Design and Evaluation of a Novel Knitted Piezoelectric Energy Harvester for Tiny Ocean Waves

• Main Authors: Chieh-WeiTsai, 蔡介偉
• Other Authors: Sheng-Chih Shen
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/26281538194600588470

碩士 === 國立成功大學 === 系統及船舶機電工程學系 === 102 === The thesis presents a novel knitted PVDF films energy harvester with knocking structure for tiny ocean waves. This design is used in low amplitude wave condition and it can transform the low frequency of waves into higher frequency vibrations using a knocking structure with a spring. This knitted PVDF films energy harvester contains three units which are knitted PVDF films, beating element and a knocking structure with a spring. Knocking structure is designed in three kinds of shapes which are cylinder shape, half-capsule shape and tumbler shape. For the simulation results, the length of supporting layers does not affect the harvesting efficiency for this structure obviously. In addition, knocking structure in tumbler shape can add more stress in piezoelectric materials than with cylinder shape or half-capsule shape. The novel knitted PVDF films energy harvester with knocking structure can generate 0.31mW, 0.48mW, 0.67mW in 1.5cm, 1.75cm, 2cm amplitude of waves respectively. The knitted PVDF films energy harvester is 2.6-2.8 times greater than the multi-PVDF films type in generating energy. When weaving PZT films to a knit, this energy harvester can transform more wave energy into usable electric energy.