title: Finite element analysis of guided waves in fluid-filled corrugated pipes.
abstract: Free wave propagation in fluid-filled corrugated pipes is analyzed using finite element methods in combination with a wave-based approach. By combining discretized models with a wave-based approach, complex mechanism of wave motion in the three-dimensional waveguide is fully included. The pipes are treated as waveguides having periodic properties in the direction of wave propagation. The analysis of these guided waves leads to dispersion curves which show the strong frequency-dependency of the different wave modes. The method also allows the inclusion of coupling between fluid-borne and structure-borne wave modes which occur at the acoustic-structure interface. Phase and group velocities of the wave modes are derived in postprocessing steps. Additionally, the energy ratio of the fluid-domain and solid-domain vibrational energies is computed. Finally, linear damping models are included in order to explore wave mode attenuation.
authors.affiliation: Institute of Applied and Experimental Mechanics, University of Stuttgart, Pfaffenwaldring 9, 70550 Stuttgart, Germany. maess@iam.uni-stuttgart.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Maess
authors.forename: Jan
authors.initials: J
authors.lastname: Herrmann
authors.forename: Lothar
authors.initials: L
authors.lastname: Gaul