Author, Institution: Darius Eidukynas, Kaunas University of Technology
Science Area, Field of Science: Technological Sciences, Mechanical Engineering – 09T
Scientific Supervisor: Assoc. prof. Dr. Vytautas JŪRĖNAS, (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T)
Dissertation Defence Board of Mechanical Engineering Science Field:
Prof. Habil. Dr. Vytautas Ostaševičius (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T) – chairman
Habil. Dr. Algimantas Bubulis (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T)
Prof. Dr. Sergei Kruchinin (Bogolyubov Institute for Theoretical Physics, Ukraine, Physical Sciences, Physics – 02P),
Prof. Dr. Juozas PADGURSKAS (Aleksandras Stulginskis University, Technological Sciences, Mechanical Engineering – 09T)
The Doctoral Dissertation is available at the libraries of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas) and Aleksandras Stulginskis University (Studentų g. 11, Akademija, Kauno raj.)
Annotation:
Energy harvesting, which, in general, is the conversion of ambient energy into usable electrical energy, nowadays is one of the most popular topics between scientists and industry users due to the fact that extended life of electronic devices is imperative. Energy harvesting devices can reduce the size of traditional power supply thus reducing the size and mass of the whole system. Moreover, energy harvesting devices can be used in such environments where replacing traditional batteries is difficult or impossible, e.g. in implanted medical devices or space technologies.
In this research, a novel piezoelectric impact energy harvester, intended for high frequency burst-type signal generation using horn-type waveguide as resonator of particular frequency, which increases the amplitude of generated burst-type signal and protects the brittle piezoceramic material from breakage due to by impact is designed. Such a device allows to drive and control an ultrasonic motor in environments where traditional power supplies, such as power supply or batteries are unavailable or when they are damaged. In this work horn-type waveguide was investigated in different way – with harmonic and impulse excitation on the surface with a smaller cross-sectional area thus allowing to uniformly transmit the impact energy to piezoelectric transducer with a surface of greater cross-sectional area.
