TY - JOUR A1 - Gravenkamp, Hauke A1 - Birk, C. A1 - Song, C. T1 - Numerical modeling of elastic waveguides coupled to infinite fluid media using exact boundary conditions N2 - The simulation of guided waves in plate structures and cylinders coupled to infinite fluids is addressed. The approach is based on the Scaled Boundary Finite Element Method. Only a straight line is discretized that represents the through-thickness direction or the radial direction. The surrounding fluid is accounted for by employing a damping boundary condition that is based on the analytical description of the radiation impedance. Since the radiation impedance is a function of the wavenumber in the waveguide, an iterative solution procedure is applied. The algorithm is highly efficient while the results are in agreement with the Global Matrix Method. KW - Guided waves KW - Embedded KW - Fluid KW - Ultrasound KW - Scaled boundary finite element method PY - 2014 DO - https://doi.org/10.1016/j.compstruc.2014.05.010 SN - 0045-7949 SN - 0366-7138 VL - 141 SP - 36 EP - 45 PB - Pergamon Press CY - Oxford AN - OPUS4-30896 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gravenkamp, Hauke A1 - Birk, C. A1 - Van, J. T1 - Modeling ultrasonic waves in elastic waveguides of arbitrary cross-section embedded in infinite solid medium N2 - An approach is presented to model elastic waveguides of arbitrary cross-section coupled to infinite solid media. The formulation is based on the scaled boundary-finite element method. The surrounding medium is approximately accounted for by a dashpot boundary condition derived from the acoustic impedances of the infinite medium. It is discussed under which circumstances this approximation leads to sufficiently accurate results. Computational costs are very low, since the surrounding medium does not require discretization and the number of degrees of freedom on the cross-section is significantly reduced by utilizing higher-order spectral elements. KW - Guided waves KW - Scaled boundary finite element method KW - Leaky waves KW - Ultrasound PY - 2015 DO - https://doi.org/10.1016/j.compstruc.2014.11.007 SN - 0045-7949 SN - 0366-7138 VL - 149 SP - 61 EP - 71 PB - Pergamon Press CY - Oxford AN - OPUS4-32348 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -