Experimental Research on Piezoelectric Power Harvesting System
| Autor: | 韓春生 |
|---|---|
| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 In this thesis, we study the energy conversion system that can provide the operating energy for the Micro-Electron-Mechanical-System (MEMS) and the wireless devices by using the piezoelectric materials. Because the piezoelectric materials have the ability of electrical and mechanical coupling, they can convert the strain energy, which is generated by any kind of vibration, into the electrical energy. Furthermore, the piezoelectric materials have the advantages of less weight, fast response, high sensitivity, no electromagnetic interference, good stability and good energy conversion rate so they are suitable to be used in the MEMS and the wireless devices. In this study, we focus on the properties of piezoelectric materials and then theoretically derive the governing equations of these materials. Several experiments are performed on the resonant frequency in the different geometric shape of PZT composite beam, different electrode and external loads. The experiment results show that the resonant frequency and the output voltage will be changed in different geometric shape of the piezoelectric materials, of which the vibrated behavior will be affected by the different external electrical devices. However, the influence of electrode is usually excluded because the thickness of electrode is much smaller than that of the piezoelectric material. And we can find that the different shape of electrode gives rise to the different conversion rate of electrical and mechanical coupling. Moreover, if the external capacitor doesn’t match the internal equivalent capacitor of the piezoelectric materials, it could not be charged by the vibration of piezoelectric materials. In conclusion, we analyze the property of the piezoelectric material and the effect of the different external load. This work provides useful information which will be useful for further studies. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|