共查询到20条相似文献,搜索用时 218 毫秒
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研究了线性半向量二层规划问题的全局优化方法. 利用下层问题的对偶间隙构造了线性半向量二层规划问题的罚问题, 通过分析原问题的最优解与罚问题可行域顶点之间的关系, 将线性半向量二层规划问题转化为有限个线性规划问题, 从而得到线性半向量二层规划问题的全局最优解. 数值结果表明所设计的全局优化方法对线性半向量二层规划问题是可行的. 相似文献
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以下层问题的K-T最优性条件代替下层问题,将线性二层规划转化为相应的单层规划问题,通过分析单层规划可行解集合的结构特征,设计了一种求解线性二层规划全局最优解的割平面算法.数值结果表明所设计的割平面算法是可行、有效的. 相似文献
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一类半线性椭圆方程解的存在性 总被引:1,自引:1,他引:0
本文研究了一类具有临界增长的半线性椭圆型方程.采用最近A.Ambrosetti所提出的扰动方法研究这类问题,得到这类问题的解的存在性.与通常所用的临界点理论方法相比较,本文解的存在性在较弱条件下可得. 相似文献
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本文讨论一类两参数非线性椭圆型方程边值问题.得到原问题的外部解,引入伸长变量和在边界和外部解的内部间断点附近设置局部坐标系,构造边界层和内部层校正项.在适当的条件下,利用微分不等式,证明边值问题激波解的存在性并研究解的渐近性态. 相似文献
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讨论了一类奇摄动燃烧问题.利用伸长变量,构造了问题解的边界层和内部层,并且得到了形式渐近解.再利用微分不等式证明了解的一致有效性. 相似文献
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下层多目标规划问题的Pareto最优解的精确性对于成功求解半向量二层规划问题具有决定性作用.本文基于多目标规划问题的KKT背离度量方程,设计了具有确定性终止准则的半向量二层规划问题的粒子群算法.最后,利用线性半向量二层规划算例和非线性半向量二层规划算例进行数值仿真,仿真结果表明,算法中的KKT背离度量方程能有效控制下层问题Pareto最优解的精度,从而确保问题最优解的真实有效性. 相似文献
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本文研究一类奇摄动拟线性椭圆型方程Dirichlet问题的内层现象,利用偏微分不等式理论,通过构造具有内层校正的上、下解函数,给出了奇摄动问题内层现象的解的存在性及其余项估计。 相似文献
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A. F. Voevodin 《Numerical Analysis and Applications》2009,2(1):1-12
For linear singularly perturbed boundary value problems, we come up with a method that reduces solving a differential problem to a discrete (difference) problem. Difference equations, which are an exact analog of differential equations, are constructed by the factorization method. Coefficients of difference equations are calculated by solving Cauchy problems for first-order differential equations. In this case nonlinear Ricatti equations with a small parameter are solved by asymptotic methods, and solving linear equations reduces to computing quadratures. A solution for quasilinear singularly perturbed equations is obtained by means of an implicit relaxation method. A solution to a linearized problem is calculated by analogy with a linear problem at each iterative step. The method is tested against solutions to the known Lagerstrom-Cole problem. 相似文献
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研究了一类奇摄动拟线性边值问题, 在适当的条件下, 用合成展开法构造出该问题的形式近似式, 并应用不动点定理证明了激波解的存在性及其渐近性质. 相似文献
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Mingkang Ni Yafei Pang N. T. Levashova O. A. Nikolaeva 《Differential Equations》2017,53(12):1567-1577
A singularly perturbed boundary value problem for a second-order quasilinear ordinary differential equation is studied. We consider a new class of problems in which the nonlinearities experience discontinuities, which leads to the appearance of sharp transition layers in a neighborhood of the points of discontinuity. The existence of solutions is proved, and their asymptotic expansion with an internal transition layer is constructed. 相似文献
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一类非线性奇摄动方程的激波问题 总被引:4,自引:1,他引:3
利用奇摄动理论和匹配原理,讨论了一类非线性奇摄动方程的激波问题.首先,构造了原问题的外部解和内层解.其次,研究了当激波在区间的边界附近和内部的激波解.最后,得出了与边界条件相对应的激波位置及解的表达式. 相似文献
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本文研究了一类四阶非线性奇摄动方程的边界层问题,利用在左右边界层的两次匹配,得出了原问题解的一致有效的渐近表达式.这个结果是奇摄动理论在研究高阶微分方程中的一个应用. 相似文献
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《数学物理学报(B辑英文版)》1999,19(5):589-597
This paper investigates the boundary value problems for a class of singularly perturbed nonlinear elliptic equations. By means of the theory of partial differential inequalities the author obtains the existence and asymptotic estimation of the solutions, involving the boundary and interior layer behavior, of the problems as described. 相似文献
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Michael Hanke 《Mathematische Nachrichten》1995,174(1):159-183
The present paper deals with quasilinear differential-algebraic equations with index 2. These equations are approximated by regularization methods. Such methods lead to singularly perturbed differential-algebraic equations. Using a geometric theory of singular perturbations convergence of the solutions of the regularized problems towards that of the index 2 problem is proved. The limits of the present theory are discussed and directions of future research are proposed. 相似文献
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唐荣荣 《Annals of Differential Equations》2004,20(3):278-282
In this paper, a class of strongly nonlinear singularly perturbed interior layer problems are considered by the theory of differential inequalities and the corrective theory of interior layer. The existence of solution is proved and the asymptotic behavior of solution for the boundary value problems are studied. And the satisfying result is obtained. 相似文献
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一类具有非整数幂的非线性奇异摄动内层问题 总被引:1,自引:0,他引:1
在适当的条件下,利用微分不等式以及内部层校正理论,研究了一类具有非整数幂的非线性奇异摄动内层问题.较简捷地证明了解的存在性,且对其解做出了估计,得出了其渐近解在[0,1]上的一致有效展开式. 相似文献