Author, institution: Edgaras Vaštakas, Kaunas University of Technology
Dissertation is defended externally.
Science area, field: Technology Sciences, Measurement Engineering – 10T
The Doctoral Dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas).
Scientific Advisor: Prof. Dr. Habil. Stasys Vygantas AUGUTIS (Kaunas University of Technology, Technological Sciences, Measurement Engineering – 10T).
Dissertation Defence Board of the Measurement Engineering Science Field:
Assoc. Prof. Dr. Paulius KAŠKONAS (Kaunas University of Technology, Technological Sciences, Measurement Engineering – 10T) – chairman;
Prof. Dr. Mindaugas JUREVIČIUS (Vilnius Gediminas Technical University, Measurement Engineering – 10T);
Prof. Dr. Habil. Tamara KUJAWSKA (Institute of Fundamental Technological Research of the Polish Academy of Science, Technological Sciences, Measurement Engineering – 10T);
Prof. Dr. Liudas MAŽEIKA (Kaunas University of Technology, Technological Sciences, Measurement Engineering– 10T);
Prof. Dr. Renaldas RAIŠUTIS (Kaunas University of Technology, Technological Sciences, Measurement Engineering – 10T).
Annotation:
Thesis of this work presents new type of acoustic emission transducer calibration methods.
The aim of the scientific research is to investigate the possibilities of application of mechanical effects generated in dispersive waveguides to calibrate the low-frequency AET and to create measures for their calibration.
Two new arbitrary waveform mechanical displacement generation methods are proposed with limit coefficients and modified deconvolution methods. Measurement results demonstrate the proposed methods’ application possibilities for the generation of arbitrary type displacements in waveguides with dispersive properties. Advantages of new methods were shown in a comparative analysis between the existing and the proposed methods. AET calibration stand constructions of a new type were proposed in the dissertation, offering calibration with different types of wave’s opportunities and reduced size, compared to existing solutions. These constructions use bar and plate type waveguides, waveguide arrays, and structures with acoustic fiber dampers. Until now, these constructions haven’t been used for AET calibration, because of limited possibilities to generate arbitrary waveform displacements. Offered construction application possibilities for AET calibration are presented by the measurement and calculation results in dissertation.
