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The inner structure of sensitivities in nodal based shape optimisation

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Abstract

The pseudo load matrix and the sensitivity matrix dominate design sensitivity analysis of shape optimisation problems. They describe how a structure reacts on an imposed design modification. We analyse these matrices for the model problem of nodal based shape optimisation by a singular value decomposition and show that they contain additional valuable information which is not yet used either in theory or computation of shape optimisation. The inner structure of the sensitivities is capable to formulate reduced quadratic sub-problems within the sequential quadratic programming approach. We also tackle the problem of indefinite Hessian matrices in nodal based shape optimisation. Furthermore, we avoid jagged boundaries and obtain mesh-independent optimised structures applying density filtering technique to shape optimisation. Overall, we emphasise an enhanced analysis of sensitivities and point to unused substantial capabilities.

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Authors and Affiliations

  1. Numerical Methods and Information Processing, Technische Universität Dortmund, August-Schmidt-Straße 8, 44227, Dortmund, Germany

    Nikolai Gerzen, Daniel Materna & Franz-Joseph Barthold

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  1. Nikolai Gerzen
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  2. Daniel Materna
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  3. Franz-Joseph Barthold
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Correspondence to Nikolai Gerzen.

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Gerzen, N., Materna, D. & Barthold, FJ. The inner structure of sensitivities in nodal based shape optimisation. Comput Mech 49, 379–396 (2012). https://doi.org/10.1007/s00466-011-0648-8

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