Ulbin, M. - Search Results - Digital Repository

guest :: login Digital Repository
		Search		Submit		Help		About

Home > Search Results: Ulbin, M.

Search:

Search Tips :: Advanced Search

Search collections:

Sort by:	Display results:	Output format:

	Finite element contact-impact algorithm in explicit transient analysis Gabriel, Dušan ; Kopačka, Ján ; Plešek, Jiří ; Ulbin, M. This work addresses three issues in computational modelling of contact-impact problems: i) overviews a contact algorithm proposed by these authors, ii) local search treatment based on the modification of the Nelder-Mead simplex method, iii) discusses an algorithmic aspects of contact algorithm in conjunction with the explicit time integration scheme. The talk closes with the presentation of several numerical examples including the longitudinal impact of two thick plates, for which analytical solution is available. Detailed record
	Application of Methods for Unconstrained Optimization in Computation of Normal Contact Vector Kopačka, Ján ; Gabriel, Dušan ; Plešek, Jiří ; Ulbin, M. The stability of the contact algorithm using the penalty method is significantly affected by choosing of the penalty function. The penalty function is defined like a magnitude of the penetration vector multiplied by the users-defined constant - the penalty parameter. The penetration vector is obtained by solution of the minimum distance problem between the node/Gaussian integration point and the segment of the element. For a general quadrilateral contact segment this task leads to the system of two nonlinear equations. It is shown that the popular Newton-Raphson method is inadvisable for this problem. In this paper, alternative methods like quasi-Newton methods, gradient methods and the simplex method are presented. Especial attention is put on the line-search method that is crucial for a general success of quasi-Newton methods as well as gradient methods. All mentioned methods are tested by means of numerical example, which involves bending of two rectangular plates over a cylinder. Detailed record
	Two Plates impact Problem for Testing Accuracy and Stability of Finite Element Solutions to Wave Propagation Gabriel, Dušan ; Plešek, Jiří ; Kolman, Radek ; Valeš, František ; Ulbin, M. The verification of comprehensive study of dispersion properties of two-dimensional bilinear and quadratic serendipity elements in transient elastodynamics on two impact plates problem was performed. Detailed record

Interested in being notified about new results for this query?
Subscribe to the RSS feed.

Digital Repository :: :: :: ::
Powered by v1.1.2
Maintained by

This site is also available in the following languages:
Česky English