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Reduction of the structure-acoustic problem using normal modes and lanczos vectors

Publiceringsår: 2003
Språk: Engelska
Sidor: 2203-2210
Publikation/Tidskrift/Serie: Proceedings of the 10th International Congress on Sound and Vibration
Dokumenttyp: Konferensbidrag
Förlag: Institute of Acoustics


The coupled structure-acoustic problem is studied using the finite element method. An efficient strategy for solving the coupled eigenvalue problem is proposed. The strategy uses a limited number of the uncoupled structural normal modes and acoustic fluid normal modes together with a set of interface-dependant Lanczos vectors for each domain to reduce the coupled problem. The Lanczos vectors are calculated by applying the vectors derived from the movement of the uncoupled modes of the interacting domain. For example, the pressure distribution of the fluid modes are used to generate the Lanczos vectors for the structural domain. This ends up in a very compact coupled eigenvalue problem to be solved. The method is investigated in a numerical example.



  • Technology and Engineering
  • Structure-acoustic problem
  • Interacting domain
  • Modal reduction
  • Fluid domain


Proceedings of the Tenth International Congress on Sound and Vibration
Stockholm, Sweden

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