This work deals with multidirectional and multimodal piezoelectric mechanical energy harvesters, proposing a star-shaped device composed by a tri-leg L-shaped structure with piezoelectric patches at six locations. Inertial pendular masses are strategically attached to the structure to harvest energy due to three-direction excitation sources. The device is modeled using finite element method and simulations are carried out to optimize the system design to operate in the required frequency range. System performance is investigated considering different ambient conditions including random excitations that represent the unavoidable source uncertainties. Results for in-plane and out-of-plane excitations show that the proposed device has potential to extract energy from multidirectional sources with a wideband frequency spectrum, serving as an alternative to conventional single-mode harvester with unidirectional sensitivity.

这项工作涉及多向和多模态压电机械能量收集器，提出了一种由三腿L组成的星形装置在六个位置具有压电贴片的形状结构。由于三个方向的激发源，惯性摆动质量战略性地附着在结构上以收集能量。该设备使用有限元方法建模，并进行仿真以优化系统设计以在所需的频率范围内运行。系统性能的研究考虑了不同的环境条件，包括代表不可避免的源不确定性的随机激励。平面内和平面外激励的结果表明，所提出的设备有可能从具有宽带频谱的多向源中提取能量，作为具有单向灵敏度的传统单模采集器的替代品。