This paper proposes a softening nonlinear aeroelastic galloping energy harvester for enhanced energy harvesting from concurrent wind flow and base vibration. Traditional linear aeroelastic energy harvesters have poor performance with quasi-periodic oscillations when the base vibration frequency deviates from the aeroelastic frequency. The softening nonlinearity in the proposed harvester alters the self-excited galloping frequency and simultaneously extends the large-amplitude base-excited oscillation to a wider frequency range, achieving frequency synchronization over a remarkably broadened bandwidth with periodic oscillations for efficient energy conversion from dual sources. A fully coupled aero-electro-mechanical model is built and validated with measurements on a devised prototype. At a wind speed of 5.5 m/s and base acceleration of 0.1 g, the proposed harvester improves the performance by widening the effective bandwidth by 300% compared to the linear counterpart without sacrificing the voltage level. The influences of nonlinearity configuration, excitation magnitude, and electromechanical coupling strength on the mechanical and electrical behavior are examined. The results of this paper form a baseline for future efficiency enhancement of energy harvesting from concurrent wind and base vibration utilizing monostable stiffness nonlinearities.

本文提出了一种软化非线性气动弹性疾驰能量收集器，用于从并发风流和基础振动中增强能量收集。当基础振动频率偏离气动弹性频率时，传统的线性气动弹性能量采集器的性能较差，准周期振荡。所提出的收割机中的软化非线性改变了自激振荡频率，同时将大振幅基激振荡扩展到更宽的频率范围，在显着加宽的带宽上实现频率同步，周期性振荡实现双源的高效能量转换。建立一个完全耦合的航空机电模型，并通过对设计原型的测量进行验证。在 5.5 m/s 的风速和 0.1 g 的基础加速度下，与线性对应物相比，所提议的收集器通过将有效带宽扩大 300% 来提高性能，而不会牺牲电压电平。检查了非线性配置、激励幅度和机电耦合强度对机械和电气行为的影响。本文的结果为未来利用单稳态刚度非线性从并发的风和基础振动中收集能量形成了一个基线。