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2015 5th International Conference on Computer Sciences and Automation Engineering(ICCSAE 2015)

作者： Feng Liang Lianyu Zhao Youjun Yue Zhuoyin Tong Lizhu Wang School of mechanical engineering Tianjin University of Technology Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System School of automation Tianjin University of Technology

Since the heat dissipation problemis harsh in high power LED lamp, in our studywe suggest an optimal design method of high-power LED lamps radiator based on the equivalent thermal circuit method, we abstract mathematical model of the heat dissipation system of the lamps, then chose several key parameters of radiator--spacing of fins S, height of fins H, thickness of fins t and number of Micro Heat Pipe ArrayN Has design parameters, and set minimum temperature of the chips as optimization objective. Based on the optimization algorithm we have mentioned, we designed a new radiator for high power LED lamps, through steady-heat-thermal analysis in ANSYS software, the junction temperature is far below the requirement. Therefore, the optimization algorithm can be effectively applied to radiator design of high power LED devices with the advantage of accuracy and swiftness.

关键词： optimal design micro heat pipe array high power LED lamp dissipation equivalent thermal circuit method

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Widely tunable chaotic fiber laser for WDM-PON detection

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Optoelectronics Letters 2014年第3期10卷 232-236页

作者：张娟杨玲珍徐乃军王娟芬张朝霞刘香莲 Institute of Optoelectronic Engineering College of Physics and OptoelectronicsTaiyuan University of Technology Key Lab of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of Technology

A widely tunable high precision chaotic fiber laser is proposed and experimentally demonstrated.A tunable fiber Bragg grating(TFBG) filter is used as a tuning element to determine the turning range from 1533 nm to 1558 nm with a linewidth of 0.5 nm at any *** wide tuning range is capable of supporting 32 wavelength-division multiplexing(WDM) channels with 100 GHz channel *** single wavelengths are found to be chaotic with 10 GHz *** full width at half maximum(FWHM) of the chaotic correlation curve of the different wavelengths is on a picosecond time scale,thereby offering millimeter spatial resolution in WDM detection.

关键词： WDM-PON 光纤激光器可调谐检测光纤布喇格光栅混沌空间分辨率单波长

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Design and analysis of a novel 3-D micromanipulator with large range of motion

Design and analysis of a novel 3-D micromanipulator with lar...

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IEEE/ASME (AIM) International Conference on advanced intelligent Mechatronics

作者： Zhigang Wu Yangmin Li Faculty of Science and Technology University of Macau Taipa Macao Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China

ISBN: (纸本)9781467391085

A novel parallel micromanipulator with large range of motion based on flexible hinges is designed and analyzed in this paper, which has three degrees of freedom motions along x, y and z axes. The Pseudo-Rigid-Body (PRB) model method is applied to obtain the kinetic performance and inputting stiffness. To calculate the natural frequency of the mechanism, the Lagrange method is used to achieve the dynamic and frequency equations. In addition, the working range of the architecture is also calculated, analyzed and compared with other similar structures by using ANSYS software, our designed micromanipulator has larger workspace than other existed stages.

关键词： Mathematical model Micromanipulators Force Fasteners Springs Kinetic energy Computer architecture

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synchronization of coupled reaction-diffusion neural networks with mixed delays

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Complexity 2016年第S2期21卷

作者： Ping He Yangmin Li Department of Electromechanical Engineering Faculty of Science and Technology University of Macau Taipa Macao Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China

The reaction-diffusion neural network is often described by semilinear diffusion partial differential equation (PDE). This article focuses on the asymptotical synchronization and synchronization for coupled reaction-diffusion neural networks with mixed delays (that is, discrete and infinite distributed delays) and Dirichlet boundary condition. First, using the Lyapunov–Krasoviskii functional scheme, the sufficient condition is obtained for the asymptotical synchronization of coupled semilinear diffusion PDEs with mixed time-delays and this condition is represented by linear matrix inequalities (LMIs), which is easy to be solved. Then the robust synchronization is considered in temporal-spatial domain for the coupled semilinear diffusion PDEs with mixed delays and external disturbances. In terms of the technique of completing squares, the sufficient condition is obtained for the robust synchronization. Finally, a numerical example of coupled semilinear diffusion PDEs with mixed time-delays is given to illustrate the correctness of the obtained results. © 2016 Wiley Periodicals, Inc. Complexity 21: 42–53, 2016

关键词： asymptotical synchronization synchronization coupled reaction-diffusion neural networks linear matrix inequality (LMI) partial differential systems (PDSs) mixed delays

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Passivity-based synchronization of a new hyperchaotic Lorenz system

Passivity-based synchronization of a new hyperchaotic Lorenz...

