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International Conference on Modelling, Identification and control (ICMIC)

作者： Daxiao Wang Mantian Xue Leijun Xiang Weidong Zhang Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China Department of Automation Shanghai Jiaotong University China

This article describes a split-range tuning method based on the well developed IMC-PID controller for the parameters of the MacPID controller. The goal is to simplify the tuning complexity. Detailed tuning procedure is provided. The FOPTD model is employed to compare the proposed idea with the well known tuning methods, such as Ziegler-Nichols, Cohen-Coon and MacPID method to illustrate the simplicity and the practicality of our strategy.

关键词： Tuning Uncertainty Mathematical model Robustness Process control Equations Feedback control

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Performance assessment for the water level control system in steam generator of the nuclear power plant

Performance assessment for the water level control system in...

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Chinese control Conference (CCC)

作者： Zhi Zhang Lisheng Hu Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China 200240 China

Steam generator water level control system is the most important components of the nuclear power plant. The operating steam generator water level controller is increasingly recognized as a capital asset that should be maintained and monitored routinely. However, this issue as the control loop performance assessment problem is still open. Considering this issue, a major contribution of this paper is to take the performance assessment technology into this industrial area, steam generator water level control system in nuclear power plants, where not much work has been done before. In terms of a class of steam generator water level control systems, two PI controller systems, performance assessment methods for the plant with stable and unstable zeros are developed at specific power level. An numerical example shows the effectiveness of the proposed method.

关键词： Level control Benchmark testing Polynomials Transfer functions Feeds Generators

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Social learning in multi-true-state networks

Social learning in multi-true-state networks

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Chinese control Conference (CCC)

作者： Aili Fang Lin Wang Jiuhua Zhao Xiaofan Wang Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China 200240 China

Social learning focuses on the opinion dynamics in the society, which has attracted more and more researchers recently. Different from the existing results on the consensus of social learning in complex networks with one true state, in this paper we study the social learning in the network society with multi-true-states. A new network social learning model is constructed, where agents from different groups receive different signal sequences generated by different true states. Each agent updates his belief by combining a Bayesian rule on the external signal and a non-Bayesian rule related with his neighboring agents. We analyze the dynamical process, and find that the beliefs of all agents are oscillating all the time and can not access to their corresponding true states, which is totally different from the consensus on social learning with one-true-state. Furthermore, by calculating the largest Lyapunov exponents, chaos is found in the social learning with multi-true-sates.

关键词： Chaos Bayesian methods Social network services Time series analysis Economics Silicon Thumb

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Partitioning Graphs to Speed Up Point-to-Point Shortest Path Computations

Partitioning Graphs to Speed Up Point-to-Point Shortest Path...

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IEEE Conference on Decision and control

作者： Qing Song Xiaofan Wang Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China

ISBN: (纸本)9781612848006

Computing the shortest paths in graphs is a fundamental problem with numerous applications. The rapid growth of network in size and complexity has made it necessary to decrease the execution time of the shortest path algorithm. We develop an effective graph partition method to retrieve Balanced Traversing Distance partitions and constitute a hierchical graph model based on the decomposed network for accelerating the path queries. We then propose a new heuristic hierarchical routing algorithm that can significantly reduce the search space by pruning unpromising subgraph branches. We evaluate our approach experimentally under different network partition schemes to show the gain in performance.

关键词： Partitioning algorithms Communities Algorithm design and analysis Heuristic algorithms Roads Acceleration Upper bound

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Performance Assessment for a Class of Nonlinear systems

Performance Assessment for a Class of Nonlinear Systems

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2011 China control and Decision Conference(2011中国控制与决策会议 CCDC)

作者： Zhi Zhang Li-Sheng Hu Xue-Lian Zhang Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China

Performance assessment for nonlinear control systems is of great current interest. In this paper, a class of nonlinear systems are concerned. The analytical benchmark performance and the associated benchmark controller are established by minimizing the variance of the measurement output. Similar to. ltering and correlation analysis (FCOR) algorithm, the calculation of performance index in higherorder statistics forms is proposed. To facilitate assessment, a filtering or whitening method is also presented. The white noise sequence is estimated by dynamic principal component analysis (DPCA) based on the nonlinear autoregressive exogenous (NARX) model. By comparison with traditional method, the proposed method can effectively avoid biased estimation of control performance for nonlinear systems. The numerical example indicates the effectiveness of the proposed performance assessment method.

关键词： Performance Assessment Minimum Variance control Nonlinear systems Higher-order Statistics Dynamic Principal Component Analysis Nonlinear Autoregressive Exogenous Model.

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Plant-wide temperature drop monitoring in run-out table strip cooling process

Plant-wide temperature drop monitoring in run-out table stri...

