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Application of Continous Casting Simulation at Štore Steel—II

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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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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Determination of state changes for distributed parameter systems based on quantitative POD angle analysis

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Sensors and Transducers 2014年第6期172卷 263-271页

作者： Guan, Hongwei Ye, Lingjian Song, Zhihuan Ma, Xiushui Zhi, Xiongfei Institute of Industrial Process Control Zhejiang University Hangzhou China Ningbo Institute of Technology Zhejiang University Ningbo China College of electrical engineering and automation Anhui University Hefei China

For distributed parameter systems, recognition of state change is crucial to process operation with a wide range of motivations, for example, sensitivity analysis of input condition, selection of operating point and abnormal situation diagnosis, etc. A key task therein is developing a criterion from which the extent of state change can quantitatively determinated. In this paper, a novel concept, namely the POD (proper orthogonal decomposition) angle is proposed to form such a criterion, which is developed from the POD technique. Based on this new concept, some of its theoretical properties are also described and proven along with the introduction of POD angle. As an illustrative example for the usage of POD angle, a cyclohexane process is studied where the POD angle is used to analyze the influence of feed temperature on the temperature distribution of whole system. It is demonstrated that when feed temperature is operated in the range of 100 to 120 °, the POD angle will experience a change of 17.8022°, corresponding to fluctuant amplitude of 82.0309 ° for the system temperature. Therefore, temperature distribution of system is sensitive to feed temperature in this situation. On the other hand, when feed temperature is operated in the range of 120 to 200 °, the POD angle changes only 1.1595° on average whilst the temperature distribution of whole system average varies only 5.0486 °, hence we conclude that the feed temperature imposes a minor impact on the temperature of the system as compared with the former case. © 2014 IFSA Publishing, S. L.

关键词： Temperature distribution

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A new pricing scheme for controlling energy storage devices in smart grid

A new pricing scheme for controlling energy storage devices ...

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2014 American control Conference, ACC 2014

作者： Zhu, Jingwei Chen, Michael Z. Q. Zuo, Zhiqiang Du, Baozhu Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign Champaign IL 61820 United States Department of Mechanical Engineering University of Hong Kong Hong Kong Hong Kong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China School of Automation Nanjing University of Science and Technology Nanjing China HKU Shenzhen Institute of Research and Innovation China

ISBN: (纸本)9781479932726

Improvement of the overall efficiency of energy infrastructure is one of the main anticipated benefits of the deployment of smart grid technology. Advancement in energy storage technology and two-way communication in the electric network are indispensable components to achieve such a vision, while efficient pricing schemes and appropriate storage management are also essential. In this paper, we propose a novel pricing scheme which permits one to indirectly control the energy storage devices in the grid to achieve a more desirable aggregate demand profile that meets a particular target of the grid operator such as energy generation cost minimization and carbon emission reduction. Such a pricing scheme can potentially be applied to control the behavior of energy storage devices installed for integration of intermittent renewable energy sources that have permission to grid connection and will have broader applications as an increasing number of novel and low-cost energy storage technologies emerge. © 2014 American Automatic control Council.

关键词： Smart power grids

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Hovering control of a nano quadrotor unmanned aerial vehicle using optical flow

Hovering control of a nano quadrotor unmanned aerial vehicle...

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Chinese control Conference (CCC)

作者： Bin Xian Yang Liu Xu Zhang Meihui Cao Fu Wang The Institute of Robotics and Autonomous System The Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin Tianjin CN

In this paper, a PD controller which uses optical flow to obtain position and velocity feedback is proposed for the autonomous hovering flight control of a nano quadrotor unmanned aerial vehicle (UAV). The nano quadrotor UAV has a mass less than 100 g and is comparatively much smaller than the micro vehicles utilized in previous research. Due to the limited size and payload ability, a wireless camera is employed as the onboard visual device to obtain the position and translational velocity of the UAV. Experiment results are included to demonstrate the good control performance of the proposed design.

关键词： Image motion analysis Computer vision Optical imaging Optical sensors Adaptive optics Optical filters Optical feedback

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Nonlinear Asymptotic Attitude Tracking control for an Unmanned Helicopter with Input Constraints

Nonlinear Asymptotic Attitude Tracking Control for an Unmann...

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American control Conference

作者： Xiang Liu Bin Xian Yao Zhang Xu Zhang Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and Control Schoool of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781479932757

In this paper a nonlinear attitude tracking control scheme is developed for a small-scaled unmanned helicopter under input constraints. Via the analysis of the properties associated with the helicopter's rotor dynamics, the elevator servo input, the aileron servo input, and the rudder servo input are chosen to be the control inputs to be designed. Their constraints in amplitude under hovering flight is taken into account by using the robust bounded terms in the controller design. The asymptotic convergence of the tracking error is guaranteed with the Lyapunov-based stability analysis.

