关于非线性过程最优控制的存在性问题
The Existence Problem of Optimal Control for Nonlinear Processes
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摘要: 本文讨论了形为x=f(t,x,u)的系统的最优控制的存在性问题,f(f,x,u)是比较一般的非线性函数,控制类普遍到足以包含一般工程上常见的控制函数.还讨论了由属于一定函数类的控制函数序列去逼近最优控制的问题,举出了与文[1]结论相矛盾的反例,并导出这问题的正确结论.Abstract: The existence problem of optimal control systems described by x=f(t,x,u) is discussed in this paper, where f(t.x,u) is a more general function and the class of admissible control functions are general enough to contain those control functions which are frequently used in engineering. The problem for an optimal control approximated by a sequence of control functions being part of certain function classes is considered here, an example in contradiction with the conclusion of ref. [1] about this problem is given, and a correct conclusion is presented.
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[1] Lee,E.B.and L.Markus,Optimal control for nonlinear processes,Arch.Rational Mech.Anal.,Vol.8,No.1,(1961),36-38. [2] Berkovitz,L.D.,Optimal Control Theory,(1974). [3] 夏道行等.《实变函数论与泛函分析》人民教育出版社.(1979). [4] 刘斯铁尔尼克,Л.Е.等,《泛函分析概要》中译本,杨从仁译.科学出版社.
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