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Constructive exact control of semilinear 1D heat equations 半线性一维热方程的构造精确控制
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-03-17 DOI: 10.3934/mcrf.2022001
Jérôme Lemoine, A. Munch

The exact distributed controllability of the semilinear heat equation begin{document}$ partial_{t}y-Delta y + g(y) = f ,1_{omega} $end{document} posed over multi-dimensional and bounded domains, assuming that begin{document}$ gin C^1(mathbb{R}) $end{document} satisfies the growth condition begin{document}$ limsup_{rto infty} g(r)/ (vert rvert ln^{3/2}vert rvert) = 0 $end{document} has been obtained by Fernández-Cara and Zuazua in 2000. The proof based on a non constructive fixed point arguments makes use of precise estimates of the observability constant for a linearized heat equation. In the one dimensional setting, assuming that begin{document}$ g^prime $end{document} does not grow faster than begin{document}$ beta ln^{3/2}vert rvert $end{document} at infinity for begin{document}$ beta>0 $end{document} small enough and that begin{document}$ g^prime $end{document} is uniformly Hölder continuous on begin{document}$ mathbb{R} $end{document} with exponent begin{document}$ pin [0,1] $end{document}, we design a constructive proof yielding an explicit sequence converging to a controlled solution for the semilinear equation, at least with order begin{document}$ 1+p $end{document} after a finite number of iterations.

The exact distributed controllability of the semilinear heat equation begin{document}$ partial_{t}y-Delta y + g(y) = f ,1_{omega} $end{document} posed over multi-dimensional and bounded domains, assuming that begin{document}$ gin C^1(mathbb{R}) $end{document} satisfies the growth condition begin{document}$ limsup_{rto infty} g(r)/ (vert rvert ln^{3/2}vert rvert) = 0 $end{document} has been obtained by Fernández-Cara and Zuazua in 2000. The proof based on a non constructive fixed point arguments makes use of precise estimates of the observability constant for a linearized heat equation. In the one dimensional setting, assuming that begin{document}$ g^prime $end{document} does not grow faster than begin{document}$ beta ln^{3/2}vert rvert $end{document} at infinity for begin{document}$ beta>0 $end{document} small enough and that begin{document}$ g^prime $end{document} is uniformly Hölder continuous on begin{document}$ mathbb{R} $end{document} with exponent begin{document}$ pin [0,1] $end{document}, we design a constructive proof yielding an explicit sequence converging to a controlled solution for the semilinear equation, at least with order begin{document}$ 1+p $end{document} after a finite number of iterations.
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引用次数: 6
Control theory approach to continuous-time finite state mean field games 连续时间有限状态平均场对策的控制理论研究
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-03-12 DOI: 10.3934/mcrf.2022029
Y. Averboukh
In the paper, we study the dependence of solutions of the continuous-time finite state mean field game on initial distribution of players. Our approach relies on the concept of value multifunction of the mean field game that is a mapping assigning to an initial time and an initial distribution a set of expected outcomes of the representative player corresponding to solutions of the mean field game. Using the reformulation of the finite state mean field game as a control problem with mixed constraints, we give the sufficient condition on a given multifunction to be a value multifunction in the terms of the viability theory. The maximal multifunction (i.e., the mapping assigning to an initial time and an initial distribution the whole set of values corresponding to solutions of the mean field game) is characterized via the backward attainability set for the certain control system.
本文研究了连续时间有限状态平均场对策的解与参与人初始分布的依赖关系。我们的方法依赖于平均场博弈的价值多功能概念,这是一个映射,分配给初始时间和初始分布,即与平均场博弈的解相对应的代表性参与者的一组预期结果。利用有限状态平均场对策作为混合约束控制问题的重新表述,利用生存理论给出了给定多函数是值多函数的充分条件。通过对某控制系统的后向可达性集刻画了最大多函数(即分配给平均场对策解的全部值的初始时间和初始分布的映射)。
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引用次数: 1
On the relation between turnpike properties and dissipativity for continuous time linear quadratic optimal control problems 连续时间线性二次最优控制问题收费公路性质与耗散率的关系
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-03-01 DOI: 10.3934/MCRF.2020032
L. Grüne, Roberto Guglielmi
The paper is devoted to analyze the connection between turnpike phenomena and strict dissipativity properties for continuous-time finite dimensional linear quadratic optimal control problems. We characterize strict dissipativity properties of the dynamics in terms of the system matrices related to the linear quadratic problem. These characterizations then lead to new necessary conditions for the turnpike properties under consideration, and thus eventually to necessary and sufficient conditions in terms of spectral criteria and matrix inequalities. One of the key novelty of these results is the possibility to encompass the presence of state and input constraints.
