检索结果-内蒙古大学图书馆

作者： Zhao, Jun-Cheng Fang, Yi-Ming Li, Jian-Xiong Key Lab of Industrial Computer Control Engineering of Hebei Province College of Electric Engineering Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9789881725592

A robust predictive control algorithm based on memory state feedback is proposed for a class of uncertain discrete time system with input constraint and multiple state delays. By introducing Lyapunov-Krasovskii function and using linear matrix inequality (LMI) method, the algorithm can convert the infinite time domain optimization problems into linear programming problems. Sufficient conditions of the existence and explicit expression for the memory state feedback controller are obtained, and the control input can satisfy constraint as well. Asymptotical stability of the closed-loop system and minimum of robust performance index can be guaranteed simultaneously. Finally, the simulation results illustrate the effectiveness of the proposed algorithm. © 2011 Chinese Assoc of Automati.

关键词： Linear matrix inequalities

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Time Synchronization in WSNs: A Maximum Value Based Consensus Approach

Time Synchronization in WSNs: A Maximum Value Based Consensu...

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IEEE Conference on Decision and control

作者： Jianping He Peng Cheng Ling Shi Jiming Chen State Key Lab. of Industrial Control Technology Zhejiang University Hangzhou 310027 China Department of Electric and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

ISBN: (纸本)9781612848006

This paper proposes a novel synchronization algorithm for wireless sensor networks (WSNs), the Maximum Time Synchronization (MTS), which is based on maximum value consensus approach. The main idea is to maximize the local information to achieve a global synchronization. Compared with the existing consensus-based synchronization protocols, the main advantages of our protocol include: i) a faster convergence speed such that the synchronization can be completed in a finite time;ii) simultaneous compensation for both the skew and the offset. We provide a rigorous proof of convergence to global synchronization and also give the upper bound of the convergence time. Moreover, the protocol is completely distributed, asynchronous, and robust against packet losses, nodes failure and the addition of new nodes. Some numerical examples are presented to demonstrate the efficiency of our protocol.

关键词： clock recovery maximum value Converge local information. Skew Asynchronous

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Multi-PID control of Hammerstein systems with input multiplicity

Multi-PID control of Hammerstein systems with input multipli...

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Chinese control Conference (CCC)

作者： Jingjing Du Xinliang Zhang Chunyue Song School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo P. R. China State Key Lab. of Industrial Control Technology Institute of Industrial Process Control Zhejiang University Hangzhou P. R. China

Hammerstein models are popular in describing nonlinear chemical processes. The general control strategy for Hammerstein models is the nonlinearity inversion method, which is unfortunately inapplicable to Hammerstein systems with input multiplicity. To overcome this difficulty, a Multi-PID control approach is proposed. Thus, a complex control problem is solved by a conventional and easy control strategy. A Heat Exchanger process is simulated to demonstrate the effectiveness of the Multi-PID control approach.

关键词： Process control Heating Steady-state Analytical models Predictive models Switches

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Output Feedback Adaptive Robust Learning control of a Class of Nonlinear Systems with Periodic Disturbances

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IFAC Proceedings Volumes 2011年第1期44卷 4874-4879页

作者： Xiangbin Liu Zhongsheng Hou Bin Yao Hongye Su Mingxuan Sun Advanced Control Systems Laboratory School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 P. R. China. (Tel: 86-10-5168-4105) School of Mechanical Engineering Purdue University West Lafayette IN 47907 U.S.A. State Key Lab. of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 P. R. China College of Information Engineering Zhejiang University of Technology Hangzhou 310032 China

Abstract In this paper, a discontinuous projection-based output feedback adaptive robust learning control (OARLC) scheme is constructed for a class of nonlinear systems in a semi-strict feedback form by incorporating an observer and a dynamic normalization signal. Since only output signal is availab.e for measurement, an observer is firstly designed to provide exponentially convergent estimates of the unmeasurable states. Using certain known basis functions to capture the characteristics of unknown general periodic disturbances, the discontinuous projection type adaptation law can then be used to tune the amplitudes of those basis functions on-line to recover the unknown general periodic disturbances asymptotically. The estimation errors due to the unknown initial states, uncompensated disturbances, and the uncertain nonlinearities are also effectively dealt with via certain robust feedback at each step of the proposed OARLC backstepping design. The resulting controller achieves a guaranteed transient and a prescribed final tracking accuracy for output tracking performance. In addition, when the general periodic disturbances fall within the approximation ranges of the periodic basis functions, asymptotic output tracking performance is achieved as well.

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A Constructive Procedure based on Dynamic Scaling for Adaptive control of Nonlinearly Parameterized Nonlinear Systems

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IFAC Proceedings Volumes 2011年第1期44卷 120-125页

作者： Xiangbin Liu Romeo Ortega Hongye Su Jian Chu Advanced Control Systems Laboratory of School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 P. R. China. (Tel: 86-10-5168-4105) Laboratoire des Signaux et Systèmes CNRS–SUPELEC 91192 Gif–sur–Yvette France State Key Lab. of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 P. R. China

Abstract A new framework to design immersion and invariance adaptive controllers for nonlinearly parameterized, nonlinear systems was recently proposed by the authors. The key step is the construction of a monotone mapping, via a suitable selection of a controller tuning function, which has to satisfy some integrability conditions—this translates into the need to solve a partial differential equation (PDE). In this paper this result is extended providing some answers to the questions of characterization of “monotonizable” systems and solvability of the PDE. First, adding to the design a nonlinear dynamic scaling, we obviate the need to solve the PDE. Second, for the case of factorizable nonlinearities , the following results are established. (i) It is shown that the monotonicity condition is satisfied if a linear matrix inequality is feasible. (ii) Directly verifiable involutivity conditions that ensure the solution of the PDE are presented. (iii) An explicit formula for the required tuning function is given, provided the regressor matrix satisfies some rank conditions. Hence, adding a dynamic scaling, this yields a constructive solution to the problem.

