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Optimization of the multi-electrode electrostatic sensor for velocity distribution measurement

AIP Conference Proceedings 2014年第1期1592卷 43-49页

作者： Chao Wang Wenbiao Zhang Weiping Wu Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

Measuring the velocity distribution of dilute gas-solid two-phase flow is necessary for industrial process monitor and control. However, in order to get correct measurement of the velocity distribution, the effective correlation calculation by non-corresponding side electrode couples of the electrostatic sensor was needed. By introducing the principle of electrostatic correlation based velocity distribution measurement method, the importance of the effective correlation calculation by non-corresponding side electrode couples was emphasized in this paper. In order to ensure effective correlation calculation by non-corresponding side electrode couples was emphasized in this paper. In order to ensure effective correlation calculation by non-corresponding side electrode couples, effective correlation analysis of multi-electrode electrostatic sensor was carried out and effective correlation analysis method was proposed. According to this method, the structure of multi-electrode electrostatic sensor was optimized. Finally, experimental results show that correlation calculation of non-corresponding side electrode couples could be done effectively by the optimized multi-electrode electrostatic sensor. This result lays a foundation for further research on velocity distribution measurement.

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Separable model predictive control via alternating direction method of multipliers for large-scale systems 19

Separable model predictive control via alternating direction...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Lu, Liang Division of Automatic Control Department of Electrical Engineering Linköping University LinköpingSE-581 83 Sweden State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang China

ISBN: (纸本)9783902823625

In this paper, an alternating direction method of multipliers (ADMM) based realtime model predictive control (MPC) algorithm is presented. With the use of indicator function and by introducing extra consensus constraints, the constrained MPC problem can be formulated as a separable MPC problem, which can be computed very efficiently by projected gradient descent ADMM update steps and Riccati recursions. The sequence of the objective value of this constrained real-time ADMM-type MPC algorithm satisfies a linear convergence rate. The procedure is also extended to distributed systems with constraints, in which the variables of each subsystems communicate with their neighbors and update in the Gauss-Seidel way. An illustrative example shows the effectiveness of this approach. © IFAC.

关键词： Model predictive control

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Flow Velocity Measurement by Cross-correlation with Tailored Modulation

Flow Velocity Measurement by Cross-correlation with Tailored...

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IEEE International Instrumentation and Measurement Technology Conference

作者： Ziqiang Cui Huaxiang Wang Wuliang Yin Wuqiang Yang Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China School of Electrical and Electronic Engineering The University of Manchester Manchester M13 9PL UK

ISBN: (纸本)9781479961153

For measuring a flow velocity, a cross-correlation method may be used to determine the transit time between two points in a flow system. Cross-correlation is a powerful mathematical tool used in many flow meters. Since it is principally based on the time delay measurement, it imposes very few restrictions on the transducers. Various sensing techniques have been employed in flow meters involving in cross-correlation. The bandwidth of the transducers to acquire fluctuation signals is a key factor, which affects the measurement accuracy. However, most of the transducers suitable for industrial use have a limited bandwidth, performing like a low-pass spatial filter. To extend their bandwidth, the axial length of the sensing electrodes in the transducers should be as short as possible. On the other hand, the transducers need a moderately large area or length to attain an acceptable signal level. Therefore, there is a compromise in designing the electrodes for cross-correlation flow meters. In this paper, a differential capacitance transducer is proposed for the use in flow measurement by cross-correlation. In contrast to the conventional capacitance transducers, the frequency response of the differential capacitance transducer performs like a band-pass filter. As a result, it could achieve a bandwidth of 1.8 times of a conventional capacitance transducer with same axial length of electrodes. Also it offers a valuable characteristic of no standing capacitance, which enables it to take full advantage of the measuring circuit.