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IEEE Conference on Cybernetics and intelligent systems

作者： Ping He Yangmin Li Department of Electromechanical Engineering Avenida da Universidade Taipa Macao Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China

ISBN: (纸本)9781467373395

In this paper, a passivity-based synchronization method is proposed for a new hyperchaotic Lorenz system based on Lyapunov stability theory and linear matrix inequality (LMI) approach. On the basis of the property of the passive system, the passive controller is designed and synchronization of two identical new hyperchaotic Lorenz systems with different initial conditions is realized. Finally, numerical simulations are presented to demonstrate the effectiveness of the proposed chaos control and synchronization schemes.

关键词： Synchronization control systems Lyapunov methods Complex networks Chaotic communication

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Research of the crack propagation control in a nonlinear rotor

Research of the crack propagation control in a nonlinear rot...

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IEEE International Conference on Mechatronics and Automation

作者： Jun Liu Yong Fan Jianen Chen Xiaofeng Wang Hongbiao Xiang School of Mechanical Engineering Tianjin University of Technology Tianjin China Tianjin key laboratory of the Design and Intelligent control of the Advanced Mechanical system Tianjin University of Technology Tianjin China

ISBN: (纸本)9781479970995

Due to the continuing action of alternating loads, the micro defects of rotor's materials and the micro traumas in the mechanic processing will easily cause the crack propagation and even the catastrophic accidents. The vibration characteristics of the rotor system, the crack breathing states and the crack breathing periods are investigated with different parameters of the synchronous state through the numerical simulation, which are all based on the dynamic model of the nonlinear cracked rotor and the describing function of the breathing crack. The crack breathing states are also studied under the asynchronous state. The paper proposes a novel method of the delaying crack propagation using an Electro-Magnetic Actuator (EMA) in order to realize the vibration control and the delaying crack propagation. By comparing influences of the crack breathing state caused by changes of different parameters (rotational speed, crack angle, crack depth and nonlinear parameters, etc.), the paper summarizes the mutation regulations of the crack breathing state in the synchronous and verifies the feasibility of delaying the crack propagation mechanism. The result of the research shows that the EMA can control the vibration of the nonlinear cracked rotor and delay the crack propagation in the running process of the nonlinear cracked rotor.

关键词： Rotors Vibrations Mathematical model Numerical simulation Numerical models Vibration control Finite element analysis

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Dynamic modeling for high-performance controller design of a UAV quadrotor

Dynamic modeling for high-performance controller design of a...

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International Conference on Information and Automation (ICIA)

作者： Yi-Rui Tang Yangmin Li Department of Electromechanical Engineering University of Macau Macao SAR China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China

ISBN: (纸本)9781467391054

This paper presents a systematic and comprehensive modeling approach for the derivation of a nonlinear dynamic model of a unmanned aerial vehicle (UAV) quadrotor. The model incorporates a couple of significant aerodynamic effects impacting on the quadrotor flight in different regimes. The controller is accordingly designed to accommodate both specific and uncertain dynamics of the quadrotor. The control laws of linear quadratic regulator (LQR) coupled with sliding mode control (SMC) are applied to the controller design so as to perform the optimal and robust control of the vehicle. The experimental results demonstrate the designed control algorithms are capable of delivering an remarkable performance on tracking of the reference input signals.

关键词： Rotors Blades Aerodynamics Mathematical model Vehicle dynamics Force Nonlinear dynamical systems

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Characteristics of a piloted digital flow valve based on flow amplifier

Characteristics of a piloted digital flow valve based on flo...

