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Generating Li-Yorke chaos in a stable continuous-time T-S fuzzy model via time-delay feedback control

Chinese Physics B 2010年第7期19卷 141-149页

作者：孙秋野张化光赵琰 College of Information Science and Engineering Northeastern University Key Laboratory of Integrated Automation of Process Industry Ministry of EducationNortheastern University Department of Automatic Control Engineering Shenyang Institute of Engineering

This paper investigates the chaotification problem of a stable continuous-time T S fuzzy system. A simple nonlinear state time-delay feedback controller is designed by parallel distributed compensation technique. Then, the asymptotically approximate relationship between the controlled continuous-time T-S fuzzy system with time-delay and a discrete-time T-S fuzzy system is established. Based on the discrete-time T-S fuzzy system, it proves that the chaos in the discrete- time T-S fuzzy system satisfies the Li-Yorke definition by choosing appropriate controller parameters via the revised Marotto theorem. Finally, the effectiveness of the proposed chaotic anticontrol method is verified by a practical example.

关键词： chaotification T-S fuzzy model time-delay feedback Li Yorke chaos 1

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Active fault tolerant control of an electro-hydraulic servo axis with a duplex-valve-system

Active fault tolerant control of an electro-hydraulic servo ...

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5th IFAC Symposium on Mechatronic Systems, MECHATRONICS 2010

作者： Beck, Mark Schwung, Andreas Muenchhof, Marco Isermann, Rolf TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process Automation 64283 Darmstadt Germany TU Darmstadt Institute of Automatic Control Laboratory for Control Theory and Robotics 64283 Darmstadt Germany

ISBN: (纸本)9783902661760

In this paper fault detection, fault diagnosis and active fault tolerant control of an electro-hydraulic servo-axis with a duplex-valve-system are described. The fault detection is based on parity equations. The semi-physical models allow the detection of even small faults in the hydraulic system. The fault diagnosis used on the testbed is based on fuzzy-logic. In order to tolerate a failed hydraulic proportional valve, a duplex-valve-system built up with standard direct-driven proportional valves is applied. The fault management module allows the supervision of the hydraulic servo axis and decides on reconfiguration and fault accomodation of the control-loop. The Internal Model control (IMC)-tracking control structure used for reconfiguration allows bumpless transfer between controllers. Experimental results show the industrial applicability of the approach. © 2010 IFAC.

关键词： Fault detection

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Research on the two-phase flow measurement of condensate natural gas

Research on the two-phase flow measurement of condensate nat...

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15th International Flow Measurement Conference 2010, FLOMEKO 2010

作者： Xu, Ying Zhang, Qiang Zhang, Tao Li, Tao Duan, Yu-Han Li, Zhen-Lin School of Electrical and Automatic Engineering Tianjin University Key Laboratory for Process Measurement and Control TianJin 300072 China

ISBN: (纸本)9781617824722

This research is on the implementation of online non-separation flow measurement of gas-liquid two-phase condensate natural gas. The V-cone throttle device, which has the shrinkage characteristics of fluid-flux sectional area along the outside surface of its core and the inside surface of its pipe wall, and the venturi throttle device, which has the shrinkage characteristics of fluid-flux sectional area along the center of its tube, are assembled. Then the two overreading measurement models are built up according to the different characteristics of the two overreading measurement values and their inherent law respectively. Using the iterative correction method repeatedly, the flowrates of the gas-liquid two-phase can be implemented respectively. Taking a prototype with DN80 diameter designed and made for example, with the experimental devices of the wet gas flow measurement, the experimental research and the performance verification of the prototype is carried out in the flow laboratory of TianJin Univercity. The results indicate that the error limits of gas flowrate and liquid flowrate are less than ±2% and less than ±10% respectively. Meantime, a series of experimental research and performance verification are carried out in industrial fields of Southwest oil and gas fields of Petro-China. The results showed that the accumulated flow error of both the gas and the liquid is less than 1% respectively. Copyright © FLOMEKO 2010.

关键词： Flow of gases

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Wet gas flowrates metering based on double differential pressures of venturi meter

Wet gas flowrates metering based on double differential pres...

