2019-01-17T15:41:08Z
http://oa.upm.es/cgi/oai2
oai:oa.upm.es:2924
2016-04-20T12:32:56Z
7374617475733D707562
7375626A656374733D6D6174656D617469636173
747970653D61727469636C65
An alternating descent method for the optimal control of the inviscid Burgers equation in the presence of shocks.
Castro Barbero, Carlos Manuel
Palacios, Francisco
Zuazua Iriondo, Enrique
Matemáticas
We introduce a new optimization strategy to compute numerical approximations of minimizers for optimal control problems governed by scalar conservation laws in the presence of shocks. We focus on the 1 − d inviscid Burgers equation. We first prove the existence of minimizers and, by a -convergence argument, the convergence of discrete minima obtained by means of numerical approximation schemes satisfying the so called onesided Lipschitz condition (OSLC). Then we address the problem of developing efficient descent algorithms. We first consider and compare the existing two possible approaches: the so-called discrete approach, based on a direct computation of gradients in the discrete problem and the so-called continuous one, where the discrete descent direction is obtained as a discrete copy of the continuous one. When optimal solutions have shock discontinuities, both approaches produce highly oscillating minimizing sequences and the effective descent rate is very weak. As a solution we propose a new method, that we shall call alternating descent method, that uses the recent developments of generalized tangent vectors and the linearization around discontinuous solutions. This method distinguishes and alternates the descent directions that move the shock and those that perturb the profile of the solution away of it producing very efficient and fast descent algorithms.
E.T.S.I. Caminos, Canales y Puertos (UPM)
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
2008-03
info:eu-repo/semantics/article
Artículo
Mathematical Models & Methods in Applied Sciences, ISSN 0218-2025, 2008-03, Vol. 18, No. 3
PeerReviewed
application/pdf
eng
http://www.worldscinet.com/m3as/18/1803/S02182025081803.html
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/altIdentifier/doi/10.1142/S0218202508002723
http://oa.upm.es/2924/