关键词： Cross-correlation flow velocity capacitance transducer bandwidth

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Application of Continous Casting Simulation at Štore Steel—II

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BHM Berg- und Huttenmannische Monatshefte 2014年第3期159卷 99-107页

作者： Šarler, Božidar Vertnik, Robert Lorbiecka, Agnieszka Zuzanna Vušanović, Igor Senčič, Bojan Laboratory for Multiphase Processes University of Nova Gorica Vipavska 13 Nova Gorica5000 Slovenia Laboratory for Simulation of Materials and Processes Institute of Metals and Technology Lepi pot 11 Ljubljana Slovenia Laboratory for Advanced Materials Systems Center of Excellence for Biosensors Automation and Process Control Velika pot 22 Solkan5250 Slovenia Štore Steel d.o.o. Železarska cesta 3 Štore3220 Slovenia Faculty of Mechanical Engineering University of Montenegro George Washington street Podgorica81000 Montenegro Centre of Excellence for Biosensors Automation and Process Control Velika pot 22 Solkan5250 Slovenia

This paper represents the elements and the use of the upgraded simulation system, developed in the last half decade for Štore Steel billet caster. The simulation system is used in the context of the state-of-the-art automation and information of the twenty-five year-old three-strand Concast billet continuous caster for dimensions square 140 and 180 mm with the capacity of 160,000 tons/year. The simulation system is used in the off-line and on-line modes. The off-line mode is used in order to set the proper process parameters and to calculate the temperature field, macrosegregation, and grain structure of the strand. It is also used to calculate the changes in the caster design such as the secondary cooling and the position of the SEN. The on-line model is used in automatic casting control system. The paper represents an update of our BHM publication of 2005 (Application of Continous Casting Simulation at Štore Steel, BHM, Vol. 150, No. 9, 300–306). © 2013, Springer-Verlag Wien.

关键词： Continuous casting

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Implementation of PFC (Predictive Functional control) in a petrochemical plant 19

Implementation of PFC (Predictive Functional Control) in a p...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Haber, R. Schmitz, U. Zabet, K. Institute of Process Engineering and Plant Design Laboratory of Process Automation Cologne University of Applied Science Betzdorfer Str. 2 KölnD-50679 Germany Department for APC and Process Control Technology Rheinland Refinery Shell Deutschland Oil GmbH Ludwigshafener Strasse 1 WesselingD-50389 Germany

ISBN: (纸本)9783902823625

PFC (Predictive Functional control) is a simple but very effective SISO (Single-Input SingleOutput) predictive controller which does not require any matrix inversion or numerical minimization of a cost function, therefore it is easy to realize in a PLCs (Programmable Logical controllers) or a DCS (Decentralized control Systems). The manipulated variable and/or its increment, as well other variables can be constrained easier than when using PI(D) (Proportional, Integrating, and Derivating) controller. Furthermore PFC handles the dead time process better than with PI(D) controller. Three industrial applications of PFC for two distillation columns and a reactor in a petro-chemical plant were implemented and the experiences are presented here. © IFAC.

关键词： controllers

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Analysis of the impact of translating cowl on hypersonic vehicle performance

Analysis of the impact of translating cowl on hypersonic veh...

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第26届中国控制与决策会议

作者： Liqian Dou Yuye Shen Ran Ji School of Electrical Engineering & Automation the Tianjin Key Laboratory of Process Measurement and ControlTianjin University

For the power plant of hypersonic vehicle – scramjet, this work mainly studies the effects of the translating cowl of inlet on the static and dynamic performance of the hypersonic vehicle. The results indicate that the effects of the cowl on lift and drag can be negligible, while the effects of the cowl on thrust and pitching moment are significant. The cowl makes thrust-drag ratio bigger and the accelerated conditions corresponding angle of attack range larger. The cowl increases the degree of flexible deformation, but in total this effects can be negligible. For the balance states, the elevator deflection angle needed becomes bigger to offset the additional pitching moment;a smaller angle of attack and stoichiometrically normalized fuel equivalence ratio(FER) needed generate enough thrust to reach a certain speed and height, thereby the flight left margin considering viscous is expanded. The article also analyzes the effects of a translating cowl on open-loop poles and zeros of the typical transfer function of the linear model, and found the RHP unstable zeros was away from the imaginary axis, the flight control system bandwidth limit can be slightly widened. This article provides the basis theoretical study for further controller design of the hypersonic vehicle.

