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Enhancing power generation of piezoelectric bimorph device through geometrical optimization

Frontiers in Energy 2014年第1期8卷 129-137页

作者： action nechibvute Albert CHAWANDA Pearson LUHANGA Physics Department Midlands State University P/Bag 9055 GweruZimbabwe Physics Department University of Botswana P/Bag 0022 Gaborone Botswana

In this paper, it is demonstrated that the power output of a bimorph energy harvesting device can be significantly enhanced through geometrical optimization. The results of the study show that the maximum power is generated when the length of piezoelectric layer is 1/3 and the length of proof mass is 2/3 of the total device length. An optimized device with a total volume of approximately 0.5 cm3 was fabricated and was experimentally character- ized. The experimental results show that the optimized device is capable of delivering a maximum power of 1.33 mW to a matched resistive load of 138.4 kΩ, when driven by a peak mechanical acceleration of 1 g at the resonance frequency of 68.47 Hz. This is a very significant power output representing a power density of 2.65 mW/cm3 compared to the value of 200 9W/cm3 normally reported in literature.

关键词： geometrical optimization piezoelectric mate-rial bimorph energy harvesting power

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Discussion on Establishing a Metrology Standard for Vibration-Driven Energy Harvesting

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Journal of Energy and Power Engineering 2012年第5期6卷 674-682页

作者： Adekunle Rufus Akande action nechibvute Pearson Luhanga Physics Department University of Botswana Gaborone Gaborone Private Bag 00704 Botswana Physics Department Midlands State University Gweru Gweru Private Bag 9055 Zimbabwe

Energy harvesting is an area of substantial and increasing research attention, and vibration-based devices dominate this research. The primary goal of most researchers is producing maximum electrical output from the harvester systems. However, there have been little metrological considerations for circumstances under which the energy harvester devices are characterized. This makes comparison of different device prototypes very difficult. It is the focus of this paper to highlight the need for metrological considerations to energy harvesting so that a universal metric can be developed. An attempt is also made to discuss the critical parameters that are essential in establishing an international standard on vibration-based energy harvesting. Finally, a simple standard for energy harvesting is proposed.

关键词： Metrology standard energy harvesting metric vibration energy.

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