing proper communication protocols. The article presents description of standards and networks. In the developed solution MQ Telemetry Transport (MQTT) for data exchange was used. The communication organization between networked nodes is given. As a part of system verification the messages between nodes and central system were exchanged. The advantages of presented network are also included. © 2015, IFFCA (Internaitional Fedreation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Ethernet

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Understanding the dynamics of systems through the use of virtual instrumentation

Understanding the dynamics of systems through the use of vir...

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International Conference on engineering of Modern Electric systems (EMES)

作者： Nicolae Patrascoiu Ioana Camelia Barbu Department of Control Systems Computers Electrical and Power Engineering University of Petrosani

This paper aims to highlight the possibility of interactively determining the performance of dynamic systems using virtual instrumentation which include Matlab scripts, so as through this combination it can obtain the... 详细信息

关键词： Mathematical model Computational modeling DC motors Transfer functions Numerical models MATLAB Load modeling

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Digital backpropagation in the nonlinear Fourier domain 16

Digital backpropagation in the nonlinear Fourier domain

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16th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2015

作者： Wahls, Sander Le, Son T. Prilepsk, Jaroslaw E. Poor, H. Vincent Turitsyn, Sergei K. Delft Center for Systems and Control TU Delft Delft Netherlands Aston Institute of Photonic Technologies Aston University United Kingdom Department of Electrical Engineering Princeton University United States

ISBN: (纸本)9781479919307

Nonlinear and dispersive transmission impairments in coherent fiber-optic communication systems are often compensated by reverting the nonlinear Schrödinger equation, which describes the evolution of the signal in the link, numerically. This technique is known as digital backpropagation. Typical digital backpropagation algorithms are based on split-step Fourier methods in which the signal has to be discretized in time and space. The need to discretize in both time and space however makes the real-time implementation of digital backpropagation a challenging problem. In this paper, a new fast algorithm for digital backpropagation based on nonlinear Fourier transforms is presented. Aiming at a proof of concept, the main emphasis will be put on fibers with normal dispersion in order to avoid the issue of solitonic components in the signal. However, it is demonstrated that the algorithm also works for anomalous dispersion if the signal power is low enough. Since the spatial evolution of a signal governed by the nonlinear Schrödinger equation can be reverted analytically in the nonlinear Fourier domain through simple phase-shifts, there is no need to discretize the spatial domain. The proposed algorithm requires only OpDlog2 Dq floating point operations to backpropagate a signal given by D samples, independently of the fiber's length, and is therefore highly promising for real-time implementations. The merits of this new approach are illustrated through numerical simulations. © 2015 IEEE.

关键词： Optical fibers

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Stability Analysis and PI control Synthesis under Event-Triggered Communication

Stability Analysis and PI Control Synthesis under Event-Trig...

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European control Conference

作者： Sven Reimann Duc Hai Van Sanad Al-Areqi Steven Liu Institute of Control Systems Department of Electrical and Computer Engineering University of Kaiserslautern

ISBN: (纸本)9781467371605

Although setpoint tracking problems are common in practice, they are still widely unexplored in the event-triggered control framework. Therefore, an event-triggered PI control design strategy with guaranteed performance for networked control systems is proposed in this paper. The integral state of the proposed PI controller is updated at every sampling instant. The update is done by the proposed event generator and sent with new measurements to the PI controller when necessary. Based on a discretized system model and a quadratic cost function, the event-triggered PI control design problem is introduced and formulated as an LMI optimization problem. The effectiveness of the proposed strategy is then experimentally evaluated and compared with other existing strategies in the literature for a case study.

关键词： Pi control Stability analysis Closed loop systems Cost function Symmetric matrices Mathematical model

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