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International Conference on Fluid Power and Mechatronics (FPM)

作者： Taotao Li Jiahai Huang Yanhong Bai Long Quan Shengguo Wang Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan Technology Center of Taiyuan Heavy Machinery Group Yuci Hydraulic Industry Shanxi China Taiyuan University of Technology Taiyuan Shanxi CN University of Technology Shanxi China

ISBN: (纸本)9781479987719

Hydraulic switching techniques which have less throttling losses, good repeatability and can be controlled intelligently have been largely developed. The biggest challenge is the hydraulic fluctuation. It is generated in the process of opening and closing the valve. A two-stage digital flow valve operated by Pulse Width Modulation (PWM) signal is studied in this paper. The main stage is cartridge valve based on flow amplifying principle; the pilot stage is high-speed on/off valve. The fluctuation characteristic of the digital flow valve is investigated using theoretical derivation and simulation analysis. The results show that the outlet flow fluctuation is influenced by many parameters such as the frequency and duty ratio of PWM signal, the volume of control chamber, etc. It can be weakened through the proper design of these parameters. Although the fluctuation exists, the mean outlet flow can be proportionally controlled by adjustment of the duty ratio of the control signal.

关键词： Valves Fluctuations Switches Frequency control Pulse width modulation Fluids

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Studies on the Dynamic Behaviours and Mechanisms of Hepatic Vessel Perfusion with Simple Vessel Models

Studies on the Dynamic Behaviours and Mechanisms of Hepatic ...

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IEEE International Conference on Mechatronics and Automation

作者： Jun Liu Yong Fan Yihe Liu Hongbiao Xiang Tianjin key laboratory of the Design and Intelligent Control of the Advanced Mechanical System Tianjin University of Technology BinshuiXidao 391 Tianjin China Tianjin key Laboratory of Organ Transplantation Transplant surgery of Tianjin First Central Hospital Fukang Road 24 Tianjin China

ISBN: (纸本)9781479970995

The hydrodynamic behaviours of the perfusion process (cleaning) of the liver vessels before the operation was studied. A straight and a curved First-Class vessel entity model with foreign matter and the control equations of turbulent liquid in the vessels were established. With the physical parameters of a medical perfusion liquid measured, an estimation method of perfusion parameters was proposed. The simulation was performed by changing technical parameters of the perfusion. It is based on the control equations of turbulent liquid in the vessels and the preliminary calculated results using the vessel models. The simulation was performed by changing technical parameters of the perfusion. It is based on the control equations of turbulent liquid in the vessels and the preliminary calculated results using the vessel models. With the increasing perfusion velocities, the pressure and the velocity field increased in the two types of the vessel models. The negative trans-mural pressure and recirculation zones appeared and located on the foreign matter. Because of the influence of the vessel shape, the fluid dynamics behaviours in the curved vessel model are more complicated than those in the straight vessel model.

关键词： First-Class Vessel Model Equations of Turbulent Liquid Perfusion Fluid-Solid Coupling Calculation Mechanism Study

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Fragmentation of a spin-1 mixture in a magnetic field

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Physical Review A 2015年第1期91卷 013628-013628页

作者： Jie Zhang Xue Hou Bin Chen Yunbo Zhang College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 P.R. China Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Taiyuan 030024 P.R. China Institute of Theoretical Physics Shanxi University Taiyuan 030006 P.R. China

We study ground-state quantum fragmentation in a mixture of a polar condensate and a ferromagnetic condensate when subjected to an external magnetic field. We pay more attention to the polar condensate, due to the fact that fragmentation of a polar condensate, which typically occurs only in a very weak magnetic field, can occur in a mixture at higher magnetic fields, where both atom numbers and number fluctuations will remain of a macroscopic magnitude, of the order of N. The role of the ferromagnetic condensate is to provide a uniform and stable background which can delay the rapid shrinkage of the zero-component population and make it possible to capture “superfragmentation.” Our method has potential applications in measurement of the interspecies spin-coupling interaction by adjusting the magnetic field.

关键词： Mixtures

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