title: Modal decomposition of exterior acoustic-structure interaction problems with model order reduction.
abstract: A numerical technique for modal decomposition of the acoustic responses of structures submerged in a heavy fluid medium using fluid-loaded structural modes is presented. A Krylov subspace model order reduction approach to reduce the computational effort required for a fully coupled finite element/boundary element model is described. By applying the Krylov subspace to only the structural part of the global system of equations for the fully coupled problem, only the frequency independent finite element matrices are reduced. A fluid-loaded cylindrical shell closed at each end by hemispherical end caps is examined. The cylinder is excited by a ring of axial or transverse forces acting at one end. The individual contributions of the cylinder circumferential modes to the sound power and directivity of the radiated sound pressure are observed. The technique presented here provides a tool for greater physical insight into exterior acoustic-structure interaction problems using fully coupled numerical models, with significantly reduced computational effort.
authors.affiliation: School of Mechanical and Manufacturing Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Herwig
authors.initials: H
authors.lastname: Peters
authors.affiliation: School of Mechanical and Manufacturing Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Nicole
authors.initials: N
authors.lastname: Kessissoglou
authors.affiliation: LRT4-Institute of Mechanics, Universität der Bundeswehr München, D-85579 Neubiberg, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Marburg