Proportional, integral and derivative (PID) controller has been widely used in many aspects of the industries since its theory was published. In this paper, a systematic approach for the tuning strategy of MacPID cont...
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Proportional, integral and derivative (PID) controller has been widely used in many aspects of the industries since its theory was published. In this paper, a systematic approach for the tuning strategy of MacPID controller parameters for first order plus dead time (FOPDT) model is proposed. This method aims to simplify the process PID parameters adjustment and to achieve a desired effect in the same time. Moreover, the proposed rule is compared with other well-known tuning strategies to demonstrate its simplicity and accuracy.
This paper studies the problem of the mixed H 2 /H ∞ robust model predictive control (RMPC) for a class of linear systems with structure uncertainties and disturbance. A sufficient condition for the mixed H 2 /H ∞ ...
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This paper studies the problem of the mixed H 2 /H ∞ robust model predictive control (RMPC) for a class of linear systems with structure uncertainties and disturbance. A sufficient condition for the mixed H 2 /H ∞ RMPC are given in term of the solvability of linear matrix inequalities (LMI). In addition, the feasible conditions are discussed. Numerical examples illustrate the effectiveness of the proposed methods.
作者:
Qing SongXiaofan WangDepartment of Automation
Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China 200240 China
The problem of efficient routing arises in several applications such as transportation problems and network optimization. The increasing availability of large network data sets and the impact of networks on everyday l...
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The problem of efficient routing arises in several applications such as transportation problems and network optimization. The increasing availability of large network data sets and the impact of networks on everyday life has set new standard to route computations, necessitating research for even faster and more accurate shortest path algorithms. A hierarchical graph model is developed based on an effective partition of graphs for decomposing the complex search problem. A new heuristic hierarchical routing algorithm is then proposed to significantly reduce the search space by pruning searches towards unpromising subgraph branches. Experimental results on New York City road network demonstrate the performance of the algorithm.
The ART-2 network is a typical adaptive resonance theory based neural network approach for clustering purpose and has been successfully used in many fields. However, one of the fatal shortcomings of traditional ART-2 ...
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The ART-2 network is a typical adaptive resonance theory based neural network approach for clustering purpose and has been successfully used in many fields. However, one of the fatal shortcomings of traditional ART-2 is that its final results heavily depend on a pre-defined fixed vigilance threshold parameter, which makes it infeasible to be applied in different complicated applications. Another disadvantage of traditional ART-2 method is that the number of categories in the network will increase all the time with the continuous input. Considering these points, an improved algorithm of ART-2 has been presented in this paper called the Robust ART-2. We first systematically analyze the dynamic changes of the optimal vigilance threshold with the succession inputs and propose a new adaptive method to make the network itself can automatically choose the optimal threshold in various situations. Then we introduce a constraint parameter to confine the scale of ART-2 network by limiting the maximal number of categories of network. Simulation experiments including artificial and benchmark data sets demonstrate the effectiveness of our algorithm.
Ash deposition on heat transfer surfaces still to be a significant problem in power plant utility boilers. The effective ways to deal with this problem are accuracy on-line monitoring of ash fouling and soot-blowing. ...
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Ash deposition on heat transfer surfaces still to be a significant problem in power plant utility boilers. The effective ways to deal with this problem are accuracy on-line monitoring of ash fouling and soot-blowing. In this paper, the on-line ash fouling monitoring dynamic models of coal-fired utility boiler's heat transfer surfaces are proposed. The fundamental principle of the models is dynamic heat balance method. Finally, taking the economizer of a certain 300MW power plant utility boiler as the object of consideration, ash fouling of the transfer surface has been calculated with real time data from the DCS. The calculation results show the effectiveness of the dynamic models mentioned above. Some preliminary results analysis are shown aiming at the situation that the cleanliness factor has a obvious increased but its not corresponding to the soot-blowing point. The dynamic models are contributed to ash fouling monitoring and optimization of the soot-blowing.
Cognitive radio networks have made a dramatic shift towards variously cooperative paradigm to achieve fast, reliable spectrum sensing and effective spectrum usage in recent past In this paper, we develop a Flexibl...
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Cognitive radio networks have made a dramatic shift towards variously cooperative paradigm to achieve fast, reliable spectrum sensing and effective spectrum usage in recent past In this paper, we develop a Flexibly Cooperative Spectrum Sensing and Allocation (FCSSA) framework in cognitive radio networks. The proposed FCSSA framework captures the essential interactive function between cooperative spectrum sensing and allocation, which allows licensed channel and secondary users bargaining on their decisions, such as the enforceable requirements of spectrum sensing time, energy detection threshold and secondary users' payment for spectrum access, to maximize their utilities respectively. Moreover, we apply Stackelberg game to formulate the joint cooperative spectrum sensing and allocation design. The leader (authorized agent of licensed channel) decides spectrum sensing time and energy detection threshold according to the predictable behavior of secondary users. The followers (secondary users) make their payment decision underlying a non-cooperative game according to the limited information from licensed channel. Numeric simulations verify that our proposed jointly design framework in cooperative spectrum sensing and allocation can increase the agility and effectiveness of dynamic spectrum usage.
In order to estimate the state of urban traffic flow, a Probe-Vehicle-Tracking based method is proposed in this paper. The method collects traffic flow data with Global Positioning system (GPS)-equipped taxies, which ...
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In order to estimate the state of urban traffic flow, a Probe-Vehicle-Tracking based method is proposed in this paper. The method collects traffic flow data with Global Positioning system (GPS)-equipped taxies, which are taken as the probe vehicles. Then, the A* heuristic search algorithm is employed to judge the optimal vehicle tracking path. In addition, the average velocities of road links are calculated by considering the velocities of vehicle tracks as well as their corresponding credibility factors. Finally, an experiment with massive real-world traffic data in the surface road network of Shanghai was carried out, and the ground truth of the average velocity was obtained by repeating the videos shot on the 24 links in Shanghai downtown. The experiment results verify that the method has high accuracy and can be applied in engineering practice.
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 ...
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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.
作者:
Zhi ZhangLisheng HuDepartment 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 controlsystem 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...
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Steam generator water level controlsystem 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 controlsystem in nuclear power plants, where not much work has been done before. In terms of a class of steam generator water level controlsystems, 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.
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 i...
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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.
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