Broadband energy harvesting using acoustic black hole structural tailoring
Broadband energy harvesting using acoustic black hole structural tailoring
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DOI：
10.1088/0964-1726/23/6/065021
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发表时间：
2014-06
影响因子：
4.1
通讯作者：
Liuxian Zhao;S. Conlon;F. Semperlotti
中科院分区：
文献类型：
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作者：
Liuxian Zhao;S. Conlon;F. Semperlotti
本文探讨了声学黑洞（ABH）的概念，作为一个主要的设计框架进行动态结构剪裁的机械系统振动能量收集应用。ABH是嵌入在主体结构中的整体特征，其允许相速度的平滑减小，理论上接近于零，同时使反射能量最小化。这种机制导致具有高能量密度的结构区域，可以有效地利用这些结构区域来开发增强的基于振动的能量收集。建立了ABH锥形结构的机电耦合模型，对系统在稳态和瞬态激励下的响应进行了数值模拟。的设计性能进行了数值评估，使用结构强度数据，以及瞬时电压/功率和能量输出所产生的压电换能器网络。结果表明，动态定制的结构设计，使收获的能量相比，传统的结构，无论是在稳态和瞬态激励条件下急剧增加。
This paper explores the concept of an acoustic black hole (ABH) as a main design framework for performing dynamic structural tailoring of mechanical systems for vibration energy harvesting applications. The ABH is an integral feature embedded in the host structure that allows for a smooth reduction of the phase velocity, theoretically approaching zero, while minimizing the reflected energy. This mechanism results in structural areas with high energy density that can be effectively exploited to develop enhanced vibration-based energy harvesting. Fully coupled electro-mechanical models of an ABH tapered structure with surface mounted piezo-transducers are developed to numerically simulate the response of the system to both steady state and transient excitations. The design performances are numerically evaluated using structural intensity data as well as the instantaneous voltage/power and energy output produced by the piezo-transducer network. Results show that the dynamically tailored structural design enables a drastic increase in the harvested energy as compared to traditional structures, both under steady state and transient excitation conditions.