Author(s)

I. Spacapan, M. Premrov

Abstract

Analysis of wave propagation in waveguides by FEM via eigenvalue problem I. Spacapan, M. Premrov Faculty of Civil Engineering, University ofMaribor, Slovenia. Abstract Several important engineering problems are modelled by infinite waveguides, where a certain section may be inhomogeneous or have irregular geometry or obstacles. In such sections the waves may partially reflect, but in the concatenated homogeneous part of the waveguide, which stretches to infinity, the waves propagate only away from the source of excitation, yet some of them may be decaying standing waves. When solving the dynamics of the waveguide by FEM we have to introduce an artificial boundary, where radiation conditions have to be properly encountered for exact results. We are proposing the a procedure, which solves the dynamics of the waveguide in the frequency domain exactly, but within the error immanent to discretization in FEM. In addition, this procedure yields a parametric study of wave propagatio

Keywords