Isogeometric Shape Optimization of Vibrating Membranes

Dang Manh Nguyen, Anton Evgrafov, Allan Roulund Gersborg, Jens Gravesen

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We consider a model problem of isogeometric shape optimization of vibrating membranes whose shapes are allowed to vary freely. The main obstacle we face is the need for robust and inexpensive extension of a B-spline parametrization from the boundary of a domain onto its interior, a task which has to be performed in every optimization iteration. We experiment with two numerical methods (one is based on the idea of constructing a quasi-conformal mapping, whereas the other is based on a spring-based mesh model) for carrying out this task, which turn out to work sufficiently well in the present situation. We perform a number of numerical experiments with our isogeometric shape optimization algorithm and present smooth, optimized membrane shapes. Our conclusion is that isogeometric analysis fits well with shape optimization.
Original languageEnglish
JournalComputer Methods in Applied Mechanics and Engineering
Issue number13-16
Pages (from-to)1343-1353
Publication statusPublished - 2011


  • shape optimization
  • eigenvalues of the Laplace operator
  • B-spline parametrization
  • vibrating membrane
  • Isogeometric analysis

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