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Chinese control Conference (CCC)

作者： Zhiqiang Zuo Hongchao Li Yijing Wang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University 300072 China

In this paper, the problem of finite-time control for a class of uncertain Markovian jump systems subject to disturbance and input constraint is investigated. The system to be considered is more general where only partial information of transition probabilities is known. In practical systems, the amplitude that can be made to the manipulated variables is always limited. Therefore, a control algorithm should be considered in this situation. A sufficient condition is established to ensure that the state trajectory remains in a bounded region of the state space in mean square sense over a fixed time interval. Based on it, the corresponding finite-time stochastic stabilization criterion is proposed by considering the input constraint simultaneously. Numerical examples are given to show the validity of the proposed methods.

关键词： Trajectory Power system stability Numerical stability Educational institutions Stability criteria Uncertainty Ellipsoids

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An inner-out conductance ring sensor for phase fraction measurement

An inner-out conductance ring sensor for phase fraction meas...

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Chinese control Conference (CCC)

作者： Chao Tan Xue-lian Yu Feng Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University 300072 China

Two-phase flow is a frequently encountered and widely existed flow phenomenon in industrial processes. Accurate measurement on its process parameters has always remained a challenge for both the academic and engineering world. An inner-out conductance ring sensor is proposed to measure the dispersion phase fraction in an annular flow channel. The sensing field distribution along with the sensitivity distribution has been numerically studied through simulations, two typical phase distributions of stratified flow and bubbly flow are simulated for phase concentration measurement analysis of the inner-out conductance ring sensor. A prototype of this sensor is fabricated and tested in static experiments. The experiment results demonstrate that the proposed conductance sensor outputs a voltage directly proportional to the phase fraction within the target annular channel. The deviation of experiment measurement to numerical work is analyzed.

关键词： Phase measurement Electronic mail Electric variables measurement Educational institutions Fluid flow measurement Laboratories process control

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Computer control system improvement of oil-gas-water multi-phase flow experimental facility

Computer control system improvement of oil-gas-water multi-p...

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Chinese control Conference (CCC)

作者： Hao Wu Chao Tan Feng Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin Tianjin CN

In nature world and engineering production and living, multi-phase flow plays a very important role. The research of multi-phase flow in the pipe condition is necessary and the experiment device of it is very helpful. For this reason, a PC-Based small-scale physical experimental system is build by Tianjin Key laboratory of process Measurement and control. Its control system combines configuration software and Visual Basic software, the executive system is made up of several electric control valves, and the sensors consist of pressure sensors, temperature sensors, flow rate sensors, ultrasonic liquid level sensors, and so on. There are a variety of signals like digital signals, pulse signals, current analog signals, voltage analog signals, etc. And by this experimental device, the typical flow pattern can be formed, and the basic requirements of multi-phase flow research can be met. Some built-in problems and more new function have been added. These improvements of the system make it be more convenient according to the increasing demand of the multi-phase experiments.

关键词： control systems Valves Pipelines Software Sensors Accuracy Liquids

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Critical flow sonic nozzles gas flow facility with medium-pressure and closed-loop pipelines

Critical flow sonic nozzles gas flow facility with medium-pr...

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16th International Flow Measurement Conference 2013, FLOMEKO 2013

作者： Sun, Lijun Feng, Qianqian Li, Shengjie Tang, Bing Zhang, Tao Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781629938189

The requirement of gas flow facility with high pressure is increasing. But, the experiences of development the closedloop high pressure facility are not enough. Critical flow sonic Nozzles gas flow facility with medium-pressure and Closed-Loop pipelines at Tianjin University Flow Lab was presented in the paper. The performance indexes, the flow loop, the uncertainty analysis of the facility were described. Discharge coefficient correction of nozzles at medium pressure and the flow rate stability control were shown in detail. The pressure of the facility is 0.3~1.6 MPa, the flow rate is 0.5~120 m3/h at working status, the uncertainty is better than 0.3% (k=2). Copyright© (2013) by the International Measurement Federation (IMEKO).

关键词： Flow of gases

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Sufficient and Necessary Condition of Admissibility for Fractional-order Singular System

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自动化学报 2013年第12期39卷 2160-2164页

作者： YU Yao JIAO Zhuang SUN Chang-Yin School of Automation Electrical Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Advanced Control of Iron and Steel Process Ministry of Education Beijing 100083 China Beijing Institute of Elec- tronic System Engineering Beijing 100854 China

这份报纸与顺序为部分顺序的单个系统集中于考虑条件吗？(0， 1 ) 。整齐的定义，没有推动并且考虑被给第一，然后，为部分顺序的单个系统的考虑的一个足够、必要的条件被建立。一个数字例子被包括说明建议条件。

关键词：奇异系统分数阶充要条件可容许充分必要条件

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Exponential Stabilization for Linear Systems with Actuator Saturation Via Intermittent control

Exponential Stabilization for Linear Systems with Actuator S...

