This Letter presents a rotational impact energy harvester by utilizing the centrifugal softening effect of an inverted driving beam in improving the energy harvesting performance of two piezoelectric beams at low rotational frequencies. By our proposed structure, the static divergence of the inverted driving beam in the deflected mode can not only be avoided but also be utilized. Numerical and experimental results show that the centrifugal softening effect can amplify the relative motion between the driving and generating beams and increase the impact force, which in turn improves the output power significantly. The maximum output power of the harvester is increased by 212.5%, 258.7%, and 682.8% for the impact gaps of 1.07 mm, 1.43 mm, and 2.14 mm, respectively. Moreover, the inverted driving beam can be prevented from continuously deflecting by introducing large impact stiffness at the contact instant.

中文翻译：

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利用离心软化效应在旋转冲击能量收集中的优势

本文介绍了一种旋转冲击能量收集器，它利用倒置驱动梁的离心软化效应来提高两个压电梁在低旋转频率下的能量收集性能。通过我们提出的结构，不仅可以避免而且可以利用偏转模式下反向驱动光束的静态发散。数值和实验结果表明，离心软化效应可以放大驱动梁和产生梁之间的相对运动，增加冲击力，从而显着提高输出功率。对于1.07 mm、1.43 mm和2.14 mm的冲击间隙，收割机的最大输出功率分别提高了212.5%、258.7%和682.8%。而且，