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15th International Flow Measurement Conference 2010, FLOMEKO 2010

作者： Zhang, Qiang Xu, Ying Zhang, Tao School of Electrical amd Automatic Engineering Tianjin University Key Laboratory for Process Measurement and Control 300072 Tianjin China

ISBN: (纸本)9781617824722

In order to measure the wet gas not separating, a wet gas measuring method based on double differential pressures of an alone venturi meter is presented in this study. In traditional over-reading (viz. OR) correlations, only the liquid phase fraction is known, can the OR be solved. This deficiency is analyzed by error propagation method theoretically. The change characteristics and the inherent physics laws of the differential pressures of the contraction and expansion sections of a venturi tube which were affected by the relative amount of liquid phase and gas flow rates were investigated deeply. Using a new dimensionless metering parameter, viz. the differential pressures ratio of contraction and expansion sections of venturi tube, a novel form of the OR correlation was, therefore, developed to improve the metering accuracy effectively. The gas and liquid flowrates of wet gas were solved respectively by iterations. Taking a prototype with DN80 diameter of 0.38 beta ratio designed and made for example, with the experimental devices of the wet gas flow measurement, the experimental research and the performance verification of the prototype was carried out in the flow laboratory of TianJin University. The experimental results show that the relative error of gas flow rates is less than ±2%, and the full scale error of liquid flow rates is less than ±10%, under the condition like the test pressure range from 0.1∼0.16MPa, Froude number range from 0.4∼0.7, mass ratio of liquid and gas range from 0∼1. Copyright © FLOMEKO 2010.

关键词： Gases

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Modified Pseudo-Inverse Method with Generalized Linear Quadratic Regulator for Fault Tolerant Model Matching with Prescribed Stability Degree

Modified Pseudo-Inverse Method with Generalized Linear Quadr...

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IEEE Conference on Decision and control

作者： Bogdan D. Ciubotaru Marcel Staroswiecki Nicolai D. Christov APCC Automatic Process Control and Computers Laboratory Polytechnic University of Bucharest 060042 Bucharest Romania SATIE Systemes et Applications des Technologies de l'Information et de l'Energie Laboratory Ecole Normale Superieure de Cachan 94235 Cachan Cedex France LAGIS Laboratoire d'Automatique Genie Informatique et Signal Universite des Sciences et Technologies de Lille 59655 Villeneuve d'Ascq Cedex France

ISBN: (纸本)9781612848006

When faults turn the nominal operation to an unstable post-fault regime, the accommodation procedure must recover stability and as much performance of the reference model as possible, ideally attaining perfect Model Matching (MM). In this paper, the authors develop the Modified Pseudo-Inverse Method (MPIM) with the Generalized Linear Quadratic Regulator (GLQR) stabilization using the weighting matrices derived from the Robust Optimal Model Matching (ROMM) approach and show that the MPIM-GLQR technique is the best candidate to solve the MM problem extended with the prescribed stability degree property, as opposed to the classical MPIM with simple LQR stabilization using arbitrary penalties, as was proposed in the original method. The theoretical development presented in the paper is illustrated by an aeronautical example, namely the longitudinal motion control of the B747 aircraft impaired by a structural and an actuator fault.

关键词： Model matching linear quadratic regulators reference model Fault tolerance

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Identification of the nonlinear, multivariable behavior of mechatronic combustion engines

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IFAC Proceedings Volumes 2010年第18期43卷 16-23页

作者： R. Isermann A. Schreiber Institute of Automatic Control Laboratory of Control Engineering and Process Automation TU Darmstadt Germany

The identification of the nonlinear dynamic behavior of combustion engines on test benches is described. A method, that is based on the combination of statistical stationary engine measurement (Design of Experiments - DoE) and dynamic identification techniques for nonlinear multi-input systems is shown. The dynamics are excited by several amplitude-modulated pseudorandom-binary-signals (APRBS), which act on the engine simultaneously, in order to allow a short measurement time period. To show the applicability of the described identification and modelling methods several models for a common-rail diesel engine with exhaust gas recirculation and variable geometry turbocharger (VGT) are shown, with five input variables and the outputs nitrogen-oxide emissions, opacity, air-fuel ratio (Lambda) and exhaust gas temperature.

