Condensing structural finite element meshes into coarser acoustic element meshes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The sound power radiated by a vibrating structure (with negligible fluid loading) is typically computed in two steps. First, a finite element mesh of the structure is constructed, and the structural vibrations are computed. The finite element mesh is then converted to a surface mesh, and the sound power output is computed using the boundary element method. In many cases, the acoustic analysis is computationally inefficient because the structural finite element mesh is much denser than required for the acoustic calculations, leading to the solution of a large, fully populated, matrix equation. It is shown that the efficiency of the acoustic analysis can be significantly increased by condensing the structural finite element mesh into a much coarser acoustic element mesh, where the surface meshes of several structural elements are combined to form a single acoustic element. This condensation- becomes possible when the boundary condition for the acoustic analysis is written in terms of elemental volume velocities instead of nodal velocities. An example is given in which sample computation times are tabulated, and the accuracy of the numerical calculations are assessed.

Original languageEnglish (US)
Title of host publication15th Biennial Conference on Mechanical Vibration and Noise - Acoustics, Vibrations, and Rotating Machines
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages641-646
Number of pages6
ISBN (Electronic)9780791897652
DOIs
StatePublished - 1995
EventASME 1995 Design Engineering Technical Conferences, DETC 1995, collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium - Boston, United States
Duration: Sep 17 1995Sep 20 1995

Publication series

NameProceedings of the ASME Design Engineering Technical Conference
Volume3B-1995

Conference

ConferenceASME 1995 Design Engineering Technical Conferences, DETC 1995, collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium
CountryUnited States
CityBoston
Period9/17/959/20/95

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Computer Graphics and Computer-Aided Design
  • Computer Science Applications
  • Modeling and Simulation

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