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利用一阶拟线性双曲组混合初边值问题的精确能控性理论,通过对边界速度或压强的控制,实现了一维绝热流方程组的精确边界能控性. 相似文献
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拟线性双曲型方程组具较少控制函数的双侧精确边界能控性 总被引:1,自引:0,他引:1
张祺 《高校应用数学学报(A辑)》2009,24(1)
研究具有一般非线性边界条件的一阶拟线性双曲型方程组的具有较少控制函数的双侧精确边界能控性.在正负特征数不相等的情况下,以一阶拟线性双曲型方程组混合初边值问题的半整体C1解理论为基础,采用一个直接的构造方法,使用较少的边界控制函数实现了局部双侧精确边界能控性,并且对精确控制时间给出了最佳估计. 相似文献
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本文讨论非线性项带一个极大单调图的半线性抛物型方程系统的零能控性.文中利用Kakutani不动点定理和线性抛物型方程的能控性得到该系统是零能控的,如果控制作用在内部区域上.由此,还得到该系统是零能控的,如果控制施加在一部分边界上. 相似文献
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本文研究了具有非局部项的热方程的能控性问题.利用对偶原理和反证法,获得当系统施加双线性控制时,具有非局部项的热方程不是零能控的.推广了受控系统不能边界零能控的结果. 相似文献
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探究一类具有年龄等级结构的种群模型的边界调控问题,包括系统的能控性和最优控制.应用特征线方法和Gronwall不等式建立状态分布关于控制变量的连续依赖性;基于线性系统的能控性与集值映射不动点方法获得了非线性种群系统的近似能控性;运用Ekeland变分原理证明了最优策略的存在唯一性,构造适当的共轭系统和法向量对最优策略作出精细刻画.数值模拟结果展示了控制策略的可行性. 相似文献
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This paper deals with an isoperimetric optimal control problem for nonlinear control-affine systems with periodic boundary conditions. As it was shown previously, the candidates for optimal controls for this problem can be obtained within the class of bang-bang input functions. We consider a parametrization of these inputs in terms of switching times. The control-affine system under consideration is transformed into a driftless system by assuming that the controls possess properties of a partition of unity. Then the problem of constructing periodic trajectories is studied analytically by applying the Fliess series expansion over a small time horizon. We propose analytical results concerning the relation between the boundary conditions and switching parameters for an arbitrary number of switchings. These analytical results are applied to a mathematical model of non-isothermal chemical reactions. It is shown that the proposed control strategies can be exploited to improve the reaction performance in comparison to the steady-state operation mode. 相似文献
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On motions and switchability in a periodically forced,discontinuous system with a parabolic boundary
The analytical conditions for motion switchability on the switching boundary in a periodically forced, discontinuous system are developed through the G-function of the vector fields to the switching boundary. Periodic motions in such a discontinuous dynamical system are discussed by the use of mapping structures. Two periodic motions and the analytical conditions are presented for illustration. Further investigation should be carried out for a better understanding of the vanishing and stability of regular and chaotic motions. 相似文献
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This work develops near-optimal controls for systems given by differential equations with wideband noise and random switching. The random switching is modeled by a continuous-time, time-inhomogeneous Markov chain. Under broad conditions, it is shown that there is an associated limit problem, which is a switching jump diffusion. Using near-optimal controls of the limit system, we then build controls for the original systems. It is shown that such constructed controls are nearly optimal. 相似文献
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Albert C.J. Luo Brandon M. Rapp 《Communications in Nonlinear Science & Numerical Simulation》2010,15(1):86-98
In this paper, sliding and transversal motions on the boundary in the periodically driven, discontinuous dynamical system is investigated. The simple inclined straight line boundary in phase space is considered as a control law for such a dynamical system to switch. The normal vector field for a flow switching on the separation boundary is adopted to develop the analytical conditions, and the corresponding transversality conditions of a flow to the boundary are obtained. The conditions of sliding and grazing flows to the separation boundary are presented as well. Using mapping structures, periodic motions of such a discontinuous system are predicted, and the corresponding local stability and bifurcation analysis of the periodic motion are carried out. Numerical illustrations of periodic motions with and without sliding on the boundary are given. The local stability analysis cannot provide the proper prediction of the sliding and grazing motions in discontinuous dynamical systems. Therefore, the normal vector fields of periodic flows are presented, and the normal vector fields on the switching boundary points give the analytical criteria for sliding and transversality of motions. 相似文献
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A class of one-dimensional parabolic optimal boundary control problems is considered. The discussion includes Neumann, Robin,
and Dirichlet boundary conditions. The reachability of a given target state in final time is discussed under box constraints
on the control. As a mathematical tool, related exponential moment problems are investigated. Moreover, based on a detailed
study of the adjoint state, a technique is presented to find the location and the number of the switching points of optimal
bang-bang controls. Numerical examples illustrate this procedure. 相似文献
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A two-person zero-sum infinite dimensional differential game of infinite duration with discounted payoff involving hybrid
controls is studied. The minimizing player is allowed to take continuous, switching and impulse controls whereas the maximizing
player is allowed to take continuous and switching controls. By taking strategies in the sense of Elliott-Kalton, we prove
the existence of value and characterize it as the unique viscosity solution of the associated system of quasi-variational
inequalities. 相似文献
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《Nonlinear Analysis: Theory, Methods & Applications》2005,63(1):23-41
A two-person zero-sum differential game of infinite duration with discounted payoff involving hybrid controls is studied. The minimizing player is allowed to take continuous, switching, and impulse controls whereas the maximizing player is allowed to take continuous and switching controls. By taking strategies in the sense of Elliott–Kalton, we prove the existence of value and characterize it as the unique viscosity solution of the associated system of quasi-variational inequalities. 相似文献
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We consider a spatially distributed hybrid system consisting of a convection/reaction system in which the reaction switches discontinuously in time between modes, independently at each spatial point on reaching “switching thresholds”. The model involves a novel formulation for evolution of the free boundary between the modal regions. 相似文献
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《Communications in Nonlinear Science & Numerical Simulation》2007,12(1):100-116
In paper, the sliding dynamics on the separation boundary is discussed based on the set-valued vector field theory. From vector fields in the neighborhood of a specific separation boundary, the passability of the flow from the one domain into another one is further discussed. The switching bifurcation conditions from the passable boundary to the non-passable boundary are developed. The sliding flow fragmentation on the separation boundary surface is also presented. The normal vector product field function is introduced to determine the switching bifurcation and sliding fragmentation. 相似文献
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From phenomena of synchronization to exact synchronization and approximate synchronization for hyperbolic systems 总被引:1,自引:0,他引:1
TaTsien Li 《中国科学 数学(英文版)》2016,59(1):1-18
In this survey paper, the synchronization will be initially studied for infinite dimensional dynamical systems of partial differential equations instead of finite dimensional systems of ordinary differential equations,and will be connected with the control theory via boundary controls in a finite time interval. More precisely,various kinds of exact boundary synchronization and approximate boundary synchronization will be introduced and realized by means of fewer boundary controls for a coupled system of wave equations with Dirichlet boundary controls. Moreover, as necessary conditions for various kinds of approximate boundary synchronization, criteria of Kalman's type are obtained. Finally, some prospects will be given. 相似文献