Energy harvesting from underwater base excitation of a piezoelectric composite beam
Energy harvesting from underwater base excitation of a piezoelectric composite beam
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DOI：
10.1088/0964-1726/22/11/115026
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发表时间：
2013-11-01
影响因子：
4.1
通讯作者：
Porfiri, Maurizio
中科院分区：
文献类型：
--
作者：
Cha, Youngsu;Kim, Hubert;Porfiri, Maurizio
在本文中，我们研究了压电复合梁水下基础激励的能量收集。通过实验研究了四种不同的几何配置，其中梁要么完全浸没，要么部分浸没，其长度的八分之一、四分之一或一半在水下振动。基础激励的频率和幅度随着分流电阻而系统地变化，以研究从水下振动中收集压电能量的原理。结果表明，增加湿长度会导致水下振动的共振频率和品质因数持续降低。另一方面，随着浸没长度的增加，收获的功率通常会降低。实验结果通过分布式压水弹性模型进行解释，该模型考虑了附加质量和非线性流体动力阻尼效应。进一步建立降阶模态模型，以参数化方式探索各种几何和物理参数的系统响应。
In this paper, we investigate energy harvesting from underwater base excitation of a piezoelectric composite beam. Four different geometric configurations are experimentally studied in which the beam is either fully submerged or is partially immersed, with an eighth, a quarter, or a half of its length vibrating underwater. The frequency and the amplitude of base excitation are systematically varied along with the shunting resistance to investigate the principles of piezoelectric energy harvesting from underwater vibrations. Results demonstrate that increasing the wet length produces a consistent reduction of the resonance frequency and the quality factor of underwater vibrations. On the other hand, the harvested power is found to generally decrease as the submersion length is increased. Experimental results are interpreted through a distributed piezohydroelastic model that accounts for added mass and nonlinear hydrodynamic damping effects. A reduced order modal model is further established to parametrically explore the system response across a variety of geometrical and physical parameters.