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A novel bistable energy harvesting concept

机译：一种新颖的双稳态能量收集概念

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摘要

Bistable energy harvesting has become a major field of research due to some unique features for converting mechanical energy into electrical power. When properly loaded, bistable structures snap-through from one stable configuration to another, causing large strains and consequently power generation. Moreover, bistable structures can harvest energy across a broad-frequency bandwidth due to their nonlinear characteristics. Despite the fact that snap-through may be triggered regardless of the form or frequency of exciting vibration, the external force must reach a specific snap-through activation threshold value to trigger the transition from one stable state to another. This aspect is a limiting factor for realistic vibration energy harvesting application with bistable devices. This paper presents a novel power harvesting concept for bistable composites based on a 'lever effect' aimed at minimising the activation force to cause the snap through by choosing properly the bistable structures' constraints. The concept was demonstrated with the help of numerical simulation and experimental testing. The results showed that the actuation force is one order of magnitude smaller (3%-6%) than the activation force of conventionally constrained bistable devices. In addition, it was shown that the output voltage was higher than the conventional configuration, leading to a significant increase in power generation. This novel concept could lead to a new generation of more efficient bistable energy harvesters for realistic vibration environments.
机译：由于将机械能转换为电能的某些独特功能，双稳态能量收集已成为研究的主要领域。正确加载后，双稳态结构会从一种稳定的配置快速过渡到另一种，从而导致较大的应变，进而导致发电。而且，双稳态结构由于其非线性特性，可以在较宽的频率范围内收集能量。尽管事实上无论激振的形式或频率如何都可能触发快速捕捉，但外力必须达到特定的快速捕捉激活阈值才能触发从一种稳定状态到另一种稳定状态的转变。这方面是使用双稳态设备进行实际振动能量收集应用的限制因素。本文提出了一种基于“杠杆效应”的双稳态复合材料新的功率收集概念，旨在通过适当选择双稳态结构的约束来最大程度地减小激活力，从而引起快速断裂。借助数值模拟和实验测试证明了这一概念。结果表明，驱动力比常规约束双稳态装置的驱动力小一个数量级（3％-6％）。另外，显示出输出电压高于常规配置，导致发电量显着增加。这个新颖的概念可能会导致针对现实振动环境的新一代更高效的双稳态能量收集器。

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