Robust Aeroelastic Optimisation of Composite Plate Wings Subject to Ply Orientation Uncertainty

Carl Scarth, Pia Sartor, Jonathan Cooper, Paul Weaver, Gustavo H C Silva

Research output: Contribution to conferenceConference Paperpeer-review

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Abstract

An approach is presented for the robust stacking sequence optimisation of composite plate wings with uncertain ply orientations. An aeroelastic model is constructed using the Rayleigh-Ritz technique coupled with modified strip theory aerodynamics. Gaussian process emulators are used in conjunction with Support Vector Machine classifiers to construct a surrogate for the discontinuous and non-smooth aeroelastic instability speed, across the space of lamination parameters. The surrogate model is used to estimate the probability that instability occurs at a given design speed, which is minimised using a genetic algorithm. For each evaluation of the objective function, existing data points are reused and the surrogate is updated when required using an adaptive Design of Experiments based upon a modified Latin Hypercube. Optimised stacking sequences are compared to deterministic optima for maximum instability speed. Three layup strategies are undertaken; (i) a benchmark in which ply orientations are limited to 0°, ±45° and 90°, (ii) in which values of ±30° and ±60° are also permitted, and (iii) in which orientations are fixed to 5° increments. Improvements in reliability of at least 83% are achieved using the benchmark layup strategy, with at least 95% and 97% improvements for the second and third strategies respectively. A factor of twenty reduction in the required number of model runs is achieved by using the adaptive surrogate, though this only corresponds to a factor of four reduction in computation time due to the additional time required to fit the surrogate.
Original languageEnglish
Publication statusPublished - 24 Jul 2015
Event20th International Conference on Composite Materials - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015

Conference

Conference20th International Conference on Composite Materials
CountryDenmark
CityCopenhagen
Period19/07/1524/07/15

Keywords

  • Aeroelastic tailoring
  • Composite wings
  • Robust optimisation
  • Uncertainty quantification

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