E型梁结构尾涡振动式压电流体俘能器的分析与试验

Analysis and experiment of vortex-shedding induced vibration piezoelectric fluid energy harvester with E-beam structure

在真实的管道应用场景中,压电流体俘能器需具备较宽的工作频带,以便适应复杂多变的流场环境。针对该需求,本文提出了一种新型尾涡振动式压电流体俘能器。俘能器主体采用E型梁结构,该结构主要由起振板、主梁和两个副梁共同构成,通过调节起振板和副梁尾端的质量块,可使俘能器的前三阶谐振频率相互靠近从而实现俘能频带拓宽和可调。本研究采用建模仿真和试验的方法,分析所提出俘能器的振动特性、输出性能以及水下真实环境中的工作性能。研究结果表明,所提出的基于E型梁结构的尾涡振动式压电流体俘能器具备结构紧凑、空间和能量利用率高、宽频带和频带可调、可多梁同时高效工作的能力,当水的流速为0.55m/s时,俘能器的最大输出功率为115μW。相关结果可为阵列式流体俘能技术的研究和发展提供了参考。

In real pipeline application scenarios, the piezoelectric fluid energy harvester should have the characteristics of wide frequency band to adapt to the complex and changeable flow field environment. For this demand, a new type of vortex-shedding induced vibration piezoelectric fluid energy harvester was proposed. The main body of the harvester adopts E-beam structure, which is mainly composed of a flapping sheet, a main beam and two auxiliary beams. By adjusting the mass of the flapping sheet and the end of the auxiliary beam, the first three resonant frequencies of the energy harvester can be close to each other, so that the frequency band can be widened and adjusted. To analyze the vibration characteristics, output performance and working performance in real underwater environment, the modeling simulation and experimental methods were used in this study. The results show the proposed harvester has compact structure, high space utilization, broadband and adjustable frequency band, and the ability to work efficiently with multiple beams at the same time. The maximum output power of the energy harvester can reach 115 μW when the water flow rate is 0.55 m/s. This energy harvester provides a new reference for the research and development of array fluid energy harvest technology.