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International Symposium on Advanced control of Industrial Processes (ADCONIP)

作者： Yi Zheng Shaoyuan Li Department of Automation Shanghai Jiaotong University Shanghai China Department of Automation Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Jiaotong University Shanghai China

Since the strip transient temperature can only be measured at a few positions inside the cooling section in hot-rolled strip laminar cooling process, a new approach of monitoring strip transient temperature in cooling process is proposed. A simple and accurate state space representation is designed firstly to describe the temperature drop of strip. An Extended Kalman Filter (EKF) is designed to reconstruct the strip temperature distribution because of its simple designation. Considering coordinating the convergence rate and stability, a trade-off feed-back coefficient of EKF is chosen. The reliability of the proposed method was demonstrated by the experimentation in one steel Ltd.

关键词： Monitoring Cooling

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Dynamic Shared control for Human-Wheelchair Cooperation

Dynamic Shared Control for Human-Wheelchair Cooperation

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2011 IEEE International Conference on Robotics and automation(2011年IEEE世界机器人与自动化大会 ICRA 2011)

作者： Qinan Li Weidong Chen Jingchuan Wang Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of ChinaShanghai 200240Chinaand State Key Laboratory of Robotics and System (HIT)Harbin 150001China

Shared control is a common used method for human and wheelchair cooperation. However, most of the previous shared control methods didn’t think much of the effect caused by the difference in the user’s control ability. The control weight of a user in these methods is irrelevant to the user’s capability or the driving conditions. In this paper, a dynamic shared control method is proposed to adapt wheelchair’s assistance to the variations of user performance and the environmental changes. Three evaluation indices including safety, comfort and obedience are designed to evaluate wheelchair performance in real time. A minimax multi-objective optimization algorithm is adopted to calculate the user’s control weight. The results of lab experiments and elderly home field tests show that this method can adapt the degree of wheelchair’s autonomy to the user’s control ability and it makes driving wheelchair much easier for elder people.

关键词： Wheelchairs Trajectory Safety Velocity control Indexes Senior citizens Manuals

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A Rectangle Detection Method for Real-Time Extraction of Large Panel Edge

A Rectangle Detection Method for Real-Time Extraction of Lar...

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International Conference on Image and Graphics (ICIG)

作者： Zhe Wu Qingjie Kong Jiapeng Liu Yuncai Liu Department of Automation and Key Laboratory of China MOE for System Control and Information Shanghai Jiaotong University Shanghai China

The problem of real-time rectangle detection on high-resolution image arises in actual panel production. This paper proposes a robust real-time method for panel rectangle detection. In line extraction part, a new technique called "Crossing Dilation" is proposed to improve the Progressive Probabilistic Hough Transform performance, to extract long line segments that are not perfectly straight in large sparse binary image. The rectangle is detected using the proposed rectangle fitting method. Experiments on a variety of real cases of large panels are executed, some of which are badly disturbed by the fake edges caused by the dust in the background region. The results show great real-time performance on all the cases, and the proposed method is robust to the disturbances and different panel sizes.

关键词： Image edge detection Image segmentation Real time systems Robustness Transforms Probabilistic logic Detection algorithms

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Dynamic anti-windup design in anticipation of actuator saturation

Dynamic anti-windup design in anticipation of actuator satur...

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作者： Wu, Xiongjun Lin, Zongli Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing of Ministry of Education Shanghai 200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia P.O. Box 400743 Charlottesville VA 22904-4743 United States

ISBN: (纸本)9781457700804

In a traditional anti-windup design, the anti-windup mechanism is set to be activated as soon as the control signal saturates the actuator. A recent innovation of delaying the activation of the anti-windup mechanism, both static and dynamic, until the saturation reaches to a certain level of severity has led to a performance improvement of the resulting closed-loop system. More recently, it has been shown that significant further performance improvements can be obtained by activating a static anti-windup mechanism in anticipation of actuator saturation, in comparison with the delayed activation design. This paper demonstrates that anticipatory activation of a dynamic anti-windup mechanism would also lead to significant performance improvements over both the immediate and delayed activation schemes. © 2011 AACC American Automatic control Council.

关键词： Chemical activation

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Model Predictive control system Based on FPGA and A Case Study

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IFAC Proceedings Volumes 2011年第1期44卷 9266-9271页

作者： Nan Yang Dewei Li Jun Zhang Yugeng Xi Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Shanghai 200240 Joint Institute of UMich-SJTU Shanghai Jiao Tong University Shanghai 200240 China

Abstract Model predictive control (MPC) algorithm has been widely applied in industry process control systems since last century, like petro-refining and other chemical processes. However, it is rarely used in field controllers due to the complexity of online optimization. This paper introduces a new MPC system based on the field programmable gate array (FPGA) chip. In order to make MPC controller more efficient, a hybrid way is adopted to design the quadratic programming (QP) solver on the FPGA chip. Thus, the controller can solve the optimization problem of MPC in a pretty short time. The whole control system is implemented on a Virtex-4 FPGA chip and applied to the angle servo control of two motors with a satisfactory result. The experiment shows that it is possible to apply MPC algorithm in field controller by the proposed design.

关键词： FPGA model predictive control field controller motor servo

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