关键词： Helicopters Rotors Attitude control Vectors Servomotors Stability analysis Equations

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A Continuous Robust control Design for a Class of Non-Affine Nonlinear Dynamics with Non-varnishing Disturbance

A Continuous Robust Control Design for a Class of Non-Affine...

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American control Conference

作者： Yao Zhang Bin Xian Bo Zhao Xiang Liu Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and Control Schoool of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781479932757

In this paper, the problem for the control of a class of single-input-single-output (SISO) non-affine nonlinear system with non-varnishing disturbance is investigated. A continuous nonlinear feedback structure is utilized to tackle with the uncertain dynamics in the system. By taking the time derivative of the origin system, a transformed affine-like form is derived. The first order derivative of control input appears linearly in the augmented dynamics with unknown control direction. Nussbaum-type function is incorporated to estimate the unknown control direction. A revised Lyapunov based analysis is carried out to prove that under some moderate assumptions, the Semi-global Uniformly Ultimately Bounded (SGUUB) tracking result is achieved and all the closed loop signals are bounded. Numerical simulation results are presented to illustrate the performance of the proposed control law.

关键词： Radio frequency Nonlinear dynamical systems Stability analysis Trajectory Tracking loops control design Equations

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Nonlinear asymptotic attitude tracking control of an underactuated 3-degree-of-freedom helicopter using neural network feedforward term

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控制理论与应用（英文版） 2013年第3期11卷 428-435页

作者： Xiang LIU Bin XIAN Jianchuan GUO Bo ZHAO Chen DIAO Institute of Robotics and Autonomous System Tianjin Key Laboratory of Process Measurement and Control and School of Electrical Engineering and Automation Tianjin University

This paper proposes a new asymptotic attitude tracking controller for an underactuated 3-degree-of-freedom （DOF） laboratory helicopter system by using a nonlinear robust feedback and a neural network （NN） feedforward term. The nonlinear robust control law is developed through a modified inner-outer loop approach. The application of the NN-based feedforward is to compensate for the system uncertainties. The proposed control design strategy requires very limited knowledge of the system dynamic model, and achieves good robustness with respect to system parametric uncertainties. A Lyapunov-based stability analysis shows that the proposed algorithms can ensure asymptotic tracking of the helicopter＇s elevation and travel motion, while keeping the stability of the closed-loop system. Real-time experiment results demonstrate that the controller has achieved good tracking performance.

关键词： 3-DOF helicopter Nonlinear Robust control Asymptotic tracking

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

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IFAC Proceedings Volumes 2014年第3期47卷 5333-5338页

作者： R. Haber U. Schmitz K. Zabet Institute of Process Engineering and Plant Design Laboratory of Process Automation Cologne University of Applied Science D-50679 Köln Betzdorfer Str. 2 Germany fax: +49-221-8275-2836 and Department for APC and process control technology Rheinland Refinery Shell Deutschland Oil GmbH Ludwigshafener Strasse 1 D-50389 Wesseling

PFC (Predictive Functional control) is a simple but very effective SISO (Single-Input Single- Output) 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.

关键词： predictive functional control distillation column programmable logical controller

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Optimal Tracking control for a Class of Continuous Time Complex-valued Systems Based on Adaptive Dynamic Programming Algorithm

Optimal Tracking Control for a Class of Continuous Time Comp...

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第三十三届中国控制会议

作者： Ruizhuo Song Frank L.Lewis Qinglai Wei Wendong Xiao School of Automation and Electrical Engineering University of Science and Technology Beijing University of Texas at Arlington Research Institute University of Texas at Arlington State Key Laboratory of Synthetical Process Automation Northeastern University The State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of Sciences

ISBN: (纸本)9781479947249

Based on the adaptive dynamic programming(ADP) algorithm,a new optimal tracking control method is proposed for a class of complex-valued nonlinear systems in this *** tracking error is rst de ned,and then the performance index function which is about the tracking error is *** transformation,the complex-valued tracking error system is mapped into *** optimal control method for the tracking error system is *** two neural networks are used to be as the critic network and action network,*** is proven that the closed-loop system is uniformly ultimately bounded based on Lyapunov ***,the simulation study is given to show the effectiveness of the proposed optimal tracking control method for complex-valued nonlinear system.

关键词： Adaptive dynamic programming,optimal control,neural network,complex-valued

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