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第25届中国控制与决策会议

作者： Zhiqiang Zuo Chang Liu Yijing Wang the Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University

ISBN: (纸本)9781467355339

This paper considers the quantized feedback control for Markov jump linear systems with incomplete transition probabilities where the effect of current mode observation logarithmic quantizer is counted for. A sufficient condition is proposed in the framework of linear matrix inequalities. Therefore, the coarsest quantization density can be obtained using an optimization problem with convex constraints. A numerical example illustrates the effectiveness of proposed scheme.

关键词： Markov jump systems, Networked control systems, Quantized feedback, Incomplete transition probabilities

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Feasibility Exploration On Measurement Of Dilute Gas-Solid Two-Phase Flow Based On Vibration Detection Sensor With A Probe

Feasibility Exploration On Measurement Of Dilute Gas-Solid T...

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2013 IEEE 11th International Conference on Electronic Measurement & Instruments

作者： Wang Chao Kang Xubing Xu Zhanyan Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and AutomationTianjin University

ISBN: (纸本)9781479907571

A novel sensor with a probe based on vibration detection is designed in this paper. The probe is inserted into the pipe and the vibration of the probe relates to the parameters of gas-solid two-phase flow. The experiments indicate that the characteristic frequencies of signals are only decided by the structure. While different sizes and velocity of the particle cause the differences in the amplitudes of the dominant frequency.

关键词： gas-solid two-phase flow, particle impact, vibration detection

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A Synthesis Approach to Predictive control for Networked control Systems

A Synthesis Approach to Predictive Control for Networked Con...

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第三十三届中国控制会议

作者： Yuanyuan Zou James Lam Yugang Niu Dewei Li Key Laboratory of Advanced Control and Optimization for Chemical Process Ministry of EducationEast China University of Science and Technology Department of Mechanical Engineering The University of Hong Kong Department of Automation Shanghai Jiao Tong University

ISBN: (纸本)9781479947249

This paper studies a synthesis approach to predictive control for networked control systems with data loss and quantization. An augmented Markov jump linear model with polytopic uncertainties is modeled to describe the quantization errors and possible data loss. Based on this model, a predictive control synthesis approach is developed, which involves online optimization of a infinite horizon objective and conditions to deal with system constraints. The proposed MPC algorithm guarantees closed-loop mean-square stability and constraints satisfaction.

关键词： Predictive control,Networked control Systems,Stability

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Multi-model approach to nonlinear system identification with unknown time delay

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IFAC Proceedings Volumes 2014年第3期47卷 9388-9393页

作者： Lei Chen Biao Huang Fei Liu Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Institute of Automation Jiangnan University Wuxi 214122 P.R. China Department of Chemical and Materials Engineering University of Alberta Edmonton AB T6G 2G6 Canada

This paper is concerned with identification of nonlinear systems with a noisy scheduling variable, and the measurement of the system has an unknown time delay. Auto regressive exogenous (ARX) models are selected as the local models, and multiple local models are identified along the process operating points. The dynamics of a nonlinear system are represented by associating a normalized exponential function with each of the ARX models; therein, the normalized exponential function is acted as the probability density function. The parameters of the ARX models and the exponential functions as well as the unknown time delay are estimated simultaneously under the expectation maximization (EM) algorithm using the retarded input-output data. A CSTR example is given to verify the proposed identification approach.

关键词： Nonlinear system identification Expectation maximization algorithm Multiple models Time delay

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GMR Based Eddy Current System for Defect Detection

GMR Based Eddy Current System for Defect Detection

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2013 IEEE 11th International Conference on Electronic Measurement & Instruments

作者： Wang Chao Zhi Ya Gao Peng Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University

ISBN: (纸本)9781479907571

The Giant Magneto Resistance (GMR) sensor is successfully used in eddy current testing because of its good low frequency detection characteristics and high sensitivity. In order to obtain more information about defects, this paper designed a GMR based eddy current system with Field Programmable Gate Array (FPGA) for defect detection. The system can get both the amplitude of the GMR sensor's output signal and the phase related to the exciting current at the same time. Through a series of detection experiments with defects of different widths of 6mm, 8mm and 10mm, it is found that both the amplitude and the phase can clearly reflect the magnetic field changes caused by various defects. By comparing the data curves, it is proved that the phase information matches better with the real size of the defects than the amplitude information. The conclusion is beneficial for further quantitative defect detection.

关键词： giant magneto resistance, eddy current testing, FPGA, defect.

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Intelligent Turbine Flowmeter for Viscous Oil Flow Measurement

Intelligent Turbine Flowmeter for Viscous Oil Flow Measureme...

