Power Harvest and Model Derivation of An Adjustable PZT Beam

• Main Authors: Che-hau Wu, 吳哲豪
• Other Authors: Shyh-Chin Huang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/04468713781147970829

碩士 === 國立臺灣科技大學 === 機械工程系 === 97 === Piezoelectric materials are widely used as power harvesting device due to its ability to transform mechanical energy into electrical energy and vice versa. In this thesis, a power harvesting model is developed and electrical charge of the model is derived. The model is an adjustable Euler-Bernoulli beam with PZT bounded on its both surfaces. PZT electrodes are shunted with RLC circuit with a standard interface. In the analytic work, first we neglect the electro-mechanical coupling to estimate the mechanical mode shape of the beam. Next, excite the model with harmonic displacement on its boundary condition. The electro-mechanical coupling is considered to calculate the PZT energy form. Assume mode and separation variable method are used to derive the Lagrange equation of motion then with the electrical circuit model the electrical charge is derived. Experimental work is conducted to test and verify the model. Finally, it gives good results. The advantage of this model is the system frequency can be tuned into environment frequency to get better power harvesting which people can continue for future research.