Energy Harvesting Under Combined Aerodynamic and Base Excitations
Energy Harvesting Under Combined Aerodynamic and Base Excitations
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DOI：
10.1115/smasis2012-7908
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
A. Bibo;M. Daqaq
中科院分区：
文献类型：
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作者：
A. Bibo;M. Daqaq
研究了一种压电弹性能量采集器在基础载荷和气动载荷联合作用下的转导问题。收割机由一个典型的刚性翼型，由硬化的弯曲和扭转弹簧支撑。翼型被放置在一个不可压缩的空气流动，并受到谐波基础激励在跳水方向。考虑非线性准定常气动模型，分析了在颤振失稳附近收割机的响应行为和电输出。采用中心流形约简，将原五维系统简化为一个非线性一阶常微分方程。在此基础上，推导了简化系统的范式，研究了电压幅值和相位的慢调制。几个案例研究表明，即使在空气速度低于颤振速度的情况下，即使在没有谐波基激励的情况下，收割机的输出电压也有相当大的改善。当基激励幅值足够大且频率接近颤振失稳产生的自持续极限环振荡频率时，基激励产生的周期解携带自持续振荡，产生周期输出电压。然而，当激励频率远离极限环频率，或基极激励幅值较小时，电压为两周期准周期。ASME版权所有©2012
This paper investigates the transduction of a piezoaeroelastic energy harvester under combined base and aerodynamic loadings. The harvester consists of a typical rigid airfoil supported by hardening flexural and torsional springs. The airfoil is placed in an incompressible air flow and subjected to a harmonic base excitation in the plunge direction. Considering a nonlinear quasi-steady aerodynamic model, the response behavior and electric output of the harvester are analyzed near the flutter instability. A center manifold reduction is implemented to reduce the original five-dimensional system into one nonlinear first-order ordinary differential equation. Subsequently, the normal form of the reduced system is derived to study slow modulation of the voltage amplitude and phase. Several case studies are presented indicating a considerable improvement in the output voltage of the harvester under the combined loading even when the air speed is below the flutter velocity, i.e., even when the harvester cannot maintain steady-state periodic oscillations in the absence of the harmonic base excitation. It is also shown that, when the base-excitation amplitude is sufficiently large and its frequency is close to the frequency of the self-sustained limit-cycle oscillations emanating from the flutter instability, the periodic solution resulting from the base excitation entrains the self-sustained oscillations yielding a periodic output voltage. However, when the excitation frequency is far from the limit-cycle frequency, or the amplitude of base excitation is small, the voltage is two-period quasiperiodic.Copyright © 2012 by ASME