Numerical simulations of aeroelastic instabilities to optimize the performance of flutter-based electromagnetic energy harvesters
Numerical simulations of aeroelastic instabilities to optimize the performance of flutter-based electromagnetic energy harvesters
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DOI：
10.1177/1045389x17711784
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发表时间：
2018-03-01
影响因子：
2.7
通讯作者：
Morgenthal, Guido
中科院分区：
文献类型：
--
作者：
Chawdhury, Samir;Morgenthal, Guido
本文提出了一个二维全耦合流固耦合模型，用于模拟气动弹性不稳定性，以评估和优化基于颤振的电磁能量采集器的性能。研究了T形悬臂梁系统的颤振型不稳定振动，作为小尺度能量转换的驱动机制。耦合的涡粒子法和结构求解器的基础上的共旋有限元公式的基础上的流动求解器，以准确地考虑这种非常灵活的元素的几何非线性效应。考虑电磁传感器产生的阻尼效应，对参考采集器进行了仿真。估算的颤振风速和预测的能量输出下不同的电阻被发现同意相当不错的参考风洞实验。研究了长度、厚度和悬臂尖端高度等物理参数对采集器性能的影响，包络体积为42 cm（3）。在8 m/s时，最大功率输出为5.3mW。优化的收获机在低风速下表现出更好的性能，在4 m/s时产生0.65mW，而参考收获机不产生功率。
The article presents a two-dimensional fully coupled fluid-structure interaction model for simulating aeroelastic instabilities to evaluate and optimize the performance of flutter-based electromagnetic energy harvesters. The flutter-type unstable vibration of T-shaped cantilever systems is investigated as a driving mechanism for small-scale energy conversion. A flow solver based on the vortex particle method and a structural solver based on a corotational finite element formulation are coupled in order to accurately account for the geometrically nonlinear effects of such very flexible elements. A reference harvester is simulated considering the damping effects arising from the electromagnetic transducer. The estimated flutter wind speed and the predicted energy outputs under different electrical resistances are found to agree reasonably well with reference wind tunnel experiments. The influence of physical parameters such as length, thickness, and cantilever tip height on the performance of the harvester is investigated up to an envelope volume of 42cm(3). The maximum power output is found to be 5.3mW at 8m/s. The optimized harvester shows a better performance under low wind speeds by producing 0.65mW at 4m/s where the reference harvester produced no power.