检索结果-内蒙古大学图书馆

synchronization of coupled reaction-diffusion neural networks with mixed delays

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

来源：评论

学校读者我要写书评

暂无评论

Passivity-based synchronization of a new hyperchaotic Lorenz system

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Tooth Surface design for Variable Transmission Ratio Bevel Gearing

引用

Applied Mathematics 2015年第10期6卷 1685-1695页

作者： Nan Yang Dawei Zhang Yanling Tian School of Mechanical Engineering Tianjin University Tianjin China Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System School of Mechanical Engineering Tianjin University of Technology Tianjin China

A novel CAD method for tooth profile based on the gearing feature has been proposed in this paper, and this method could be applied to the variable transmission ratio and three-dimension situation. The two pitch curves of the two gears can be generated due to the given transmission ratio. The tooth profile curves are formed in each coordinate system of its pitch curve by the gearing process. Finally, the tooth profile could be extracted and translated into a real dimension by CAD method. It is provided a simply thought for tooth profile design to avoid so much complicated mathematical reasoning.

关键词： Computer-Aided design Computational Geometry Gear design Gear Geometry

来源：评论

学校读者我要写书评

暂无评论

Path planning for mobile robot using the novel repulsive force algorithm

Path planning for mobile robot using the novel repulsive for...

引用

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

作者： Yunwei Jia Guoqiang Yin Lianyu Zhao Xueping Li Siyue Sun School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System

A new type of repulsive force algorithm is proposed to solve the problem of local minimum and the target unreachable of the classic artificial potential field method in this paper. The Gaussian function that is related to the distance between the robot and the target is added to the traditional repulsive force, solving the problem of the goal unreachable with the obstacle nearby;variable coefficient is added to the repulsive force component to resize the repulsive force, which can solve the local minimum problem when the robot, the obstacle and the target point are in the same line. The effectiveness of the algorithm is verified by simulation experiments based on MATLAB.

关键词： Artificial potential field localminimum goal unreachable mobile robot

来源：评论

学校读者我要写书评

暂无评论

The Validity Analysis of Regression: Combining Uniform Experiment design with Nonlinear Regression

引用

Applied Mathematics 2015年第6期6卷 996-1008页

The data topology structure of uniform experiment design (UD) is too complex to be reasonable regressed. In this paper, the principle and method of distinguish the training data and testing data were described to make a reasonable regression when uniform experiment design combined with support vector regression (SVR). Two equivalent ways which were the smallest enclosing hypersphere perceptron (SEH) and the enclosing simplex perceptron (ES) were provided to discover the topology relationship of the process parameter datum. To give an application, a series of experiments about laser cladding layer quality were conducted by UD to get the relationship of load, velocity and wearing capacity. Results showed that only the testing datum recommended by the two perceptrons got a good forecasting by SVR. Therefore, the two perceptrons could guide experiments with process parameter data of complex topology structure. Further, the application could be extended over a much wider field of experiments.

关键词： the enclosing simplex support vector machine uniform experiment design the smallest enclosing hyper sphere

来源：评论

学校读者我要写书评

暂无评论

Dynamic Dexterity Evaluation of a 3-DOF 3-PUU Parallel Manipulator Based on Generalized Inertia Matrix

Dynamic Dexterity Evaluation of a 3-DOF 3-PUU Parallel Manip...

引用

IEEE International Conference on Robotics and Biomimetics

作者： Song Lu Yangmin Lit Department of Electromechanical Engineering University of Macau Avenida da Universidade Taipa Macao China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin 300384 China

ISBN: (纸本)9781467396769

Dynamic performance evaluation that takes into account the inertial properties is an important issue for both the behavior analysis and dimensional synthesis of parallel kinematic manipulators (PKMs). Firstly, by virtue of the principle of virtual work, the complete inverse dynamic model of a 3-prismatic-universal-universal (PUU) parallel manipulator is formulated, which does not neglect the inertial and gravitational properties of the struts. The condition number of generalized inertia matrix can evaluate the mapping from joint accelerations to realizable joint torques. This paper utilizes the condition number of generalized inertia matrix as the index to evaluate the dynamic dexterity property of a 3-PUU PKM which possesses three translational degrees of freedom. For a given set of geometrical and inertia parameters, numerical simulations indicate that the global dynamic dexterity performance of this type of 3-PUU PKM is consistent with the local dynamic dexterity on a specific z--plane, it has the best dynamic dexterity at the center of task workspace and decreases from the center to the edge of task workspace.

关键词： Parallel kinematic manipulator performance evaluation dynamic dexterity generalized inertia matrix

来源：评论

学校读者我要写书评

暂无评论

Optimal design of High Power LED Lamp Heat Dissipation Based on Equivalent Thermal Circuit Method

Optimal Design of High Power LED Lamp Heat Dissipation Based...

引用

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

来源：评论

学校读者我要写书评

暂无评论

Research of the crack propagation control in a nonlinear rotor

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Effects of the pectus excavatum on the spine in patients of pectus excavatum with scoliosis

Effects of the pectus excavatum on the spine in patients of ...

引用

第十一届全国生物力学学术会议暨第十三届全国生物流变学学术会议

作者： Weihong Zhong Jinduo Ye Jifu Liu Chunqiu Zhang Linwei Lü Chunyue Zhang Bolun Liu Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Military General Hospital of Beijing PLA

Objective:Pectus excavatum(PE)is the most frequently observed congenital deformity of the chest with a deep depression of the sternum in the anterior thoracic *** more than 20%of pectus excavatum patients were reported to have *** to now,no comprehensive analysis about the impact that pectus excavatum has on scoliosis has been performed,although previous research has involved correlation among scoli-

关键词： Effects of the pectus excavatum on the spine in patients of pectus excavatum with scoliosis

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：