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4th International Conference on Manufacturing Science and engineering (ICMSE 2013)

作者： Xue, Long Sun, Lijun Guo, Suna Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University 300072 Tianjin China

ISBN: (纸本)9783037856932

Turbine flowmeter is significant, but the change of viscosity has a remarkable impact on the accuracy of the turbine flowmeter. Aiming at this problem, the experiment was carried out on the viscosity variable oil flow facility. New software compensation method for viscosity was put forward with the developed intelligent turbine secondary instrument. Firstly the viscosity was compensated, viscosity was regarded as independent variable, average meter factor was regarded as dependent variable, the polynomial was fitted;then the flow rate was compensated, flow rate was regarded as independent variable, the average offset between meter factor got by viscosity compensation and experiment was regarded as dependent variable. The polynomial was fitted, the sum of results of two functions was regarded as the final meter factor. The test demonstrated: with the software compensation the accuracy of intelligent turbine flowmeter changed from 8.0% to better than 2.3%.

关键词： intelligent turbine flowmeter flow measurement viscosity effect meter factor software compensation

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Guaranteed Cost control of Uncertain Discrete-time Switched Linear Systems with Actuator Saturation

Guaranteed Cost Control of Uncertain Discrete-time Switched ...

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第25届中国控制与决策会议

作者： Xinquan Zhang Jun Zhao School of Information and Control Engineering Liaoning Shihua University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University

ISBN: (纸本)9781467355339

The problem of guaranteed cost control is investigated for a class of uncertain discrete-time switched linear systems subject to actuator saturation. The purpose is to design a state feedback control law such that the closed-loop system is asymptotically stable and the upper-bound of the cost function is minimized. Based on the switched Lyapunov function approach, some sufficient conditions for the existence of guaranteed cost controllers are obtained. Furthermore, a convex optimization problem with linear matrix inequalities (LMI) constraints is formulated to determine the minimum upper-bound of the cost function. Finally, a numerical example is given to demonstrate the effectiveness of the proposed design method.

关键词： Guaranteed cost control, Switched linear systems, Actuator saturation, switched Lyapunov function, LMI

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Robust Attitude Decentralized Tracking control for a 3-DOF Helicopter with Unknown Input Time-delay

Robust Attitude Decentralized Tracking Control for a 3-DOF H...

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第25届中国控制与决策会议

作者： Yao Yu Chang-Yin Sun School of Automation & Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control of Iron and Steel Process Ministry of Education

ISBN: (纸本)9781467355339

Robust attitude decentralized tracking control problem for a 3-DOF helicopter is investigated. The model of the 3-DOF helicopter is described as a MIMO strict-feedback form system with unknown parameters, bounded disturbances, nonlinear uncertain coupling effects and unknown input-delay. A new design method based on signal compensation technique and back-stepping strategy is proposed. Based on the signal compensation method, at each backstepping design step, a robust controller consists of a nominal controller and a robust compensator. Robust practical tracking stability condition is derived in terms of linear matrix inequalities （LMIs）. Experimental results demonstrate the effectiveness of the proposed control strategy.

关键词： Backstepping robust tracking linear decentralized controller input time-delay.

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Theoretical analysis on the effect of divergent section with laminar boundary layer of sonic nozzles

Theoretical analysis on the effect of divergent section with...

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16th International Flow Measurement Conference 2013, FLOMEKO 2013

作者： Ding, Hongbing Wang, Chao Zhao, Yakun Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781629938189

ISO toroidal-throat nozzle with a divergent section differs from the nozzle used for the theoretical research of Hall & Geropp and is highly likely to affect the flow field and discharge coefficient. In this paper, the influence of ISO-type conical divergent section on discharge coefficient was analyzed basing on inviscid transonic flow model and laminar boundary layer respectively. Two coordinate systems namely cylindrical coordinates and curvilinear coordinate were applied to research the velocity distribution of core flow and calculate displacement thickness. The results indicated the influence of conical divergent section decreases with increasing of diffuser angle and Reynolds number, while increases with divergent section length increasing. It meant that the discharge coefficient is significant influence by diffuser angle and divergent section length when the Reynolds number decreases to a certain value. The sonic nozzle which is miniaturized or applied to low Reynolds number flow should be carefully designed. Copyright© (2013) by the International Measurement Federation (IMEKO).

关键词： Reynolds number

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Effect of detected space distribution for magnetic induction measurement system 7

Effect of detected space distribution for magnetic induction...

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7th World Congress in Industrial process Tomography, WCIPT7

作者： Fu, Y. Tan, C. Li, X. Dong, F. Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin300072 China

ISBN: (纸本)9780853163237

A prototype EMT system was designed that the operation frequency varying from 500 KHz to 10MHz. The system utilizes NI PXI-5105 board to collect the high frequency signal directly, which could guarantee the detection accuracy and simplifies the complexity of hardware. Based on the prototype EMT system, the salt solution with different conductivities was used as detection object and conducts a series of relevant experiments. Discuss the effects caused by the different space distributions of the object field. It makes solid foundation for the system developing and optimization in future. © 2014 International Society for Industrial process Tomography.

关键词： Object detection

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