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检索条件"机构=Tianjin Key Laboratory for Control Theory& Applications in Complicated System"

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Hopf Bifurcation Analysis and Circuit Simulation of a New Chen Hyper-Chaotic system

Hopf Bifurcation Analysis and Circuit Simulation of a New Ch...

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International Workshop on Chaos-Fractals Theories and applications (IWCFTA)

作者： Enzeng Dong Zhiling Lin Zaiping Chen Zengqiang Chen Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China Department of Automation Nankai University Tianjin China

In this paper, a new hyper-chaotic system is generated by introducing a state variable into Chen system. This system contains five system parameters and two cross-product terms, can generate hyper-chaotic attractors with proper parameters regions. The theoretical analysis demonstrates that a Hopf bifurcation arises at zero equilibrium point. The basic dynamic properties of the proposed system are investigated via Lyapunov exponents spectrum and bifurcation diagram. Finally, the hyper-chaotic circuit is designed and realized by using the Multisim software, which confirms that the proposed system can be achieved.

关键词： Bifurcation Orbits Eigenvalues and eigenfunctions Chaotic communication Software

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Notice of Retraction: The parametric modeling of modified spur gear and automatic generation of the related gear parameters

Notice of Retraction: The parametric modeling of modified sp...

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International Conference on Electric Information and control Engineering (ICEICE)

作者： Xiaolin Pan Xinhua Zhao School of Mechanical Engineering Tianjin University of Technology Tianjin China Tianjin Key Laboratory of Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

This article has been retracted by the publisher.

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UART interface design based on DM642 video surveillance system and wireless network module

UART interface design based on DM642 video surveillance syst...

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IEEE International Conference on Software Engineering and Service Sciences (ICSESS)

作者： Baofeng Zhang Kuigang Zhang Junchao Zhu Xinzhi Li Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology China Tianjin Design & Research Institute of Electric Drive China

TMS320DM642(DM642) is a widely used digital media DSP chip. As with no Universal Asynchronous Receiver/Transmitter(UART) provided, it is difficult to communicate with other UART devices,especially in wireless video surveillance *** paper uses on-chip multichannel buffered serial port(McBSP) and enhanced direct memory access(EDMA) to implement UART function based on DM642 and wireless communication module LC6311. The initialization of the McBSP and the data coding/decoding inprocess of transmitting/receiving are discussed in *** method can implement the communication between DM642 and LC6311 with easy program flow and no other devices. It enriches interface function of the DM642 and provides a new interface design for wireless video monitoring system.

关键词： Registers Digital signal processing Synchronization Wireless communication Software control systems Data communication

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Application of BP neural network intelligent PID controller based on GA in electrode regulator systems of electric arc furnace

Application of BP neural network intelligent PID controller ...

引用

International Conference on Communication Software and Networks, ICCSN

作者： Wang Hong-jun Li Yan-wei Yue You-jun Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China School of Electrical Engineering Tianjin University of Technology Tianjin China

Aimed at the characteristics of strong nonlinearity, uncertainty, time-variance and, strong coupling etc for AC electric arc furnace (EAF), and the traditional PID can not achieve desired control effect. The paper proposes a PID control algorithm based on optimized BP neural network using genetic algorithm, which is applied in electrode regulator systems of electric arc furnace to design the optimized controller. The algorithm optimizes the initial weights of BP neural network by using genetic algorithm firstly, and then adjusts the PID parameters by using BP neural network. The simulation indicates that the algorithm is feasible, and unit with intelligent PID controller has better accuracy and dynamic characteristics.

关键词： Genetic algorithms Electrodes Optimization Algorithm design and analysis Furnaces Tuning Heuristic algorithms

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Analysis of fire resistance of portal steel frame structure under different connections

Analysis of fire resistance of portal steel frame structure ...

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International Conference on Mechanic Automation and control Engineering (MACE)

作者： He Fu Ling Chen Nan Wang School of Mechanical Engineering Tianjin University of Technology Tianjin China Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China

This paper makes finite element analysis of fire resistance under different connections for portal steel frames. Fire protection not apply on the secondary beam, there are two ways of girder-column's connection to calculate: beam connection, and pin connection. The results of the analysis indicate that the mechanical behavior of steel frames in fire conditions is dominated by the effects of thermal loading, thermal expansion and thermal gradient. The overall deformation of pin connection is larger than it of beam connection, and the stress suffered by beam structure is bigger than pin structure. When the overall beam steel frames' connection is taken by local pin connection, the stress of structure will reduce, helping to ensure strength and stability of steel structures. The deformation of the girder can be reduced when the beam connection is taken place by pin connection. The conclusion provides a reference for structural engineers on fire resistant design of steel frame.

