✦ LIBER ✦

Space and time localization for the estimation of distributed parameters in a finite element model

✍ Scribed by Fabio Marcuzzi

Publisher: Elsevier Science
Year: 2009
Tongue: English
Weight: 226 KB
Volume: 198
Category: Article
ISSN: 0045-7825
DOI: 10.1016/j.cma.2009.05.007

No coin nor oath required. For personal study only.

✦ Synopsis

In this paper we study the problem of estimating the possibly non-homogeneous material coefficients inside a physical system, from transient excitations and measurements made in a few points on the boundary. We assume there is available an adequate Finite Element (FEM) model of the system, whose distributed physical parameters must be estimated from the experimental data.

We propose a space-time localization approach that gives a better conditioned estimation problem, without the need of an expensive regularization. Some experimental results obtained on an elastic system with random coefficients are given.

📜 SIMILAR VOLUMES

Bayes shrinkage estimation of reliabilit

Bayes shrinkage estimation of reliability and the parameters of a finite range failure time model

✍ M. Pandey; V.P. Singh 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 237 KB

The use of residence time distribution d

The use of residence time distribution data for estimation of parameters in the axial dispersion model

✍ M.L. Michelsen; K. Østergaard 📂 Article 📅 1970 🏛 Elsevier Science 🌐 English ⚖ 603 KB

In this paper are presented four convenient methods for determination of the mean residence time and the axial dispersion coefficient of a flow system by analysis of data obtained by means of the imperfect tracer pulse method. The analysis is based upon numerical evaluation of the transfer function

A multilevel finite element method in sp

A multilevel finite element method in space-time for the Navier-Stokes problem

✍ Yinnian He; Kam-Moon Liu 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 221 KB 👁 1 views

A SPACE–TIME FINITE ELEMENT MODEL TO STU

A SPACE–TIME FINITE ELEMENT MODEL TO STUDY THE INFLUENCE OF INTERFACIAL KINETICS AND DIFFUSION ON CRYSTALLIZATION KINETICS

✍ K. M. KIT; J. M. SCHULTZ 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 480 KB 👁 2 views

We present a space-time ÿnite element formulation to study the cooperative growth of adjacent needlelike crystals in a two-dimensional, binary melt. It is assumed that the system is isothermal and that the compositions of the melt and the crystals are di erent. The growth rate of the crystals is tak

A posteriori error estimation for finite

A posteriori error estimation for finite element solutions of Helmholtz’ equation. part I: the quality of local indicators and estimators

✍ I. Babuška; F. Ihlenburg; T. Strouboulis; S. K. Gangaraj 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 271 KB 👁 3 views

This paper contains a first systematic analysis of a posteriori estimation for finite element solutions of the Helmholtz equation. In this first part, it is shown that the standard a posteriori estimates, based only on local computations, severely underestimate the exact error for the classes of wav

A 3D finite element method for the model

A 3D finite element method for the modelling of bounded and unbounded electromagnetic problems in the time domain

✍ W. P. Carpes Jr; L. Pichon; A. Razek 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 237 KB 👁 3 views

This paper presents a 3D body-conforming "nite element solution of the time-dependent vector wave equation. The method uses edge elements on tetrahedra for the electric "eld interpolation. This kind of element is suited to model Maxwell's equations since it only enforces tangential continuity of vec