本文研究了连续时间有限维线性二次最优控制问题中收费公路现象与严格耗散性之间的关系。我们用与线性二次问题相关的系统矩阵来描述动力学的严格耗散性质。这些表征然后导致考虑的收费公路性质的新的必要条件,从而最终得到谱准则和矩阵不等式方面的必要和充分条件。这些结果的一个关键新颖之处在于可以包含状态和输入约束的存在。
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引用次数: 24
Linear-quadratic-Gaussian mean-field-game with partial observation and common noise 具有局部观测和共噪声的线性二次高斯平均场博弈
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-03-01 DOI: 10.3934/mcrf.2020025
A. Bensoussan, Xinwei Feng, Jianhui Huang
This paper considers a class of linear-quadratic-Gaussian (LQG) mean-field games (MFGs) with partial observation structure for individual agents. Unlike other literature, there are some special features in our formulation. First, the individual state is driven by some common-noise due to the external factor and the state-average thus becomes a random process instead of a deterministic quantity. Second, the sensor function of individual observation depends on state-average thus the agents are coupled in triple manner: not only in their states and cost functionals, but also through their observation mechanism. The decentralized strategies for individual agents are derived by the Kalman filtering and separation principle. The consistency condition is obtained which is equivalent to the wellposedness of some forward-backward stochastic differential equation (FBSDE) driven by common noise. Finally, the related begin{document}$ epsilon $end{document} -Nash equilibrium property is verified.
This paper considers a class of linear-quadratic-Gaussian (LQG) mean-field games (MFGs) with partial observation structure for individual agents. Unlike other literature, there are some special features in our formulation. First, the individual state is driven by some common-noise due to the external factor and the state-average thus becomes a random process instead of a deterministic quantity. Second, the sensor function of individual observation depends on state-average thus the agents are coupled in triple manner: not only in their states and cost functionals, but also through their observation mechanism. The decentralized strategies for individual agents are derived by the Kalman filtering and separation principle. The consistency condition is obtained which is equivalent to the wellposedness of some forward-backward stochastic differential equation (FBSDE) driven by common noise. Finally, the related begin{document}$ epsilon $end{document} -Nash equilibrium property is verified.
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引用次数: 7
Performance estimates for economic model predictive control and their application in proper orthogonal decomposition-based implementations 经济模型预测控制的性能估计及其在适当的正交分解实现中的应用
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-03-01 DOI: 10.3934/MCRF.2021013
L. Grüne, L. Mechelli, S. Pirkelmann, S. Volkwein
In this paper performance indices for economic model predictive controllers (MPC) are considered. Since existing relative performance measures, designed for stabilizing controllers, fail in the economic setting, we propose alternative absolute quantities. We show that these can be applied to assess the performance of the closed loop trajectories on-line while the controller is running. The advantages of our approach are demonstrated by simulations involving a convection-diffusion-system. The method is also combined with proper orthogonal decomposition, thus demonstrating the possibility for both efficient and performant MPC for systems governed by partial differential equations.
研究了经济模型预测控制器(MPC)的性能指标。由于为稳定控制器而设计的现有相对性能度量在经济设置中失败,我们提出了替代的绝对数量。我们表明,这些可以应用于在线评估闭环轨迹的性能,而控制器正在运行。通过对流扩散系统的模拟,证明了该方法的优点。该方法还与适当的正交分解相结合,从而证明了对偏微分方程控制的系统进行高效和高性能MPC的可能性。
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引用次数: 5
On the asymptotic stability of the Korteweg-de Vries equation with time-delayed internal feedback 具有时滞内反馈的Korteweg-de Vries方程的渐近稳定性
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-02-09 DOI: 10.3934/mcrf.2021039
J. Valein
The aim of this work is to study the asymptotic stability of the nonlinear Korteweg-de Vries equation in the presence of a delayed term in the internal feedback. We first consider the case where the weight of the term with delay is smaller than the weight of the term without delay and we prove a semiglobal stability result for any lengths. Secondly we study the case where the support of the term without delay is not included in the support of the term with delay. In that case, we give a local exponential stability result if the weight of the delayed term is small enough. We illustrate these results by some numerical simulations.
本文的目的是研究非线性Korteweg-de Vries方程在内部反馈中存在时滞项时的渐近稳定性。我们首先考虑有延迟项的权值小于无延迟项的权值的情况,并证明了任意长度的半全局稳定性结果。其次,我们研究了无迟延条款的支持不包括在有迟延条款的支持中的情况。在这种情况下,如果延迟项的权重足够小,我们给出了一个局部指数稳定性的结果。我们通过一些数值模拟来说明这些结果。
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引用次数: 10
A concise introduction to control theory for stochastic partial differential equations 随机偏微分方程控制理论的简明介绍
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-01-26 DOI: 10.3934/MCRF.2021020
Qi Lu, Xu Zhang
The aim of this notes is to give a concise introduction to control theory for systems governed by stochastic partial differential equations. We shall mainly focus on controllability and optimal control problems for these systems. For the first one, we present results for the exact controllability of stochastic transport equations, null and approximate controllability of stochastic parabolic equations and lack of exact controllability of stochastic hyperbolic equations. For the second one, we first introduce the stochastic linear quadratic optimal control problems and then the Pontryagin type maximum principle for general optimal control problems. It deserves mentioning that, in order to solve some difficult problems in this field, one has to develop new tools, say, the stochastic transposition method introduced in our previous works.
