넓은 영역에 대한 최대 및 강건 전압을 가진 PZT 압전 하베스터의 다구찌 설계

Abstract

The energy crisis is rapidly rising around the globe and eco-friendly technologies has been attracting much attention in recent years. Piezoelectric energy harvesting, one of eco-friendly technology, is gaining more interests of researchers due to its high power density. Among the various piezoelectric types, many studies have been conducted for the type of PZT-based piezoelectric cantilever beam. This is because it can easily obtain the resonance effect compared to other types. In real applications, however, it is not easy to match the loading frequency with the resonance frequency due to environmental factors. It is the factor preventing the application of piezoelectric energy harvesting to real life becausethe efficiency of energy extraction is extremely reduced outside the domain of resonance frequency. Therefore, in this study, the Taguchi design, which is effective methodology to improve the major functions, is performed to ensure that the robust output voltage can be taken to a high value in a wide range of frequency domain. The result of this study is based on the experimental data of PZT-based piezoelectric cantilever beam. The extracted voltage is obtained at the resonant frequency and several frequencies. Using the Taguchi design, the size of cantilever beam and PZT are designed to have the smallest variance and high mean voltage value.