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第25届中国控制与决策会议

作者： Yijing Wang Weiyan Li Wenlong Yang Zhiqiang Zuo Michael Z. Q. Chen the Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Department of Mechanical Engineering The University of Hong Kong

ISBN: (纸本)9781467355339

The exponential stabilization problem of a class of linear systems with actuator saturation is addressed in this paper. In an approach different from the previous results where the continuous controllers are used all the time, here the periodically intermittent control is proposed to ensure the exponential stability of the closed-loop systems. An exponential stability criterion is suggested using the contractive invariant ellipsoid as an estimate of the domain of attraction. In addition, the exponential convergence rate is explicitly given. The feedback controller can also be designed by regarding the feedback gain as an additional variable. A numerical example is presented to illustrate the effectiveness of our theoretical analysis.

关键词： Exponential Stability, Intermittent control, Actuator Saturation, Domain of Attraction

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Switching Tracking control for Planar Systems with Transient Performance Constraints

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Acta Automatica Sinica 2013年第6期39卷 919-925页

作者： Qing-Yu SU Xi-Ming SUN Jun ZHAO State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang 110819 China School of Control Science and Engineering Dalian University of Technology Dalian 116024 China

This paper studies the output tracking problem for a class of planar systems with some given transient performance constraints which are determined by the overshoot and the settling time. The problem of switched static output feedback tracking with output constraints (SSOFTOC) is proposed and solved for the first time. The static output feedback controllers and a so-called conic switching law are designed under which the output of the closed-loop switched system can track the step signal asymptotically without violating the transient performance constraints. Furthermore, an optimal weighted transient performance is obtained by solving a nonlinear programming problem. Finally, a numerical example and an application to aircraft turbofan engine are given to illustrate the effectiveness and the applicability of the proposed method.

关键词： Switching tracking planar systems transient performance aircraft engine

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分数阶奇异系统容许性的充分必要条件(英文)

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自动化学报 2013年第12期39卷 2160-2164页

作者：余瑶焦壮孙长银 School of Automation & Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control of Iron and Steel Process Ministry of Education Beijing Institute of Electronic System Engineering

This paper focuses on the admissibility condition for fractional-order singular system with order α∈(0, 1). The definitions of regularity, impulse-free and admissibility are given first, then a sufcient and necessary condition of admissibility for fractional-order singular system is established. A numerical example is included to illustrate the proposed condition.

关键词： Fractional-order singular systems regularity impulse-free admissibility

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A novel nonlinear adaptive data driven control strategy

A novel nonlinear adaptive data driven control strategy

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Chinese control Conference (CCC)

作者： Na Dong Ai-guo Wu Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University 92 Weijin Road 300072 China

A novel adaptive data driven control strategy is proposed for general discrete nonlinear systems. The controller is designed based on the Simultaneous Perturbation Stochastic Approximation (SPSA) method, and is constructed through use of a Function Approximator (FA), which is fixed as a neural network here. In this novel approach, the parametric estimation is designed to be adaptive, which greatly improves the control ability. The proposed control strategy is finally applied to solve nonlinear tracking problems for discrete-time nonlinear systems. The feasibility and effectiveness of the proposed adaptive data driven control strategy is well demonstrated through Simulation comparison tests.

关键词： Approximation methods Adaptive systems Nonlinear systems Neural networks Mathematical model control systems Adaptation models

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Autonomous hovering control for a quadrotor unmanned aerial vehicle

Autonomous hovering control for a quadrotor unmanned aerial ...

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Chinese control Conference (CCC)

作者： Fu Wang Bin Xian Guoping Huang Bo Zhao The Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University 300072 China

In this paper, an autopilot system for the quadrotor unmanned aerial vehicle (UAV) is developed by utilizing a digital signal processor (DSP) as the on-board micro-control unit (MCU). The hardware setup and the software are also developed for the autonomous flight control of the UAV. The main design procedure includes the controller board design, brushless DC motor driver design, sensor data processing software design, and flight control algorithm design. The control algorithm is developed based on the inner loop and outer loop control method. Proportional Derivative (PD) controllers are proposed for the attitude dynamics (inner loop) and position dynamics (outer loop) respectively. Autonomous hovering control is achieved via the control of roll angle, pitch angle, yaw angle and altitude of the UAV. Experiments results are included to demonstrate the hovering control performance.

关键词： Digital signal processing Pulse width modulation Electronic mail Unmanned aerial vehicles Educational institutions Digital signal processors Heuristic algorithms

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