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A new LMS algorithm with application to fixed satellite communications

A new LMS algorithm with application to fixed satellite comm...

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International Workshop on Advanced Computational Intelligence

作者： Li, Haibin Han, Yanguang Guan, Xinping Key Lab. of Industrial Computer Control Engineering Hebei Province Qinhuangdao CO 066004 China

ISBN: (纸本)9781424463343

A distinctive new LMS algorithm is proposed in his paper. Both fast convergence rate and small steady state rror can be obtained through non-linear weighting N errors of the current moment and past moments in this algorithm. The algorithm analyzed that the ideal step size is achieved by increasing the error information, building new nonlinear relations between step size factor and error function and eliminating the effect of correlated noise sequences. Then the new algorithm is applied to the fixed satellite communications system in which the channel is affected by multipath effect and weather conditions attenuation. Simulation results show that the new algorithm converges faster than usual algorithms under approximate steady state performance. The signal BER performance is greatly improved with the new adaptive algorithm equalizer in the fixed satellite communications system.

关键词： Satellite communication systems

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Optimization of schedule with multi-objective for tandem cold rolling mill based on IAGA

Optimization of schedule with multi-objective for tandem col...

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2010 International Conference on Mechanic Automation and control engineering, MACE2010

作者： Che, Haijun Han, Xinyan Yang, Jingming Li, Lianfei Key Lab. of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9781424477388

To tackle the multi-objective problem in the process of tandem cold rolling, a mathematical model of multi-object optimization is presented. Taking equal relatively power and prevent slippage as objective functions. Aiming to the problem of Standard Genetic Algorithm (SGA), such as premature convergence, oscillation and over-randomization in iterative process, an Improved Adaptive Genetic Algorithm (IAGA) is applied to optimize the system. The algorithm decides the crossover rate and mutation rate of chromosome based on individual adaptive value in calculation process, make the start phase mutate obviously and later phase stable slowly and ensure the population development, seeking balance and entire convergence. Simulated results show that, in comparison with the actual rolling schedule, the optimization rolling schedule makes the reasonable distribution of tandem cold rolling power, gives the full play to equipment capacity, reduces the rate of slippage, improves the product quality, and the proposed method is demonstrated to be competent. ©2010 IEEE.

关键词： Multiobjective optimization

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A security testing approach for WSN protocols based on object-oriented attack model

A security testing approach for WSN protocols based on objec...

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International Conference on Computational Intelligence and Security

作者： Yue Qi Qingqi Pei Yong Zeng Chao Yang Shu-po Bu State Key Laboratory of Integrated Service Networks Xidian University Xi'an China Key Laboratory of Computer Networks and Information Security of Ministry of Education China Key Lab. of Comput. Networks & Inf. Security Minist. of Educ. Guangzhou China Department of Electronic Engineering Suzhou Institute of Industrial Technology Suzhou China

In this paper, we propose an object-oriented attack model to represent a protocol attack in WSN detailedly. The model describes multiple attributes of an attack, including its principle, impact, interdependent relationships with other attacks, etc. Then, on the basis of the attack model and the FSM description method, we present a security testing approach for WSN protocols, in order to evaluate the security of the tested protocols. Finally, we take the TinyPK protocol and Sybil attack for example to implement our design, and the Protocol Security Testing Report shows as expected that the TinyPK cannot resist the Sybil attack. Thus, the security testing approach proposed is feasible.

关键词： Protocols Wireless sensor networks Object oriented modeling Testing Authentication Availab.lity

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Stereo vision robot obstacle detection based on the SIFT

Stereo vision robot obstacle detection based on the SIFT

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Global Congress on Intelligent Systems

作者： Shao, Nuan Li, Hui-Guang Liu, Le Zhang, Zhan-Ling College of Electrical Engineering Yanshan University Key Lab. of Industrial Computer Control Engineering of Hebei Province Qinhuangdao 066004 China

ISBN: (纸本)9780769543048

This paper presents a method of binocular vision obstacle detection based on SIFT feature matching algorithm. First, a model of depth measurement based on stereo vision is built, it does not require resume the three-dimensional coordinate of spatial point under the world coordinate system. According to the characteristics of the model, we proposed the binocular stereo vision calibration method based on parallel optical axis;Finally, the pixel coordinates of matching points are extracted with SIFT feature matching algorithm and completed the distance detection of the obstacle. The experimental results demonstrated the feasibility and effectiveness of the method. © 2010 IEEE.

关键词： Stereo vision

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A less-conseryative robust H∞ guaranteed cost fault-tolerant control of networked control system

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Kongzhi yu Juece/control and Decision 2011年第12期26卷 1768-1776页

作者： Li, Wei Wang, Yan-Fei College of Electrical and Information Engineering Lanzhou University of Technology Lanzhou 730050 China Gansu Province Key Lab. of Industrial Advanced Process Control Lanzhou University of Technology Lanzhou 730050 China

The problem of robust H∞ guaranteed cost fault-tolerant control for a class of networked control system(NCS) with time-varying delay and packet dropout is investigated. A new model is employed to represent the linear controlled plant in the NCS, a sufficient condition for a robust H∞ guaranteed cost integrity design with failures of actuator or sensor is given in terms of a delay-dependent approach. And the design method of the optimal robust H∞ guaranteed cost fault-tolerant controllers is given with LMIs constraints. Moreover, a less conservative method is obtained due to the lower bound of the time-delay introduced in the model and appropriate free-weighting matrices introduced during the proof. A numerical example shows the effectiveness of the proposed method.

关键词： Networked control systems

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