关键词： Steel Fires Structural beams Finite element methods Thermal expansion Presses Resistance

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The design of the embedded digital controller

The design of the embedded digital controller

引用

2011 International Conference on Electric Information and control Engineering, ICEICE 2011

作者： Chen, Guanglai Wang, Shoujun Li, Lifei Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin 300384 China School of Mechanical Engineering Tianjin University of Technology Tianjin China

ISBN: (纸本)9781424480395

This paper describes the detailed design process and methods, which combines the using of embedded CPU with a special motion control chip embedded motion controller. Through the hardware platform design and software design of the embedded motion controller, it can know that the controller has some advantages, such as low cost, small size, low power consumption, feature-rich and stable characteristics. Also the controller can achieve high speed and high precision control requirements. © 2011 IEEE.

关键词： controllers

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Application of dual-port RAM in data controller

Application of dual-port RAM in data controller

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2011 International Conference on Electric Information and control Engineering, ICEICE 2011

ISBN: (纸本)9781424480395

This paper introduces the dual-port RAM IDT7007 in the bulit-in PLC system. It describes the basic structure and the hardware block diagram of the built-in PLC. Also it explains the working principle,the solution to the competition problem and the interface circuit of the dual-port RAM IDT7007. By using the dual-port RAM IDT7007 of data exchange of program of the SCM,it shows that the using of the dual-port RAM IDT7007 can simplify the circuit greatly and guarantee the reliability of the two-mechine system. © 2011 IEEE.

关键词： Electronic data interchange

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Based on different loading areas of steel structure framework simulation research of fire resistance performance

Based on different loading areas of steel structure framewor...

引用

2011 2nd International Conference on Mechanic Automation and control Engineering, MACE 2011

作者： Wang, Nan Chen, Ling Fu, He Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin 300384 China School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China

ISBN: (纸本)9781424494392

Based on finite element analysis software ANSYS, a company warehouse properties of door type steel frame structure has been studied under the action of fire. Taking the whole structure as research object, the paper used beam element and shell element to simulate the column, prime beam, second beam and concrete slab in the structure respectively. When linking the slab and the beam by beam connection and linking the column and the beam by pin connection at the same time, the influences of the whole structure have been considered based on different areas affected by fire. The results of analysis draw three conclusions. Firstly, large-span and strong constraints beam of structure and column-beam joint are the adverse regions affected by fire. Secondly, the column which bears multiple components is the weak link of steel structure. Finally, it is the temperature gradient in the direction of slab thickness that plays a crucial role in the ability of the overall fire resistance of steel structure. © 2011 IEEE.

关键词： Fire protection

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Analysis of fire resistance of portal steel frame structure under different connections

Analysis of fire resistance of portal steel frame structure ...

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2011 2nd International Conference on Mechanic Automation and control Engineering, MACE 2011

作者： Fu, He Chen, Ling Wang, Nan Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin 300384 China School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China

ISBN: (纸本)9781424494392

关键词： Deformation

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The application of BP Neural Network based on improved PSO in BF temperature forecast

The application of BP Neural Network based on improved PSO i...

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International Conference on Electrical and control Engineering (ICECE)

作者： Hongjun Wang Dexiong Li Zhuoqun Zhao Huijuan Qi Lina Liu Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin China Shijiazhuang Institute of Railway Technology Shijiazhuang China HNV College of Mechanical and Vehic Engineering Changsha China

The BP network has the disadvantages such as low learning efficiency, low speed of convergence, easily falling into the local minimum state, poor ability to adapt, ect. For PSO algorithm, it is fast for convergence, especially at the initial stage, simple for the computing, and is easy to implement. Compared with the genetic algorithms, it does have not the complex operations of hybrid codecs, mutation, so it is a good optimization algorithm. However, PSO algorithm also has some shortcomings it is more and more slow for convergence rate at the late evolution of the algorithm. In this paper, a new BP Neural Network based on improved Particle Swarm Optimization (PSO) is proposed. The convergence speed of this algorithm and the capacity of searching global extremum is increased through adjusting the adaptive capacity of learning factor. The simulation results illustrate that the improved PSO is superior to the standard BP algorithm and particle swarm optimization.

关键词： Particle swarm optimization Blast furnaces Iron Biological neural networks Temperature measurement Neurons Convergence

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