Banca de DEFESA: Iago Freitas de Almeida

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Iago Freitas de Almeida
DATE: 16/01/2023
TIME: 14:00
LOCAL: Plataforma Teams
TITLE:

Surrogated models based on radial basis functions for quantifying uncertainty in nonlinear and time-dependent problems.

KEY WORDS:

Surrogated models, radial basis function, quantification of uncertainty, time-dependent problems, non-linearity.

PAGES: 160
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

This thesis proposes a strategy using radial basis function (RBF) as surrogate models for uncertainty quantification of non-linear and time-dependent problems. The models surrogates with RBF are trained to replace the time-consuming integral evaluations that determines the time-dependent energy release rate for a problem in energy mechanics. age- and time-dependent fracture. These surrogated templates are also used to replace the output responses of performance functions consisting of non-linear problems selected from the literature. The performance of models surrogated with RBF was validated through cross-validation and Monte Carlo simulations that exhaustively evaluate the integrals and the functions of non-linear and time-dependent problems. The results of quadratic errors means and Kolmogorov-Smirnov fit tests for probability and density functions predicted cumulative values, demonstrated that the models surrogated with RBF achieved good accuracy for small training sets. In addition, a new compact support RBF was introduced. for surrogate modeling processes. The results predicted by the models surrogated with the new RBF demonstrated a good efficiency for the presented problems of quantification of uncertainty of functions non-linear with relatively small training sets. The models surrogated with RBF presented generalization capabilities to predict thousands of unknown data obtained from Monte Carlo simulation and successfully evaluate fracture mechanics and function problems non-linear.

BANKING MEMBERS:
Interno - 2047809 - FRANCISCO EVANGELISTA JUNIOR
Externo ao Programa - 2126286 - ADRIANO TODOROVIC FABRO
Externo ao Programa - 1012696 - RAMON SALENO YURE RUBIM COSTA SILVA
Externo à Instituição - EDUARDO TOLEDO DE LIMA JÚNIOR - UFAL
Externo à Instituição - EVANDRO PARENTE JUNIOR - UFC