Global optimization numerical strategies for rate-independent processes

0347609 - ÚT 2012 RIV NL eng J - Článek v odborném periodiku
Benešová, Barbora
Global optimization numerical strategies for rate-independent processes.
Journal of Global Optimization. Roč. 50, č. 2 (2011), s. 197-220. ISSN 0925-5001. E-ISSN 1573-2916
Grant CEP: GA ČR GAP201/10/0357
Grant ostatní: GA MŠk(CZ) LC06052
Program: LC
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: rate-independent processes * numerical global optimization * energy estimates based algorithm
Kód oboru RIV: BA - Obecná matematika
Impakt faktor: 1.196, rok: 2011
http://math.hnue.edu.vn/portal/rss.viewpage.php?id=0000037780&ap=L3BvcnRhbC9ncmFiYmVyLnBocD9jYXRpZD0xMDEyJnBhZ2U9Mg==

This paper presents an approach to numerical solution of problems posed in the framework of quasi-static rate-independent processes. As soon as a problem allows for an energetic formulation there are known methods of its time discretization by time incremental minimization problems, which demand for global optimization of a non-convex functional. Moreover the two-sided energy inequality, a necessary condition for optimization, can be formulated. Here we present an algorithm for finding solutions of rate-independent processes that verifies this condition and uses the strategy of backtracking if it is violated. We present the selectivity of the mentioned necessary condition in general and give numerical examples of the efficiency of such an algorithm, but also of situations that are beyond its limits. For those we propose a second strategy relying on wisely chosen combinations of spatial discretizations.
Trvalý link: http://hdl.handle.net/11104/0188356