A. Nečiūnas “Algorithms of numerical simulation of elastic waves propagating in dissipative environments” doctoral thesis defence

Author, Institution: Audrius Nečiūnas, Kaunas University of Technology

Science area, field of science: Physical Sciences,  Informatics, 09P

Scientific Supervisor: Prof. Habil. Dr. Rimantas Barauskas (Kaunas University of Technology, Physical Sciences,  Informatics, 09P).

Dissertation Defence Board of Informatics Science Field:
Prof. Dr. Habil. Minvydas Kazys Ragulskis (Kaunas University of Technology, Physical Sciences,  Informatics, 09P) – chairman,
Prof. Dr. Habil. Rimantas Kačianauskas (Vilnius Gediminas Technical University, Technical Sciences, Mechanical Engineering, 09P),
Prof. Dr. Gintaras Palubeckis (Kaunas University of Technology, Physical Sciences,  Informatics, 09P),
Assoc. Prof. Dr. Kristina Poškuvienė (Kaunas University of Technology, Physical Sciences,  Informatics, 09P),
Prof. Dr. Miguel A.F. Sanjuan (Rey Juan Carlos University, Physical Sciences,  Informatics, 09P).

The doctoral dissertation is available at the libraries of Kaunas University of Technology (K. Donelaičio str. 20, Kaunas), Vytautas Magnus Universitety (K. Donelaičio g. 52, Kaunas), and Vilnius Gediminas Technical University (Saulėtekio al. 14, 10223 Vilnius).

Annotation:

The simulation of propagating waves is of primary importance in many engineering applications, such as planning ultrasonic measurement procedures, monitoring of the structural integrity of pipelines by analyzing pressure pulses propagation, earthquake waves propagation and many other types of real-life applications. Traditionally, the computational methods of wave propagation analysis in geometrically complex structures and environments use the finite element or the finite difference approaches. However, inherent shortcomings arise due to huge dimensionalities of the models in cases when the length of the analyzed waves is much lesser than the linear dimensions of the structure. When the structure, that supports the wave, is consistent along at least one direction, more effective methods can be applied, namely semi analytical finite element method. The dissertation covers algorithms, that are based on semi analytical finite element method, to model the waves in waveguide in dissipative environment.