Optimal feedback controls in deterministic two-machine flowshopswith finite buffers
Ngo Tai Fong; Xun Yu Zhou
Automatic Control, IEEE Transactions on
Volume 45, Issue 6, Jun 2000 Page(s):1198 - 1203
Digital Object Identifier 10.1109/9.863606
Summary:This paper deals with an optimal control problem of deterministic
two-machine flowshops. Since the sizes of both internal and external
buffers are practically finite, the problem is one with state
constraints. The Hamilton-Jacobi-Bellman (HJB) equations of the problem
involve complicated boundary conditions due to the presence of the state
constraints, and as a consequence the usual “verification
theorem” may not work for the problem. To overcome this
difficulty, it is shown that any function satisfying the HJB equations
in the interior of the state constraint domain must be majorized by the
value function. The main techniques employed are the “constraint
domain approximation” approach and the
“weak-Lipschitz” property of the value functions developed
in preceding papers. Based on this, an explicit optimal feedback control
for the problem is obtained
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