Geodesic
Zero-Order Asymptotics for the Solution of One Type of Singularly Perturbed Linear--Quadratic Control Problems in the Critical Case
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 29 (2023) no. 1, pp. 127-142

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We consider a linear–quadratic control problem in which there is the second power of a small parameter at the derivative of the state variable and the first power of the parameter both in the control term of the state equation and at the quadratic form with respect to the control variable in the performance index; moreover, the state equation represents a critical case of singular perturbation theory. A zero-order asymptotic expansion of the solution is constructed using the so-called direct scheme method in which a postulated asymptotic expansion of the solution is substituted directly into the problem statement and problems for finding the asymptotic terms are stated.
Keywords: linear–quadratic control problem, critical case, asymptotics of solution.
Mots-clés : singular perturbations 
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     author = {G. A. Kurina and N. T. Hoai},
     title = {Zero-Order {Asymptotics} for the {Solution} of {One} {Type} of {Singularly} {Perturbed} {Linear--Quadratic} {Control} {Problems} in the {Critical} {Case}},
     journal = {Trudy Instituta matematiki i mehaniki},
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G. A. Kurina; N. T. Hoai. Zero-Order Asymptotics for the Solution of One Type of Singularly Perturbed Linear--Quadratic Control Problems in the Critical Case. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 29 (2023) no. 1, pp. 127-142. http://geodesic.mathdoc.fr/item/TIMM_2023_29_1_a9/