International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2023-05-19 , DOI: 10.1016/j.ijmecsci.2023.108481 Jianwei Zhang, Mengyao Wu, Haofeng Wu, Shuaimin Ding
In order to enhance the performance of bistable energy harvesters with dielectric elastomers (DEs) under ultra-low frequency vibrations, this paper proposes an asymmetric bistable vibro-impact dielectric elastomer generator (ABVI DEG), which mainly consists of a vibro-impact (VI) DEG, two identical pre-compressed springs, two pairs of undeformed springs, and a base. Two kinds of dynamics models of the proposed energy harvester under ultra-low frequency harmonic excitations are developed, and the instantaneous impact model is selected due to its computational efficiency and accuracy. The instantaneous impact model is extended by a series of impact experiments and validated by comparing the dynamical responses of the proposed energy harvester obtained from the two kinds of dynamics models. On this basis, the dynamical behavior and the energy harvesting (EH) performance of the proposed energy harvester under ultra-low frequency harmonic excitations are studied for the initial conditions of the system, different bistable potential wells, and various parameters, which include the pre-stretched ratio of the membranes and the distance between the two membranes. A further comparative study demonstrates the superiority of the proposed energy harvester under the ultra-low frequency harmonic excitation. This work not only provides an insight into dynamical behavior of the proposed ABVI DEG, but helps guide the design and optimization of the proposed EH system in the ultra-low frequency vibration environment.
中文翻译:
用于增强超低频振动能量收集的非对称双稳态振动冲击 DEG
为了提高具有介电弹性体(DEs)的双稳态能量收集器在超低频振动下的性能,本文提出了一种非对称双稳态振动冲击介电弹性体发电机(ABVI DEG),其主要由振动冲击(VI ) DEG,两个相同的预压弹簧,两对未变形的弹簧,和一个底座。开发了超低频谐波激励下所提出的能量收集器的两种动力学模型,由于其计算效率和准确性,选择了瞬时冲击模型。瞬时冲击模型通过一系列冲击实验得到扩展,并通过比较从两种动力学模型获得的所提出的能量收集器的动力学响应来验证。以这个为基础,针对系统的初始条件、不同的双稳态势阱和各种参数,研究了所提出的能量收集器在超低频谐波激励下的动力学行为和能量收集 (EH) 性能,其中包括膜和两个膜之间的距离。进一步的比较研究证明了所提出的能量收集器在超低频谐波激励下的优越性。这项工作不仅提供了对所提出的 ABVI DEG 动力学行为的深入了解,而且有助于指导所提出的 EH 系统在超低频振动环境中的设计和优化。