HARDENING NONLINEAR STIFFNESS BEHAVIOUR OF PIEZOELECTRIC MATERIALS WITH PASSIVE NONLINEAR P-N JUNCTION CAPACITANCE SHUNT CIRCUITS

Download

10423377.pdf

Date

2021-9-06

Author

Taşkıran, Muhammed Ali

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

454
views

127
downloads

Piezoelectric materials are electromechanical energy transducers. They can be utilized actively when energized electrically or passively when connected to a passive shunt circuit. Due to this, they have been suggested for several vibrations suppression and energy harvesting applications. In this thesis, a novel way to attain passive hardening stiffness was suggested by introducing an electrical component for passive nonlinear piezoelectric vibration isolation or energy harvesting. Since piezoelectric materials can be used actively or passively, the introduced component allows it to use of active and passive vibration isolation techniques at the same time. A passive nonlinear component was suggested to be hardening capacitor attained by P-N junction. For the first step of this thesis, conceptual proof that hardening capacitor provides hardening stiffness is demonstrated. The hardening effect in frequency and time domain for single degree of freedom is then studied as the next step. Then the study is extended to piezo attached cantilever beam case. Equations for the beam structure are derived, and they are validated with numerical solutions and tests. It is shown that the test and the numerical simulation results are in agreement with the analytical solutions.

Subject Keywords

Passive Hardening Capacitance, Piezoelectric Vibration Isolation, Passive Vibration Isolation, Nonlinear Passive Shunt Circuit, Varactor.

URI

https://hdl.handle.net/11511/93047

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Carbon Coating of magnesium via thermal plasma Aktekin, Burak; Eyövge, Cavit; Öztürk, Tayfur (null; 2018-05-07) Magnesium is a material of considerable interest for electrochemical as well as thermal energy storage. Carbon coated magnesium or magnesium nanopartciles emebedded in a graphitic matrix could provide solutions to some of the problems currently faced in these application areas. The current study was undertaken to develop Mg-C composites at a variety of length scales. The synthesis was achieved by co-feeding magnesium and methane into an RF thermal plasma reactor. This yielded carbonaceous material with magn...
Energy Harvesting from Piezoelectric Stacks Using Impacting Beam Ozpak, Yigit; Aykan, Murat; Çalışkan, Mehmet (2015-02-05) Piezoelectric materials can be used for energy harvesting from ambient vibration due to their high power density and ease of application. Two basic methods, namely, tuning the natural frequency to the operational frequency and increasing the operation bandwidth of the harvester are commonly employed to maximize the energy harvested from piezoelectric materials. Majority of the studies performed in recent years focus mostly on tuning the natural frequency of the harvester. However, small deviations in operat...
Development andcharacterization of activated carbon / transition metal phosphide composites for electrochemical capacitors Köse, Kadir Özgün; Aydınol, Mehmet Kadri (null; 2019-09-11) Electrochemical capacitors are the energy storage devices based mainly on electrical double layer formation. Their power densities are exceptionally high; however, their energy densities are characteristically low to compete various types of batteries in market. Therefore, there have been great amount of studies to enhance electrochemical capacitors’ energy density. Utilization of inorganic materials such as transition metal oxides and/or phosphides is one of the most common strategies to increase energy de...
Chatter reduction in boring process by using piezoelectric shunt damping with experimental verification Yıgıt, Ufuk; Ciğeroğlu, Ender; Budak, Erhan (2017-09-15) Chatter is a self-excited type of vibration that develops during machining due to process structure dynamic interactions resulting in modulated chip thickness. Chatter is an important problem as it results in poor surface quality, reduced productivity and tool life. The stability of a cutting process is strongly influenced by the frequency response function (FRF) at the cutting point.
Broadband terahertz modulators using self-gated graphene capacitors Kakenov, Nurbek; Balci, Osman; Polat, Emre O.; Altan, Hakan; KOCABAŞ, COŞKUN (2015-09-01) We demonstrate a terahertz intensity modulator using a graphene supercapacitor which consists of two large-area graphene electrodes and an electrolyte medium. The mutual electrolyte gating between the graphene electrodes provides very efficient electrostatic doping with Fermi energies of 1 eV and a charge density of 8 x 10(13) cm(-2). We show that the graphene supercapacitor yields more than 50% modulation between 0.1 and 1.4 THz with operation voltages less than 3 V. The low insertion losses, high modulati...

Citation Formats

M. A. Taşkıran, “HARDENING NONLINEAR STIFFNESS BEHAVIOUR OF PIEZOELECTRIC MATERIALS WITH PASSIVE NONLINEAR P-N JUNCTION CAPACITANCE SHUNT CIRCUITS,” M.S. - Master of Science, Middle East Technical University, 2021.