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Multidisciplinary System Optimisation on the Design of Cost Effective Space Launch Vehicle Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Parameterization Setup for Metamodel Based Optimizations of Tailor Rolled Blanks

Authors : Niklas Klinke, Axel Schumacher

Published in: Advances in Structural and Multidisciplinary Optimization

Publisher: Springer International Publishing

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Abstract

Tailor Rolled Blanks (TRB) are an established lightweight application for highly stressed structural parts in automotive industry. By varying the rolling gap, parts with load adapted thickness profiles and continuous transitions are manufactured. The rolling process itself is subjected to several manufacturing constraints which have to be considered in the numerical optimization. It has been shown that the thickness run parametrization has significant impact on the optimization result and the associated computational cost.
The goal of the presented methods is to systematically assess the number of areas of constant thickness (plateaus) and setup a thickness run parametrization for subsequent metamodel based TRB optimization.
Starting from a baseline design, the rolling direction is determined based on an optimality criterion. Three approaches are then compared to create an initial thickness distribution along the axis of maximum inhomogeneity without the need of additional non-linear function evaluations:
1.
Single iteration ESL-optimization
 
2.
Single iteration HCA scheme
 
3.
Scaling of stress distribution
 
The created distributions have to be interpreted in order to generate a parametrization for metamodel based optimization which takes all TRB design constraints into account. The interpretation is performed by solving an optimization tasks, resulting in the thickness run with the least deviation to the input thickness distribution.
Two application examples are presented. A crash beam subjected to three point bending is optimized using two load case setups. Also a submodel of the NCAC Toyota Yaris in full frontal crash is used to optimize the front rail assembly. The results of the subsequent metamodel based optimization are compared to the results of metamodel based optimizations with a general parametrization setup.

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Metadata
Title
Parameterization Setup for Metamodel Based Optimizations of Tailor Rolled Blanks
Authors
Niklas Klinke
Axel Schumacher
Copyright Year
2018
Book
Advances in Structural and Multidisciplinary Optimization

Print ISBN: 978-3-319-67987-7

Electronic ISBN: 978-3-319-67988-4

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-67988-4_137

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