本讲义的目的是对随机偏微分方程控制系统的控制理论作一个简明的介绍。我们将主要关注这些系统的可控性和最优控制问题。对于第一个问题,我们给出了随机输运方程的精确可控性、随机抛物方程的零可控性和近似可控性以及随机双曲方程的缺乏精确可控性的结果。对于随机线性二次最优控制问题,我们首先介绍了随机线性二次最优控制问题,然后介绍了一般最优控制问题的庞特里亚金型极大值原理。值得一提的是,为了解决这一领域的一些难题,人们不得不开发新的工具,比如我们之前的工作中介绍的随机换位法。
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引用次数: 6
Eigenvalues of stochastic Hamiltonian systems with boundary conditions and its application 具有边界条件的随机哈密顿系统的特征值及其应用
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-01-03 DOI: 10.3934/mcrf.2021055
Guangdong Jing, Penghui Wang

In this paper we solve the eigenvalue problem of stochastic Hamiltonian system with boundary conditions. Firstly, we extend the results in Peng [12] from time-invariant case to time-dependent case, proving the existence of a series of eigenvalues begin{document}$ {lambda_m} $end{document} and construct corresponding eigenfunctions. Moreover, the order of growth for these begin{document}$ {lambda_m} $end{document} are obtained: begin{document}$ lambda_msim m^2 $end{document}, as begin{document}$ mrightarrow +infty $end{document}. As applications, we give an explicit estimation formula about the statistic period of solutions of Forward-Backward SDEs. Besides, by a meticulous example we show the subtle situation in time-dependent case that some eigenvalues appear when the solution of the associated Riccati equation does not blow-up, which does not happen in time-invariant case.

In this paper we solve the eigenvalue problem of stochastic Hamiltonian system with boundary conditions. Firstly, we extend the results in Peng [12] from time-invariant case to time-dependent case, proving the existence of a series of eigenvalues begin{document}$ {lambda_m} $end{document} and construct corresponding eigenfunctions. Moreover, the order of growth for these begin{document}$ {lambda_m} $end{document} are obtained: begin{document}$ lambda_msim m^2 $end{document}, as begin{document}$ mrightarrow +infty $end{document}. As applications, we give an explicit estimation formula about the statistic period of solutions of Forward-Backward SDEs. Besides, by a meticulous example we show the subtle situation in time-dependent case that some eigenvalues appear when the solution of the associated Riccati equation does not blow-up, which does not happen in time-invariant case.
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引用次数: 0
General stability of abstract thermoelastic system with infinite memory and delay 具有无限记忆和延迟的抽象热弹性系统的一般稳定性
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-01-01 DOI: 10.3934/mcrf.2020040
Jianghao Hao, Junna Zhang
In this paper we study an abstract thermoelastic system in Hilbert space with infinite memory and time delay. Under some suitable conditions, we prove the well-posedness by invoking semigroup theory. Since the damping may stabilize the system while the delay may destabilize it, we discuss the interaction between the damping and the delay term, and obtain that the system is uniformly stable when the effect of damping is greater than that of time delay. By establishing suitable Lyapunov functionals which are equivalent to the energy of system we also establish the general energy decay results for abstract thermoelastic system.
本文研究了Hilbert空间中具有无限记忆和时滞的抽象热弹性系统。在一些合适的条件下,利用半群理论证明了该方法的适定性。由于阻尼可以使系统稳定,而时滞可以使系统失稳,因此讨论了阻尼与时滞项的相互作用,得到了当阻尼的作用大于时滞的作用时系统是均匀稳定的。通过建立与系统能量等效的合适的Lyapunov泛函,我们还建立了抽象热弹性系统的一般能量衰减结果。
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引用次数: 2
Modeling the pressure distribution in a spatially averaged cerebral capillary network 模拟空间平均脑毛细血管网络的压力分布
IF 1.2 4区 数学 Q2 Mathematics Pub Date : 2021-01-01 DOI: 10.3934/MCRF.2021016
A. Kovtanyuk, A. Chebotarev, N. Botkin, V. Turova, I. Sidorenko, R. Lampe
. A boundary value problem for the Poisson’s equation with unknown intensities of sources is studied in context of mathematical modeling the pressure distribution in cerebral capillary networks. The problem is formulated as an inverse problem with finite-dimensional overdetermination. The unique solvability of the problem is proven. A numerical algorithm is proposed and implemented.
. 在对脑毛细血管网络压力分布进行数学建模的基础上,研究了未知源强度泊松方程的边值问题。该问题被表述为具有有限维超定的反问题。证明了该问题的唯一可解性。提出并实现了一种数值算法。
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引用次数: 2
期刊
Mathematical Control and Related Fields
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