Torsional vibration energy harvesting through transverse vibrations of a passively tuned beam
Torsional vibration energy harvesting through transverse vibrations of a passively tuned beam
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DOI：
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发表时间：
2017
影响因子：
4.6
通讯作者：
P. Alevras;S. Theodossiades;H. Rahnejat;T. Saunders
中科院分区：
文献类型：
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作者：
P. Alevras;S. Theodossiades;H. Rahnejat;T. Saunders
本文强调了以电力形式从机械系统中收集振动能量以激活远程电子设备的潜力。其主要思想是基于一个轻量级的振荡器的谐振响应，受到外部激励，与电动换能器（如压电材料，感应线圈）耦合。就机械系统而言，目的是当附件以相对高的振幅振动时最大化所收集的能量。这意味着系统固有频率应接近所施加（主体）振动的预期主频率。然而，在实践中，主振动频率由于系统不确定性而在有限范围内变化，或者由于主机结构的基本操作而在大的频带上变化，例如在具有速度变化的旋转动力传输系统中。最近，已经提出了引入非线性，以补偿小规模的频率偏移。然而，在大多数情况下，不能完全绕过必要的调谐效果，归因于系统动力学中的线性刚度分量。在本文中，旋转振动能量采集器概述，基于梁附件，耦合到电磁换能器。利用由于离心作用而产生的加强效应，以便被动地将附接调谐到旋转主结构的主频率。一个降阶模型的收获机，并评估其功率提取潜力。
The paper highlights the potential of harvesting vibration energy from mechanical systems in the form of electrical power to activate remote electronic devices. The principal idea is based upon the resonant response of a lightweight oscillator subjected to applied external excitation, coupled with an electrodynamic transducer (e.g. piezoelectric material, inductive coils). As far as the mechanical system is concerned, the aim is to maximize the harvested energy when an attachment vibrates with relatively high amplitudes. This means that the system natural frequency should be close to the expected dominant frequency of the applied (host) vibrations. However, in practice the dominant vibration frequency varies either within a limited range due to system uncertainties or across a large band due to the fundamental operation of the host structure, such as in rotational power transmission systems with speed variations. Recently, the introduction of nonlinearities has been proposed in order to compensate for small-scale frequency shifts. Nevertheless, in most cases one cannot fully bypass the necessary tuning effects, attributed to linear stiffness components in system dynamics. In this paper, a rotational vibration energy harvester is outlined, based upon a beam attachment, coupled with an electromagnetic transducer. The stiffening effect due to centrifugal action is utilized in order to passively tune the attachment to the dominant frequency of the rotational host structure. A reduced order model of the harvester is presented and its power extraction potential is assessed.