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Improving Mixed Variable Optimization of Computational and Model Parameters Using Multiple Surrogate Functions

Name: Improving Mixed Variable Optimization of Computational and Model Parameters Using Multiple Surrogate Functions
Brand: Biblioscholar
SKU: 9781288311422
Price: 17.85 EUR
Availability: InStock

Autor: David Bethea

Jazyk:

Väzba: Brožovaná

Vydavateľ: Biblioscholar

Dostupnosť: Skladom u dodávateľa

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17.85 €

This research focuses on reducing computational time in parameter optimization by using multiple sur...

Informácie o knihe

Autor

David Bethea

Jazyk

Angličtina

Väzba

Kniha - Brožovaná

Vydalo

2012

Stránok

158

EAN

9781288311422

ISBN

9781288311422

Enbook ID

08242931

Vydavateľ

Biblioscholar

Hmotnosť

295

Rozmery

189 x 246 x 9

Kompletný popis

This research focuses on reducing computational time in parameter optimization by using multiple surrogates and subprocess CPU times without compromising the quality of the results. This is motivated by applications that have objective functions with expensive computational times at high delity solutions. Applying, matching, and tuning optimization techniques at an algorithm level can reduce the time spent on unpro table computations for parameter optimization. The objective is to recover known parameters of a -ow property reference image by comparing to a template image that comes from a computational -uid dynamics simulation, followed by a numerical image registration and comparison process. Mixed variable pattern search and mesh adaptive direct search methods were applied using surrogate functions in the search step to produce solutions within a tolerance level of experimental observations. The surrogate functions are based on previous function values and computational times of those values. The use of multiple surrogates at each search step provides parameter selections that lead to improved solutions of an objective function evaluation with less computational time. Previously computed values for the objective function and computation time were used to compute a time cut-o parameter that allows termination during an objective function evaluation if the computational time exceeded a threshold or a divergent template image was created. This approach was tested using DACE and radial basis function surrogates within the NOMADm MATLABr software. The numerical results are presented.

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Improving Mixed Variable Optimization of Computational and Model Parameters Using Multiple Surrogate Functions

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