共查询到20条相似文献，搜索用时 15 毫秒
1.
Tracking tests for different polymer materials were carried out to investigate the chaotic behavior of surface discharge.The discharge sequences measured during the discharge process were analyzed for finding the evidence of chaos existence.Four kinds of nonlinear analysis methods were adopted:estimating the largest Lyapunov exponent,calculating the fractal dimension with increasing the embedding dimension,drawing the recurrence plots,and plotting the Poincare maps.It is found that the largest Lyapunov exponent of the discharge is positive,and the plot of fractal dimension,as a function of embedding dimension,will saturate at a value.The recurrence plots show the chaotic frame-work patterns,and the Poincare maps also have the chaotic characteristics.The results indicate that the chaotic behavior does exist in the discharge currents of the tracking test. 相似文献
2.
混沌系统的特性可用其混沌吸引子在相空间中的轨迹来表征。大量的研究表明、一个混沌吸引子是由无穷多个不稳定的周期轨道所组成的。通过对不稳定周期轨道的幅度或相位进行调制，则可实现对信息的保密传输。据此，在一个混沌时间序列的每一个不稳定周期轨道中、通过调制不同的信息流，就可以用单一的混沌时间序列来传输多路信息。 相似文献
3.
乔娜 《山西大学师范学院学报》2008,(5):33-35
20世纪80年代兴起的混沌理论,给我们这个被确定论统治数百年的世界带来了巨大的冲击,它自身具有的奇怪吸引子、对初始值的极度敏感性和自相似性等特征给医学、自然和经济领域带来了冲击和变革,但同时也存在着混沌等于复杂、随机是内在的以及混沌是不可控制的、混沌是万能的误解。从方法论上说,混沌是一个能塑造我们人类未来的潜力无限的领域。 相似文献
4.
一种新的混沌系统的复合结构分析 总被引：1，自引：0，他引：1
分析了一种新的三维自治混沌系统吸引子的复合结构. 首先证明了该混沌系统存在5个平衡点, 讨论了系统的控制参数大小同平衡点稳定性之间的关系. 其次, 对吸引子在y-z平面的运动轨迹作了理论分析, 描述了吸引子存在及消失的原因. 最后, 通过对该混沌系统运动轨迹在不同控制参数作用下的计算机仿真, 揭示了涡卷数不同的混沌吸引子形成的过程. 表明该混沌系统具有复合结构, 能够演化成其他的三维自治混沌系统. 理论分析及仿真结果对分析其他具有相似结构的混沌系统具有重要的参考价值. 相似文献
5.
符兴昌 《周口师范学院学报》2006,23(2):59-61
从理论分析和仿真实验分别研究了三阶非线性自治电路的混沌现象,以及产生混沌的原因。通过仿真得到相图和时域图,从而描述了“双涡卷”混沌吸引子是非周期有序运动的混沌现象。 相似文献
6.
分析了具有混沌动力学特征的非线性三阶自治电路，给出了混沌电路中非线性电阻的构造方法，通过EWB软件对混沌电路进行了计算机仿真，实际硬件电路板测试得到混沌吸引子、倍周期分岔、周期性窗口等预期分析结果，此结果对深入研究混沌理论及混沌的同步和控制有积极借鉴作用。 相似文献
7.
The refrigerant mixture of ethanol aqueous was applied to the parallel type pulsating heat pipe (PHP). The operation characteristics of the PHP were analyzed by means of experiment and nonlinear chaotic theory. Moreover, the relationship between the running state and attractor was described. The results indicate that starting power, stable running power and dry burning transition power are about 64.08 W, 148.68 W and 234.0 W respectively. The cycle and amplitude of PHP initially decrease and then increase with the increasing power. However, the data are welldistributed in a certain range. The running state is in agreement with the attractors, and the changing process for attractors is as follows: the attractors first disperse in the whole phase space, then present mass status, and finally show band distribution. 相似文献
8.
1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｉｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔｎ ＧａＡｓａｎｄａｎｕｍｂｅｒｏｆｏｔｈｅｒｃｏｍｐｏｕｎｄｓｅｍｉｃｏｎｄｕｃｔｏｒｓｃａｎｅｘｈｉｂｉｔｓｅｌｆ ｓｕｓｔａｉｎｅｄｃｕｒｒｅｎｔｏｓｃｉｌｌａｔｉｏｎｓｉｎｔｈｅｍｉｃｒｏｗａｖｅｒａｎｇｅｗｈｅｎｔｈｅａｐｐｌｉｅｄｄｒｉｆｔｆｉｅｌｄｅｘｃｅｅｄｓｔｈｅｃｈａｒａｃｔｅｒｉｓｔｉｃｔｈｒｅｓｈｏｌｄｖａｌｕｅ .Ｓｅｍｉｃｏｎｄｕｃｔｏｒｓａｒｅａｐｐｒｏｐｒｉａｔｅｍａｔｅｒｉａｌｓｆｏｒｕｎｄｅｒｓｔａｎ… 相似文献
9.
对复摆模型的强迫振动方程进行数值求解,显示出复摆运动在外驱动力作用下由倍周期分岔走向混沌,验证了其混沌解的"蝴蝶效应",并得到了复摆作混沌运动的几个奇怪吸引子. 相似文献
10.
