Generalized shape optimization of transient vibroacoustic problems using cut elements

Cetin Batur Dilgen*, Niels Aage

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper propose a generalized shape optimization method for transient coupled acoustic‐mechanical interaction problems. The transient problem formulation allows to optimize for a broadband frequency content and the possibility to investigate transient phenomena such as pulse shaping. Throughout the work, the geometry is defined with the help of a nodal based design field, for which its zero level contour describes the interface between acoustic and structural domains. The approach utilizes a fixed background mesh to represent the geometry and a cut element immersed boundary method for the physical modelling. This modelling approach provides accurate solutions to the strongly coupled governing equations based on a special integration scheme. The optimization problem is solved using a gradient based optimizer and employs a fully discrete adjoint approach for calculating the sensitivity information. A numerical examination on the accuracy of the sensitivity analysis compares the fully discrete gradients to the commonly used semi‐discrete adjoint approach for transient optimization revealing the importance of consistent sensitivities. The transient design formulation is validated on a 2D benchmark problem concerning the design of a time‐harmonic acoustic partitioner. The developed framework is then applied for the design of vibroacoustic pulse shaping devices to demonstrate control of a transient phenomena.
Original languageEnglish
JournalInternational Journal for Numerical Methods in Engineering
Number of pages27
ISSN0029-5981
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Vibroacoustics
  • Transients
  • Generalized shape optimization
  • Cut elements
  • Gradients
  • Level set methods

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