首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 0 毫秒
1.
时滞惯性流形及近似时滞惯性流形族   总被引:7,自引:0,他引:7  
李开泰  侯延仁 《数学学报》2000,43(3):435-444
时滞惯性流形是对耗散系统惯性流形、近似惯性流形的最新发展,它基于对 大小涡分量间相互作用更细致的观察,即改变了惯性流形和近似惯性流形方法中大小 涡分量间相互作用为瞬时行为的隐含假定,而认为这种作用与系统的历史相关的.本 文结出了一类耗散系统时滞惯性流形的存在性证明,由于其存在性不需要“谱间隔条 件”保证,因而时滞惯性流形是广泛存在的.随后我们引出了一类离散的时滞惯性流 形,并在此基础上构造了一种近似时滞惯性流形族,分别给出了它们近似时滞惯性流 形的误差估计,结果显示这种新方法为构造稳定和高精度的算法提供了可能.  相似文献   

2.
3.
弱阻尼KdV方程中长期动力学行为研究*   总被引:9,自引:5,他引:4  
证明了周期边界条件下弱阻尼KdV方程存在近似惯性流形.该流形使吸引子被确切定义的有限维光滑流形逼近.并由此概念引出新的数值方法很好地用于研究动力系统长期行为.  相似文献   

4.
蔡开仁 《数学杂志》1998,18(2):139-149
本文证明了一个拼嵌的爱因斯坦流形中的任何超曲面在沿其平均曲率向量演化时,如果初发始曲面满足保持其截曲率为正的某些条件,则在有限时间内超曲而将收缩成一点。  相似文献   

5.
    
§1.Introduction  SincethediscoverybyKorteweganddeVries(1895)andtheworkofZabuskyandKrustal(1965),therehavebeennumeroussignificantcontributionstotheKortewegdeVries(KdV)equationsandthesolitonsolutions,especiallythemethodofInverseScatteringTransformandthemethodof…  相似文献   

6.
This paper deals with the existence of solitary waves for Korteweg-de Vries equation with time delay. Based upon the inertial manifold theory and differential manifold geometric theory, the existence of solitary wave solution is proved when the delay is small enough. Up to now, studies on solitary wave for such delay differential equation are not available, so the results of this paper are new.  相似文献   

7.
    
We introduce and discuss a one-dimensional kinetic model of the Boltzmann equation with dissipative collisions and variable coefficient of restitution. Then, the behavior of the Boltzmann equation in the quasi elastic limit is investigated for a wide range of the rate function. By this limit procedure we obtain a class of nonlinear equations classified as nonlinear friction equations. The analysis of the cooling process shows that the nonlinearity on the relative velocity is of paramount importance for the finite time extinction of the solution.https://doi.org/10.1051/m2an:2000127  相似文献   

8.
本文讨论了离散化方程(u^n+1-u^n)/h+Au^n+1=F(u^n)的惯性流形,证明了在h充分小且算子A满足谱间隔条件下,该方程存在一个惯性流形Mh=Graph(φh),φh是惯性映射的不动点,与现有文献「1,2」不同,我们仅假设主算子A是解析半群无空凶且有紧豫解式,不需要A是自伴的假设。  相似文献   

9.
    
0IntroductionInertialmanifolds(IM)arenewobjectsthathavebeenintroducedinrelationwiththestudyoflargetimebehaviorofnonlineardissipativePDE,see[1].In[2],theyareextendedtodiscretizeddynamicsstemmingfromdissipativePDE.Frommathematicalpointofview,thesearesmootllfiniteLipschitzmanifoldsthatareinviantbytheflowofassociatedsolutions,andattractallthetrajectorieswithexponentialspeed,see[1].Fromphysicalpointofview,IMmodeltheinteractionlawsbetweensmallandlargestructureofaturbulentflow,andrepresentsitspe…  相似文献   

10.
殷朝阳  赵怡  黄煜 《数学进展》2003,32(1):91-100
本文主要研究级联系统的解的长时间性态,利用非自治无穷维动力系统发展起来的斜积流和延伸相平面,能量估计等方法。在满足一定的谱间断条件下。运用技巧难度大的三锥相嵌的方法,证明了其惯性流形的存在性。同时揭示出级联系统与非自治系统的长时间性态本质上的关联性。  相似文献   

11.
For a class of systems of parabolic equations, conditions represented by a finite set of linear functionals on the phase space that uniquely determine the long-time behavior of solutions are found. The cases in which it is sufficient to define these determining functionals only on a part of the components of the state vector are singled out. As examples, systems describing the Belousov-Zhabotinsky reaction and the two-dimensional Navier-Stokes equations are considered. Translated fromMatematicheskie Zametki, Vol. 63, No. 5, pp. 774–784, May, 1998.  相似文献   

12.
    
This article deals with the problem of control of canonical non‐integer‐order dynamical systems. We design a simple dynamical fractional‐order integral sliding manifold with desired stability and convergence properties. The main feature of the proposed dynamical sliding surface is transferring the sign function in the control input to the first derivative of the control signal. Therefore, the resulted control input is smooth and without any discontinuity. So, the harmful chattering, which is an inherent characteristic of the traditional sliding modes, is avoided. We use the fractional Lyapunov stability theory to derive a sliding control law to force the system trajectories to reach the sliding manifold and remain on it forever. A nonsmooth positive definite function is applied to prove the existence of the sliding motion in a given finite time. Some computer simulations are presented to show the efficient performance of the proposed chattering‐free fractional‐order sliding mode controller. © 2015 Wiley Periodicals, Inc. Complexity 21: 224–233, 2016  相似文献   

13.
郭柏灵  林国广 《数学研究》1999,32(4):327-340
本文利用对非牛顿粘性不可压缩流方程对时间 t的解析性和长时间渐近性估计 ,具体构造了它的近似惯性流形 ,并得出收敛阶估计 .  相似文献   

14.
对由一类非线性抛物型变分不等方程所描述的无穷维动力系统,给出了存在全局吸引子及弱近似惯性流形的充分条件.  相似文献   

15.
本文对一类广义Kuramoto-Sivashinsky型方程证明了惯性流形的存在性,并对其维数作了估计同时研究了该方程的不变雄性质和轨线的强挤压性.  相似文献   

16.
本文利用中心流形定理和映射的分岔理论,研究了一类离散的捕食与被捕食系统的Flip分岔的存在性与稳定性,并给出了数值模拟的结果。  相似文献   

17.
OGY方法的改进及证明*   总被引:9,自引:1,他引:9       下载免费PDF全文
OGY方法是混沌控制最重要的方法.通过选取系统参数的小变化,使双曲不动点变“稳定”.本文改进了OGY方法中的参数选取方法,并且完成了对OGY方法的严格证明.  相似文献   

18.
低模态下弱阻尼KdV方程约化形式的数值分析   总被引:5,自引:1,他引:4       下载免费PDF全文
给出了低模态下弱阻尼KdV方程近似惯性流形的约化形式,并在五模态下作数值分析,有关数值分析结果与非线性谱分析结果相类似  相似文献   

19.
本文分别在全空间和半空间两种情形下讨论一类非线性发展方程弱解的长时间性态.证明了其弱解在L^2范数下衰减速率和线性热方程一致,分别为t^-n/2(1-r-1/2)和t^-n/2(1/r-1/2)-1/2。  相似文献   

20.
The present paper deals with the long-time behavior of a class of nonautonomous retarded semilinear parabolic differential equations. When the time delays are small enough and the spectral gap conditions hold, the inertial manifolds of the nonautonomous retard parabolic equations are constructed by using the Lyapunov-Perron method.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号