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PERMAS-OPT + PERMAS-RA: Robust Design Optimization

Optimization of water box with 18 design variables
and 19 stochastic basic variables.

Mass:M409 g315 g321 g
Failure probability:Pf4.78 · 10-66.80 · 10-31.55 · 10-6
Failure rate (one of):209 205147645 161

In order to achieve a robust design, it is not sufficient to perform a simple optimization:

  • Optimization often leads to reduced safety margins.
  • The optimized design may have other critical parameters than the inital design.
  • A 'reliable' optimum may be different than a deterministic one.

The proposed solution is a combination of optimization and reliability analysis.