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Parametric Design Study of an Aeroelastic Flutter Energy Harvester

机译：气动弹振能量收集器的参数设计研究

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This paper investigates a novel mechanism for powering wireless sensors or low power electronics by extracting energy from an ambient fluid flow using a piezoelectric energy harvester driven by aeroelastic flutter vibrations. The energy harvester makes use of a modal convergence flutter instability to generate limit cycle bending oscillations of a cantilevered piezoelectric beam with a small flap connected to its free end by a revolute joint. The critical flow speed at which destabilizing aerodynamic effects cause self-excited vibrations of the structure to emerge is essential to the design of the energy harvester. This value sets the lower bound on the operating wind speed and frequency range of the system. A system of coupled equations that describe the structural, aerodynamic, and electromechanical aspects of the system are used to model the system dynamics. The model uses unsteady aerodynamic modeling to predict the aerodynamic forces and moments acting on the structure and to account for the effects of vortices shed by the flapping wing, while a modal summation technique is used to model the flexible piezoelectric structure. This model is applied to examine the effects on the cut-in wind speed of the system when several design parameters are tuned and the size and mass of the system is held fixed. The effects on the aeroelastic system dynamics and relative sensitivity of the flutter stability boundary are presented and discussed. Experimental wind tunnel results are included to validate the model predictions.
机译：本文研究了一种新颖的机制，该机制通过使用由气动弹性颤动振动驱动的压电能量收集器从周围的流体流中提取能量来为无线传感器或低功率电子设备供电。能量收集器利用模态会聚颤振的不稳定性来产生悬臂式压电梁的极限循环弯曲振荡，该悬臂式压电梁带有一个小翼片，该小翼片通过旋转接头连接到其自由端。不稳定的空气动力学效应导致结构自激振动出现的临界流速对于能量收集器的设计至关重要。此值设置系统的运行风速和频率范围的下限。描述系统结构，空气动力学和机电方面的耦合方程系统用于对系统动力学进行建模。该模型使用非稳态空气动力学模型来预测作用在结构上的空气动力和力矩，并考虑襟翼所散发的旋涡的影响，而模态求和技术则用于对柔性压电结构进行建模。当调整了几个设计参数并且系统的大小和质量保持固定时，该模型用于检查对切入风速的影响。提出并讨论了对气动弹性系统动力学和颤振​​稳定性边界的相对灵敏度的影响。实验风洞结果包括在内以验证模型预测。

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