关键词： translating cowl of inlet thrust-drag ratio structure flexible zero-pole point flying boundary

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Regional Stabilization of Continuous-Time Systems with Saturated Quantizer and Packet Dropouts

Regional Stabilization of Continuous-Time Systems with Satur...

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第三十三届中国控制会议

作者： Zhiqiang Zuo Dianjie Ma Yijing Wang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and AutomationTianjin University

ISBN: (纸本)9781479947249

This paper addresses the problem of regional stabilization of NCSs in continuous-time form subject to state constraints,saturated quantizer and packet dropouts. Different from the previous results based on quadratic stability, a state feedback uniform quantizer is designed via the non-quadratic Lyapunov functional approach. To achieve such an objective, the saturated quantizer is decomposed into two parts, a saturation function and a uniformly bounded disturbance. A polytopic representation of the saturation function is utilized, which builds the foundation on the construction of the non-quadratic Lyapunov functional. The designed controller is obtained through the solutions of some matrix inequalities. A numerical example is given to demonstrate the effectiveness of our results.

关键词： Regional stabilization,Saturated quantizer,Packet dropouts,Non-quadratic Lyapunov functional

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Transmission-mode ultrasonic measurement for gas bubble detection

Transmission-mode ultrasonic measurement for gas bubble dete...

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International Conference on Mechatronics and control (ICMC)

作者： Cong Xu Chao Tan Feng Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin Tianjin CN Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin P.R. China

ISBN: (纸本)9781479925391

Non-invasive ultrasonic tomography is a practical solution of extracting cross-section information regarding the process of two-phase flow. For gas/water two-phase flow, the ultrasonic energy would be reflected about 99.94% at the gas/water interface due to the great differences between the acoustic impedance of water and gas. In this paper, the relations between pressure or voltage loss and bubble diameter has been studied by simulation results and experimental results, respectively by the ultrasonic transmission method. Both results showed that the transmission-mode measurement method has good resolution on the bubble diameter.

关键词： Acoustics Ultrasonic variables measurement Tomography Attenuation Impedance Real-time systems Acoustic measurements

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Immersion and Invariance based Adaptive Attitude Tracking control of a Quadrotor UAV in the Presence of Parametric Uncertainty

Immersion and Invariance based Adaptive Attitude Tracking Co...

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第三十三届中国控制会议

作者： Bo Zhao Bin Xian Yao Zhang Xu Zhang The Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical Engineering and Automation Tianjin University

ISBN: (纸本)9781479947249

In this paper, a new adaptive controller for a quadrotor unmanned aerial vehicle(UAV) is presented via Immersion and Invariance(I&I) approach. The quadrotor's dynamic model is subjected to some uncertain parameters such as the inertial moments, aerodynamic damping coefficients and so on. In particular, the mass-eccentric effects by the payloads are also *** all these uncertainties above, the proposed adaptive controller is still capable of driving the quadrotor UAV's attitude asymptotically to a desired trajectory. The stability analysis is performed by Lyapunov techniques and LaSalle's invariance theorem. Numerical simulation results illustrate the good tracking performance of the proposed scheme.

关键词： quadrotor,UAV,adaptive control,immersion and invariance,I&I

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Corrigendum to “Limit load solutions of thick-walled cylinders with fully circumferential cracks under combined internal pressure and axial tension” [Nucl. Eng. Des. 238 (2008) 2155–2164]

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Nuclear engineering and Design 2015年 284卷 309-309页

作者： Zengliang Gao Gangsi Cai Lihua Liang Yuebao Lei Institute of Process Equipment and Control Engineering Zhejiang University of Technology The MOE Key Laboratory of Mechanical Manufacture and Automation Hangzhou 310032 China Wenzhou Industry Design Institute Wenzhou 325000 China

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