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Search Results: 1 - 10 of 111478 matches for " Qin Wei-Yang "
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Detecting faint variation in signal by synchronization of Duffing system
利用Duffing系统的同步识别信号中的微小差别

Qin Wei-Yang,Su Hao,Yang Yong-Feng,
秦卫阳
,苏 浩,杨永峰

物理学报 , 2008,
Abstract: For nonlinear Duffing system, a derived synchronization system is built and the method is proved. By the synchronization, the faint difference in stimulating signal of Duffing system can be detected. In simulation, when there occurs chaos in the original system, the responses of the original and derived system will exhibit synchronization for identical input signal and non-synchronization for different input signal. When the system is in quasi-periodic motion, the synchronization is still sensitive to the faint variation in the input signal. The simulation results prove the effectiveness of the method.
On Crack-Tip J-Integral for Orthotropic Composite Plate
关于复合材料单层板裂纹尖端的J积分

YANG Wei-Yang,ZHANG Shao-Qin,MA Yu-Lan,
杨维阳
,张少琴,马玉兰

数学物理学报(A辑) , 2001,
Abstract: By using a complex function method in this paper, the complex form of crack-tip .J -integral in non-principal elasticity directions for linear elastic orthotropic composite plate applied symmetric loading is derived. The path-independent of this .J -integral is proved. The concrete computing formula of this J -integral is obtained. The results derived in this paper are important in fracture analysis of composite structures.
The Fracture Analysis of Orthotropic Composite Plate Under Pure Twisting
纯扭正交异性复合材料板的断裂分析

YANG Wei-Yang,ZHANG Shao-Qin,ZHANG Xue-Xia,MA Yu-Lan,
杨维阳
,张少琴,张雪霞,马玉兰

数学物理学报(A辑) , 2004,
Abstract: Analysis of mechanical behaviors near crack tip for linear elastic orthotropic composite plate under pure twisting moment was done.By solving the boundary value problem of partial differential equation and using a complex variable function method, the expressions for bending moment, twisting moment, stress and displacement near crack tip are derived. Finally, numerical example is given.
Chaos synchroniztion by function coupling in a class of nonlinear dynamical system
一类动力学系统通过函数耦合实现混沌同步

Qin Wei-Yang,Sun Tao,Jiao Xu-Dong,Yang Yong-Feng,
秦卫阳
,孙涛,焦旭东,杨永锋

物理学报 , 2012,
Abstract: To realize the synchronization of nonlinear dynamical system, the general control method is unidirectional linear coupling. Research on function coupling of chaos synchronization is not enough, so there arises a question: for nonlinear dynamical system, if chaos synchronization is realized by linear coupling, whether can any type of function coupling always make the system go to chaos synchronization? In this paper, a class of nonlinear dynamical system is considered and the relation between linear coupling and function coupling is investigated. It is proved that if linear coupling can make chaos synchronization, then any function satisfying some conditions can do so too. The condition is given and proved. Finally for Duffing system, three coupling functions are used to prove the analytical result. The simulation results show that the conclusion is correct.
Generalized synchronization by coupling of restoring force and determination of parameters in vibration systems
非线性恢复力耦合的振动系统广义同步与参数识别

Qin Wei-Yang,Wang Hong-Jin,Gao Hang-Shan,
秦卫阳
,王红瑾,高行山

物理学报 , 2008,
Abstract: 对于一类非线性恢复力无法精确解析表达的简谐激励振动系统,建立了由原系统非线性恢复力激振的派生系统.证明了派生系统与原系统可以达到广义同步.派生系统可以自动与激励力频率、大小变化的原非线性振动系统保持广义同步.证明了由派生系统的广义同步,可以识别出原系统的阻尼系数、激振力幅值与频率.由Duffing系统的仿真计算结果可以看出,这种方法是有效的,而且识别精度较高.
Synchronization of a class of time-varied nonlinear vibration system
一类时变非线性振动系统的同步控制方法

Qin Wei-Yang,Wang Hong-Jin,Zhang Jin-Fu,
秦卫阳
,王红瑾,张劲夫

物理学报 , 2007,
Abstract: For a class of nonautonomous nonlinear vibration system,a corresponding derived system is constructed.A novel control method to realize the synchronization between the derived and the original system is presented.The method is proved by Lyapunov stability theory.The principle for choosing coupling parameters is given.For a Mathieu system excited by parameters and external force,the simulation is carried out.The result shows that the derived system can achieve fast synchronization with the original system under the action of chaos.The simulation for Duffing system excited by quasi-periodic force shows that the derived system can reach synchronization with the original system under the quasi-periodic motion.
The largest Lyapunov prediction method for the end issue of empirical mode decomposition
基于最大Lyapunov指数预测的EMD端点延拓

Yang Yong-Feng,Wu Ya-Feng,Ren Xing-Min,Qin Wei-Yang,Zhi Xi-Zhe,Qiu Yan,
杨永锋
,吴亚锋,任兴民,秦卫阳,支希哲,裘焱

物理学报 , 2009,
Abstract: 将最大Lyapunov指数预测引入到经验模式分解(EMD)的端点延拓中,提出用最大Lyapunov指数预测后的数据进行EMD分解的方法.该方法充分考虑了信号的内在特性,使端点处的延拓更加合理,从而使得三次样条曲线在端点处不会发生大的摆动.通过线性、非线性和实测信号的分析表明该方法能够有效地抑制端点效应.
Anticipated synchronization for a class of nonlinear vibration systems
非线性振动系统的预测同步方法研究

Qin Wei-Yang,Yang Yong-Feng,Wang Hong-Jin,Ren Xing-Min,
秦卫阳
,杨永锋,王红瑾,任兴民

物理学报 , 2008,
Abstract: 对于非线性振动系统,如果通过线性耦合可以实现派生系统与原系统的同步,则可以建立相应的预测派生系统,使得预测派生系统的响应与经τ时间以后的原系统响应同步,实现对原振动系统的非线性响应,特别是混沌响应的预测.也可以建立多级的预测派生系统,预测较长一段时间以后的振动系统未来的非线性响应.对于Duffing系统建立了6级的预测派生系统,可以比较精确地预测3s左右的原系统混沌响应.
Prediction of chaotic time series based on EMD method
基于EMD方法的混沌时间序列预测

Yang Yong-Feng,Ren Xing-Min,Qin Wei-Yang,Wu Ya-Feng,Zhi Xi-Zhe,
杨永锋
,任兴民,秦卫阳,吴亚锋,支希哲

物理学报 , 2008,
Abstract: In order to improve the nonlinear response prediction precision in a long period, the empirical mode decomposition (EMD) method is introduced in the nonlinear prediction. Here, the EMD method is used to decompose the signal, the rosenstein method is used to calculate the largest Lyapunov exponent (LLE), and then the prediction results are obtained on the basis of the LLE. The simulation results of Duffing equation, Lorenz system and cracked rotor system show that the EMD's signals have smaller LLE than the original signal. In this way, the maximum prediction time of a nonlinear signal can be obtained.
The Demand and Analysis Algorithms of OLAP Based on the Business Space
基于业务空间的OLAP需求与分析算法

WANG Wei-Yang,GUO Wei-Jun,
王未央
,葛卫军

计算机科学 , 2007,
Abstract: 需求算法与数据分析算法是联机数据分析的关键技术。本文介绍了基于业务空间的用户分析需求算法和数据分析算法,采用这些算法开发联机数据分析系统可以对用户屏蔽实际数据关系,用户只需从业务角度进行分析,就可以得到所需结果,系统具有良好的可扩展性。
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