S. G. Krishnamoorthy “Attenuation of vibration by controlling the mechanical transmissibility of electromechanical devices” doctoral dissertation defence

Thesis Defense

Author, Institution: Shanker Ganesh Krishnamoorthy, Kaunas University of Technology

Science area, field of science: Technological Sciences, Mechanical Engineering, T009

Scientific Supervisor: Doc. dr. Inga Skiedraitė (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – T009)

Dissertation Defence Board of Mechanical Engineering Science Field:
Prof. Dr. Giedrius Janušas (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – T009) – chairman
Dr. Habil. Algimantas Bubulis (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – T009)
Prof. Dr. Arkadiusz Mystkowski (Bialystok Technical University, Poland, Technological Sciences, Mechanical Engineering – T009)
Prof. Dr. Juozas Padgurskas (Vytautas Magnus University, Technological Sciences, Mechanical Engineering – T009)

The dissertation defence takes place online.

The doctoral dissertation is available on the internet and at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas).

Annotation:

The aim of the research work was to investigate and develop a method for attenuating micro-vibration by controlling the mechanical resonance characteristics of a transitional structure.
Scientific novelty of the research work
1. A theoretical model to explain the response of piezoelectric bimorph by considering two input voltages with phase shifts is presented in this research. Also, the experimental research demonstrating 50% alleviation in flutter is possible by directly shunting active and passive layers of a piezoelectric bimorph bender and without additional shunt circuit.
2. Theoretical evaluation of a novel method to attenuate vibration by controlling frictional force between two steel plates under the influence of varying magnetic flux. Also, the application of the current approach is evaluated in this research.
3. The influence of counterforce in varying stiffness of the system for an eddy current damper and a two-coil electromagnetic dashpot is theoretically and experimentally evaluated.
Practical value
This research gives a theoretical and practical insight into three different methods for attenuating micro-vibration by controlling the mechanical transmissibility of electromechanical devices and by controlling the stiffness of the system. The different vibration attenuation techniques proposed and investigated throughout this research are suitable for applications related to altered gravity and varying atmospheric pressure, thus making them also suitable for space applications. Furthermore, these simple methods can be used for the design and development of packing technologies which require attenuation of vibration for the transportation of fragile and valuable materials.

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