Probability density function (PDF) method is proposed for analysing the structure of the reconstructed attractor in computing the correlation dimensions of RR intervals of ten normal old men.PDF contains important information about the spatial distribution of the phase points in the reconstructed attractor.To the best of our knowledge, it is the first time that the PDF method is put forward for the analysis of the reconstructed attractor structure.Numerical simulations demonstrate that the cardiac systems of healthy old men are about 6-6.5 dimensional complex dynamical systems.It is found that PDF is not symmetrically distributed when time delay is small, while PDF satisfies Gaussian distribution when time delay is big enough.A cluster effect mechanism is presented to explain this phenomenon.By studying the shape of PDFs, that the roles played by time delay are more important than embedding dimension in the reconstruction is clearly indicated.Results have demonstrated that the PDF method represents a promising numerical approach for the observation of the reconstructed attractor structure and may provide more information and new diagnostic potential of the analyzed cardiac system. 相似文献
11.
基于蔡氏电路和蔡氏二极管电路,构建蔡氏电路数学模型．利用仿真和数值计算给出双涡卷吸引子的相图、时域图和频谱图,并分析在平衡点处的动力学特性．研究结果表明：在一定参数和初值的条件下,可以产生双涡卷吸引子,且蔡氏电路输出波形是非周期的、不可以预测的,对初值具有敏感性,其频谱是连续的． 相似文献
12.
陈立群 《商丘师范学院学报》1996,(Z3)
基于极点配置推导出含延迟坐标系统镇定嵌入混沌吸引子中不稳定不动点的ＯＧＹ控制算法和预迭代控制算法，从而具体地揭示了极点配置与控制混沌镇定方案之间的联系． 相似文献
13.
Probability density function (PDF) method is proposed for analysing the structure of the reconstructed attractor in computing the correlation dimensions of RR intervals of ten normal old men. PDF contains important information about the spatial distribution of the phase points in the reconstructed attractor. To the best of our knowledge, it is the first time that the PDF method is put forward for the analysis of the reconstructed attractor structure. Numerical simulations demonstrate that the cardiac systems of healthy old men are about 6 - 6.5 dimensional complex dynamical systems. It is found that PDF is not symmetrically distributed when time delay is small, while PDF satisfies Gaussian distribution when time delay is big enough. A cluster effect mechanism is presented to explain this phenomenon. By studying the shape of PDFs, that the roles played by time delay are more important than embedding dimension in the reconstruction is clearly indicated. Results have demonstrated that the PDF method represents a promising numerical approach for the observation of the reconstructed attractor structure and may provide more information and new diagnostic potential of the analyzed cardiac system. 相似文献
14.
根据汽车隔振基本原理,提出了悬架振动的混沌描述问题.采用汽车制动悬架隔振效率实验台获取了实验汽车前、后悬架的振动曲线,计算了系统参数如一阶固有频率和阻尼比,并计算了混沌参数如最小嵌入相空间维数和关联维,获得了汽车悬架的隔振性能、混沌参数与系统参数三者之间的对应关系.研究结果表明:对于吉普车型,可采用最小嵌入相空间维数Mmin评价前悬架隔振性能的变化,Mmin值越小,隔振性能趋差,对应于前悬架的刚度和阻尼值越小;对于不同车型,可采用关联维D2区分吉普车型或轿车型的悬架,吉普车型的D2值高于轿车型. 相似文献
15.
基于闭环混沌同步通信系统,分析了激光器混沌同步的质量同关联维数的关系。数值模拟结果表明,在适当偏置电流取值下,可以从两激光混沌系统中奇异吸引子的关联维数上看出混沌同步的好坏。由此说明,关联维数可以作为表征半导体激光器混沌同步好坏的依据。 相似文献
16.
简要介绍了混沌通信的发展概况,总结了混沌适用于保密通信的几个特点,重点阐述和分析了两大类混沌保密通信系统的应用方案。最后对混沌通信在实际应用中所需解决的问题进行了讨论。 相似文献
17.
混沌,是“遂古之初”洪水神话的折射——古人在雨水（洪水）与黑暗问所建立的一种对应物,具有水黑和混融不清的整体特点,这也是神话世界的起点。随着不同文化因素的渗入,人的认识的发展,在流传过程中发生了气化、人格神化等嬗变。 相似文献
18.
给出一种基于广义混沌序列的多幅图像隐藏算法.利用图像的迭代混合可以将多幅图像隐藏于一幅图像之中,借助Logistic混沌动力学系统过程既非周期又不收敛,且对初始条件敏感性,产生实数值混沌序列,利用该混沌序列生成广义混沌序列,作为隐藏算法的混合因子,提高了隐藏算法的安全性.数值实验结果表明,算法简单易行,安全性好. 相似文献
19.
澳大利亚职业生涯教育的"蝴蝶模型":介绍及启示 总被引：1，自引：0，他引：1
澳大利亚职业生涯的蝴蝶模型源于洛仑兹的蝴蝶吸引子和职业生涯的混沌理论,关注职业生涯教育中计划之外的意外事件。该模型由简洁的双圈图及操作步骤组成,主要具有三方面特点:设计与实施中学生本位思想的贯穿与融合;职业生涯教育微观领域的延展与推进;对传统职业生涯教育方式的挑战与革新。其对我国职业院校职业生涯教育的启示是:构建具有本土特色的职业生涯教育体系;创新职业生涯教育的方式方法;提高职业生涯教育师资队伍专业化水平。 相似文献
20.
粘弹性开敞浅壳的动力学性质 总被引：1，自引：0，他引：1
On the basis of the Kármán-Donnell theory of thin shells with large deflections and the Boltzmann laws for linear viscoelastic
materials, the mathematical model for viscoelastic open shallow shells was formulated. By using the Galerkin average method,
the original integro-partial-differential dynamic system was simplified as a integro-ordinary-differential dynamic system,
which can be transformed into a ordinary differential dynamic system by introducing new variables. The dynamical behavior
was studied by some classical methods. Dynamical properties, such as, chaos, strange attractor, limit cycle etc., were discovered.
Supported by the Development Foundation of Shanghai Municipal Commission of Education (99A01) 相似文献