Robust design optimization of structures with multimodal responses using Taylor expansions

This paper shows how a combination of multiple linear approximations can efficiently capture nonlinear and non-smooth response functions in the framework of robust design optimization. The basic idea is to split the domain of random parameters into multiple subdomains along discontinuities of the response. For each subdomain, a linear approximation is used to determine the stochastic moments of the response function due to the scatter in that subdomain. The total stochastic distribution of the structural response is considered to be a multimodal distribution, and its moments are composed of the approximations in the subdomains. The application to use cases shows that indeed the structural response is multimodal in these cases, and the stochastic moments are shown to be sufficiently accurate using the proposed method.

Subjects

Multimodal response

Probabilistic analysis

Robust design optimization

Taylor series approximation

DDC Class

624.17: Structural Analysis and Design

Funding(s)

Form- und Topologieoptimierung imperfektionssensitiver Strukturen bei streuender Geometrie

Projekt DEAL

Publication version

publishedVersion

Name

s00158-025-04191-9.pdf

Size

3.19 MB

Format

Adobe PDF

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Robust design optimization of structures with multimodal responses using Taylor expansions