搜索结果: 76-90 共查到“知识库 系统学”相关记录446条 . 查询时间(4.314 秒)
A Novel Strange Attractor with a Stretched Loop
Novel Strange Attractor Stretched Loop Chaotic Dynamics
2012/4/26
The paper introduces a new 3D strange attractor topologically different from any other known chaotic attractors. The intentionally constructed model of three autonomous first-order differential equati...
参数激励下粘弹性圆柱壳的混沌行为
粘弹性圆柱壳 微分动力系统 Melnikov 函数 混沌 Poincaré映射
2014/1/13
基于大挠度薄壳的Donnell-Kármán理论和Kelvin-Voigt 粘弹性本构关系,研究了参数激励下粘弹性圆柱壳的混沌行为。导出了关于挠度和应力函数的控制方程,借助Galerkin原理将粘弹性圆柱壳的控制方程转化为二阶三次非线性微分动力系统。当轴压载荷与圆柱壳的材料参数满足a > 0时,用Melnikov 函数给出了系统发生混沌的临界条件,数值分析了轴压载荷和粘性阻尼系数对混沌运动的影响。...
混沌系统的参数估计是混沌系统控制和同步的前提。鉴于混沌系统具有初值敏感性、不能长期预测等特点，提出了一种基于粒子滤波(PF)的混沌系统参数估计和滤波方法，并将其用于Lorenz混沌系统的参数估计和滤波，在叠加噪声情况下对混沌系统进行仿真分析。结果表明，文中提出的滤波方法在估计偏差方面优于基于扩展卡尔曼滤波（EKF）的混沌系统参数估计和滤波方法，对混沌系统的参数估计和滤波是一种有效的方法。
含间隙裂缝的RC结构滞回系统混沌振动分析
RC结构 对称迟滞非线性 分段线性滞回模型 混沌行为
2013/10/14
研究了含间隙裂缝的钢筋混凝土结构对称滞回非线性问题. 建立了一种分段线性的对称滞回模型, 利用一次谐波线性方法求解结构系统的等效阻尼和等效刚度系数,得到了对称滞回非线性系统的等价线性方程. 通过数值分析比较了考虑和不考虑间隙与碰撞影响的两种情况下系统的混沌动力特性,研究表明: 不考虑间隙与碰撞影响的系统出现周期运动, 考虑间隙与碰撞影响系统
自适应信息素更新蚁群算法求解QoS组播路由
蚁群算法 QoS组播路由 信息素 混沌
2013/12/12
针对基本蚁群算法在求解QoS组播路由问题中存在的容易陷入局部最优和收敛速度慢的缺陷,提出一种自适应信息素更新蚁群算法对该问题进行求解。该算法在节点选择中引入混沌扰动,在算法前期依据各链路信息素浓度动态调整信息素的挥发因子,提高了全局搜索能力,后期根据解的优劣自适应更新信息素,使收敛性能得到显著提高。仿真实验表明,同等实验条件下,基本蚁群算法在第12次迭代收敛到局部最优费用值87;融合量子粒子群算法...
Extreme value laws in dynamical systems under physical observables
Extreme value laws dynamical systems physical observables
2011/8/18
Abstract: Extreme value theory for chaotic dynamical systems is a rapidly expanding area of research. Given a system and a real function (observable) defined on its phase space, extreme value theory s...
Differential Equations with Fractional Derivative and Universal Map with Memory
Fractional Derivative Universal Map Memory Chaotic Dynamics
2011/10/9
Abstract: Discrete maps with long-term memory are obtained from nonlinear differential equations with Riemann-Liouville and Caputo fractional derivatives. These maps are generalizations of the well-kn...
Mapping the Arnold web with a GPU-supercomputer
Arnold web GPU-supercomputer Chaotic Dynamics
2011/8/17
Abstract: The Arnold diffusion constitutes a dynamical phenomenon which may occur in the phase space of a non-integrable Hamiltonian system whenever the number of the system degrees of freedom is $M \...
Uniqueness of covariant Lyapunov vectors with respect to coordinate transformations
covariant Lyapunov vectors coordinate transformations Chaotic Dynamics
2011/8/17
Abstract: Lyapunov exponents are indicators for the chaotic properties of a classical dynamical system. They are most naturally defined in terms of the time evolution of a set of so-called covariant v...
Normal heat conduction in 1-dimensional momentum-conserved lattices of asymmetric interactions
Normal heat conduction asymmetric interactions 1-dimensional momentum-conserved lattices
2011/8/17
Abstract: We numerically investigate the heat conduction behavior of one-dimensional momentum-conserved lattice systems with {\it asymmetric} interactions. The heat conductivity is measured by couplin...
Cluster Synchrony in Systems of Coupled Phase Oscillators with Higher-Order Coupling
Cluster Synchrony Coupled Phase Oscillators Higher-Order Coupling
2011/9/29
Abstract: We study the phenomenon of cluster synchrony that occurs in ensembles of coupled phase oscillators when higher-order modes dominate the coupling between oscillators. For the first time, we d...
A New Viewpoint to the Discrete Approximation: Discrete Yang-Fourier Transforms of Discrete-time Fractal Signal
local fractional calculus fractal Yang Fourier transforms discrete approximation discrete Yang-Fourier transforms
2011/8/26
Abstract: It is suggest that a new fractal model for the Yang-Fourier transforms of discrete approximation based on local fractional calculus and the Discrete Yang-Fourier transforms are investigated ...
理论研究耦合反馈半导体激光器混沌同步及其在光学数字逻辑门中的应用, 构建了三种基本的全光XNOR, NOR, NOT 门以及光电复合NOR 光学数字逻辑门的物理模型, 定义了这些逻辑门的计算原理和方法. 基本物理方法是, 让外部光注入到2 个激光器中产生激光混沌输出, 通过两激光器激光的相互耦合及反馈实现混沌同步. 在此基础上, 利用光的外部调制方法让两相互耦合激光分别在振幅调制下控制混沌同步或非...
刚体单元及其在多体系统动力学中的应用
多体系统 刚体单元 转动惯量
2014/5/22
多体系统动力学分析软件要求人工输入形状复杂物体的质量、质心位置和转动惯量,而实际上这些参量并不容易获得。本文探索了一种以组成物体的刚体单元为基本要素的新方法,并结合实际需要具体构造了刚性四面体和刚性梁单元。以刚体单元为基础并内嵌网格剖分模块的分析软件能够自动获得这些参数,从而具备处理任何复杂系统的能力。仿真结果的对比分析验证了单元构造的正确性。