Free vibration by length-scale separation and inertia-induced interaction -application to large thin-walled structures

Aleksi Laakso*, Jani Romanoff, Ari Niemela, Heikki Remes, Eero Avi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
31 Downloads (Pure)

Abstract

This paper analyses free vibration of interacting length-scales of 3D-thin-walled structures by combination of Finite Elements Method and analytical calculation of strain and kinetic energies. Equivalent single layer elements with structurally homogenized mass and stiffness enable significantly reduced computational cost. Analytical equations are used to re-introduce effects of inertia-induced deformations of the local length-scale that are restrained by the kinematic of homogenized equivalent single layer elements. The method is validated against fine mesh Finite Element Analysis in a case study representing typical 3D-structure seen in cruise ships. The method achieves excellent accuracy for the 10 first natural modes.

Original languageEnglish
Pages (from-to)1234-1248
Number of pages15
JournalMechanics of Advanced Materials and Structures
Volume30
Issue number6
Early online date14 Feb 2022
DOIs
Publication statusPublished - 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Free vibration
  • length-scale interaction
  • finite element method
  • energy method
  • thin-walled structure
  • ship structure
  • WAVE-PROPAGATION

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