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Comparison of Parallel Surrogate-Assisted Optimization Approaches

  • The availability of several CPU cores on current computers enables parallelization and increases the computational power significantly. Optimization algorithms have to be adapted to exploit these highly parallelized systems and evaluate multiple candidate solutions in each iteration. This issue is especially challenging for expensive optimization problems, where surrogate models are employed to reduce the load of objective function evaluations. This paper compares different approaches for surrogate modelbased optimization in parallel environments. Additionally, an easy to use method, which was developed for an industrial project, is proposed. All described algorithms are tested with a variety of standard benchmark functions. Furthermore, they are applied to a real-world engineering problem, the electrostatic precipitator problem. Expensive computational fluid dynamics simulations are required to estimate the performance of the precipitator. The task is to optimize a gas-distribution system so that a desired velocity distribution is achieved for the gas flow throughout the precipitator. The vast amount of possible configurations leads to a complex discrete valued optimization problem. The experiments indicate that a hybrid approach works best, which proposes candidate solutions based on different surrogate model-based infill criteria and evolutionary operators.

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Author:Frederik Rehbach, Martin Zaefferer, Jörg Stork, Thomas Bartz-Beielstein
Series (Serial Number):CIplus (7/2018)
Document Type:Working Paper
Year of Completion:2018
Release Date:2018/11/19
Tag:Electrostatic Precipitator; Modeling; Optimization; Parallelization; Surrogates
Page Number:12
Institutes and Central Facilities:Fakultät für Informatik und Ingenieurwissenschaften (F10)
Dewey Decimal Classification:000 Allgemeines, Informatik, Informationswissenschaft / 004 Informatik
Open Access:Open Access
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International