关键词： Engine control Diesel engines Dynamic modelling Engine dynamometer Nonlinear models Parameter estimation

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Stationary Global-Local Emission Models of a CR-Diesel Engine with Adaptive Regressor Selection for Measurements of Airpath and Combustion

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IFAC Proceedings Volumes 2010年第7期43卷 246-251页

作者： Heiko Sequenz Matthias Mrosek Rolf Isermann Institute of Automatic Control Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

A model structure for stationary emission models is presented. The emissions NO x , soot and opacity are separately modeled. Model inputs are the air mass flow rate, charge air pressure, intake temperature, the location of mass fraction burned 50% and the engine operation point. Local polynomials are trained for each operation point, defined by engine speed and injection quantity. To increase accuracy a selection algorithm of the significant regressors is presented. The local models are composed by means of weighting functions, depending on the engine operation points, to global emission models. For a rasterized operation range, the weighting can be interpreted as a linear interpolation of local models. This enables an easy implementation to common electronic control units (ECUs). Measurements from a CR-Diesel engine show the quality of the models.

关键词： Automotive Emissions Local Regression Subset Selection Parametric Identification Algorithm Stationary Emission Models

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Active fault tolerant control of an electro-hydraulic servo axis with a duplex-valve-system

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IFAC Proceedings Volumes 2010年第18期43卷 660-668页

作者： Beck Mark Schwung Andreas Muenchhof Marco Isermann Rolf TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-162314) TU Darmstadt Institute of Automatic Control Laboratory for Control Theory and Robotics 64283 Darmstadt Germany (Tel: +49-6151-166283) TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-163114) TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-162114)

关键词： Fault Detection Fault Diagnosis Fault Tolerance Fault Accomodation Electro-hydraulic Servo Axis Duplex-valve-system Active Fault Tolerant control Reconfiguration Bumpless-Transfer

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Optimal control over unreliable networks with uncertain loss rates

Optimal control over unreliable networks with uncertain loss...

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作者： Kögel, Markus J. Blind, Rainer Allgöwer, Frank Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart Germany Laboratory for Systems Theory and Automatic Control Institute for Automation Engineering Otto-von-Guericke University Magdeburg Magdeburg Germany Design and Optimization in Chemical and Biochemical Process Engineering International Max Planck Research School for Analysis Magdeburg Germany

ISBN: (纸本)9781424474264

In this work, we consider an optimal control problem for Networked control Systems (NCS), where the loop is closed via an unreliable network. In order to inform the controller about the fates of the control packets, the actuator sends acknowledgements to the controller. In this work, different types of acknowledgements are considered. Since all packets are send over a network, we consequently assume, that all packets can get lost, i.e. the measurement packets, the control packets as well as the acknowledgement packets. The loss of these packets is modeled by independent and identically distributed (iid) Bernoulli processes. Finally, we assume that the parameters of these loss processes are not known exactly. Using this setup, we derive bounds for the uncertainty in the loss rates. Moreover, we present an algorithm to design a sub-optimal controller which can tolerate a given amount of network uncertainties. © 2010 AACC.

关键词： Networked control systems

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Simulation and test of backscattering from nonspherical soot particles swarm using laser

Simulation and test of backscattering from nonspherical soot...

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2010 Academic Symposium on Optoelectronics and Microelectronics Technology and 10th Chinese-Russian Symposium on Laser Physics and Laser Technology, RCSLPLT/ASOT 2010

作者： Xing, Jian Zhao, Jiaqun Liu, Yang Sun, Xiaogang College of Science Harbin Engineering University Harbin China State Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin China Harbin Institute of Technology Insititute of Automatic Detecting and Process Control System Harbin China

ISBN: (纸本)9781424455133

When the backscattering method is adopted to test the concentration and the size of soot, it's very important to analyze the backscattering characteristics of soot to determine the optimal light source, detector and detection angle. In this paper, the backscattering characteristics of nonspherical soot particles swarm are investigated. The size and shape of soot particles are determined by microscopic measurement. According to the micrograph, both Ellipsoid model and generalized Chebyshev models are selected to imitate soot particles. With the Monte-Carlo method, a random oriented particles swarm is created, and backscattering relative intensity is calculated by T-matrix method with different parameters. A simple backscattering test system was established, in which the light source and detector are selected based on the calculation results. The numerical and experimental results show that the combination of the Monte- Carlo method and the T-matrix calculation can be successfully applied to simulate the backscattering of the nonspherical particles swarm, and the experimental system has higher backscattering intensity according to simulation result. It provides a reference for improving the measurement accuracy of particles size and concentration. © 2010 IEEE.

关键词： Backscattering

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