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考虑一个带非局部低阶项非线性抛物型方程的时间最优控制问题.首先利用Schauder不动点定理证明了系统的适定性,然后利用Carleman不等式和Kakutani不动点定理证明了容许控制和最优控制的存在性,并且建立了时间最优控制的最大值原理. 相似文献
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Li Daqian 《数学年刊B辑(英文版)》1982,3(4):527-544
在本文中,对某些高阶抛物型方程以及某些由抛物型方程所支配的系统的最优控制问题,我们证明了其解的一些极限形态。 相似文献
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针对污染和种内关系均影响细菌种群扩散这一管理生态学问题,本文建立了基于非线性拟抛物方程的最优控制模型,将外界环境向细菌种群输入的毒素率作为控制变量,运用控制理论和方法探讨污染和种内关系双重影响下种群扩散系统的最优控制问题。利用Schauder不动点定理证明了该种群扩散系统的适定性;同时,通过建立新的Carleman型估计,给出了容许控制和最优控制的存在性。最后,通过数值算例分析了理论推导的结果,在算例中都找到一对时间最优控制,验证了种群扩散系统最优控制模型的有效性。该研究结果对现代传染病预防具有借鉴意义,也为有效控制瘟疫的爆发和流行提供理论参考。 相似文献
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赵宝元 《高校应用数学学报(A辑)》1990,5(2):256-266
本文研究了气-固反应中的一个边界最优控制问题。反应的质量守恒方程为非线性抛物方程组,目标函数为一定时间内输入的气体量。通过控制外界气体浓度,使反应在某固定时刻完成,并且输入气体量最小。我们讨论了方程的可解性,得到了最优控制的存在性,并建立了最优控制的一个逼近结果。 相似文献
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研究一类强非线性发展方程的周期解及相应的最优控制问题的存在性,首先,证明了Banach空间中一类包含非线性单调算子和非线性非单调扰动的强非线性发展方程周期解的存在性;其次,给出了保证相应的Lagrange最优控制的充分条件;最后,举例说明理论结果在拟线笥抛物方程周期问题及相应的最优控制问题中的应用。 相似文献
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We study the optimal control problem for a class of elliptic problems that may possess multiple solutions. We obtain necessary conditions for optimal control by constructing a related parabolic problem and using known results for the parabolic problem. 相似文献
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Elliptic reconstruction and a posteriori error estimates for parabolic optimal control problems 下载免费PDF全文
In this article, a semidiscrete finite element method for parabolic optimal control problems is investigate. By using elliptic reconstruction, a posteriori error estimates for finite element discretizations of optimal control problem governed by parabolic equations with integral constraints are derived. 相似文献
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The main focus of this paper is on an a-posteriori analysis for the method of proper orthogonal decomposition (POD) applied
to optimal control problems governed by parabolic and elliptic PDEs. Based on a perturbation method it is deduced how far
the suboptimal control, computed on the basis of the POD model, is from the (unknown) exact one. Numerical examples illustrate
the realization of the proposed approach for linear-quadratic problems governed by parabolic and elliptic partial differential
equations. 相似文献
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Hans D. Mittelmann 《Computational Optimization and Applications》2001,20(1):93-110
We study optimal control problems for semilinear parabolic equations subject to control constraints and for semilinear elliptic equations subject to control and state constraints. We quote known second-order sufficient optimality conditions (SSC) from the literature. Both problem classes, the parabolic one with boundary control and the elliptic one with boundary or distributed control, are discretized by a finite difference method. The discrete SSC are stated and numerically verified in all cases providing an indication of optimality where only necessary conditions had been studied before. 相似文献
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Karl-Heinz Hoffmann Masahiro Kubo 《Numerical Functional Analysis & Optimization》2013,34(3-4):329-356
In this paper, we study optimal control problems for quasi-linear elliptic–parabolic variational inequalities with time-dependent constraints. We prove the existence of an optimal control that minimizes the nonlinear cost functional. Moreover, we apply our general results to some model problems. In particular, we show the necessary condition of optimal pair for a problem of partial differential equation (PDE) with a non-homogeneous Dirichlet boundary condition. 相似文献
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H. W. Lou 《Journal of Optimization Theory and Applications》2005,125(2):367-391
Some new results on the existence of optimal controls are established for control systems governed by semilinear elliptic or parabolic equations. No Cesari type conditions are assumed. By proving existence theorems and analyzing the Pontryagin maximum principle for optimal relaxed state-control pairs for the corresponding relaxed problems, existence theorems of classical optimal pairs for the original problem are established. To treat the case of a noncompact control set, relaxed controls defined by finitely additive measures are used. 相似文献
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B. Bialecki M. Ganesh K. Mustapha 《Numerical Methods for Partial Differential Equations》2009,25(5):1129-1148
We propose and analyze a fully discrete Laplace modified alternating direction implicit quadrature Petrov–Galerkin (ADI‐QPG) method for solving parabolic initial‐boundary value problems on rectangular domains. We prove optimal order convergence results for a restricted class of the associated elliptic operator and demonstrate accuracy of our scheme with numerical experiments for some parabolic problems with variable coefficients.© 2008 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2009 相似文献
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A Smooth Regularization of the Projection Formula for Constrained Parabolic Optimal Control Problems
Ira Neitzel Uwe Prüfert Thomas Slawig 《Numerical Functional Analysis & Optimization》2013,34(12):1283-1315
We present a smooth, that is, differentiable regularization of the projection formula that occurs in constrained parabolic optimal control problems. We summarize the optimality conditions in function spaces for unconstrained and control-constrained problems subject to a class of parabolic partial differential equations. The optimality conditions are then given by coupled systems of parabolic PDEs. For constrained problems, a non-smooth projection operator occurs in the optimality conditions. For this projection operator, we present in detail a regularization method based on smoothed sign, minimum and maximum functions. For all three cases, that is, (1) the unconstrained problem, (2) the constrained problem including the projection, and (3) the regularized projection, we verify that the optimality conditions can be equivalently expressed by an elliptic boundary value problem in the space-time domain. For this problem and all three cases we discuss existence and uniqueness issues. Motivated by this elliptic problem, we use a simultaneous space-time discretization for numerical tests. Here, we show how a standard finite element software environment allows to solve the problem and, thus, to verify the applicability of this approach without much implementation effort. We present numerical results for an example problem. 相似文献
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We present an iterative domain decomposition method for the optimal control of systems governed by linear partial differential equations. The equations can be of elliptic, parabolic, or hyperbolic type. The space region supporting the partial differential equations is decomposed and the original global optimal control problem is reduced to a sequence of similar local optimal control problems set on the subdomains. The local problems communicate through transmission conditions, which take the form of carefully chosen boundary conditions on the interfaces between the subdomains. This domain decomposition method can be combined with any suitable numerical procedure to solve the local optimal control problems. We remark that it offers a good potential for using feedback laws (synthesis) in the case of time-dependent partial differential equations. A test problem for the wave equation is solved using this combination of synthesis and domain decomposition methods. Numerical results are presented and discussed. Details on discretization and implementation can be found in Ref. 1. 相似文献
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In this paper we investigate a space-time finite element approximation of parabolic optimal control problems. The first order optimality conditions are transformed into an elliptic equation of fourth order in space and second order in time involving only the state or the adjoint state in the space-time domain. We derive a priori and a posteriori error estimates for the time discretization of the state and the adjoint state. (© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献