Published Online: 1 August 2012
Page Count: 12
Modeling in Geomechanics, Bauhaus-Univ. Weimar, Weimar,
Institute of Mathematics and Physics, Bauhaus-Univ. Weimar, Weimar,
Chair of Foundation Engineering, Soil and Rock Mechanics, Ruhr-Univ. Bochum, Bochum,
(Received 23 December 2010; accepted 4 June 2012)
Signal processing techniques are very important for the analysis of dispersion characteristics in geotechnical laboratory applications. The scope of this paper includes the study of advanced time-frequency and time-scale methods with regard to the development of an efficient method of group velocity determination based on the time-frequency behavior of propagating wave fields. The paper analyzes different time-frequency and time-scale transform methods for further use in group velocity determination as alternatives to conventional techniques. Besides the alternative itself, the presented scheme overcomes some existing problems of conventional methods in velocity determination. The advantages and disadvantages of the time-frequency and time-scale methods are presented and discussed. Finally, the applicability of given time-frequency and time-scale methods is validated by synthetic and experimental data.
Paper ID: GTJ103727