Stochastic Sensitivity Analysis for Robust Topology Optimization

Document Type

Contribution to Book

Publication Date

2018

Publication Title

Advances in Structural and Multidisciplinary Optimization: Proceedings of the World Congress of Structural and Multidisciplinary Optimization

DOI

10.1007/978-3-319-67988-4_26

ISBN

978-3-319-67988-4

Abstract

Topology optimization under uncertainty poses extreme difficulty to the already challenging topology optimization problem. This paper presents a new computational method for calculating topological sensitivities of statistical moments of high-dimensional complex systems subject to random inputs. The proposed method, capable of evaluating stochastic sensitivities for large-scale, robust topology optimization (RTO) problems, integrates a polynomial dimensional decomposition (PDD) of multivariate stochastic response functions and deterministic topology derivatives. In addition, the statistical moments and their topology sensitivities are both determined concurrently from a single stochastic analysis. When applied in collaboration with the gradient based optimization algorithm, the proposed method affords the ability of solving industrial-scale RTO design problems. Numerical examples indicate that the new method developed provides computationally efficient solutions.

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