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Investigation on the energy trapping and conversion performances of a multi-stable vibration absorber

机译：多稳定减振器能量捕获和转化性能的研究

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摘要

Multi-stable energy harvesters have emerged as the most attractive candidates for vibration-based energy harvesting recently. Energy trapping and energy conversion are the main characteristics of a vibration-based energy harvester, similarly, energy absorption and damping dissipation are the main features of a conventional dynamic vibration absorber (DVA). Therefore, combination of vibration absorption and energy conversion is a potential strategy for vibration control and self-powered wireless sensors. This paper presents the principle design of tri-stable systems and mathematical modeling of a 2-dof tri-stable DVA and energy harvester. The energy harvesting performances of multi-stable energy harvesters in terms of tri-stable electromagnetic energy harvester (TEEH) and bi-stable electromagnetic energy harvester (BEEH) are evaluated under impulsive excitations and harmonic vibrations, respectively. The energy trapping capacity of TEEH is calculated under single impulsive excitation and compared with its counterpart of BEEH. Furthermore, the dynamic characteristics of the multi-stable DVA (tri-stable and bi-stable) are studied. Simulation results show that TEEH induces a more rapid attenuation in the residual kinetic energy of the primary system excited by a weak impulse than its counterpart of BEEH, and the trapped energy in TEEH increases remarkably with the application of a weak impulse. Compared with BEEH, the energy dissipation and harvesting performances of TEEH are more satisfactory under low-amplitude impulse and low mass ratio conditions. Additionally, the snap-through motion can be more easily triggered in TEEH under broadband and low-amplitude vibrations. With the increase in vibration amplitude, the multi-stable mechanism of TEEH can be readily understood through observing phase portrait and Poincare mapping, from which tri-stable state, chaotic attractors and bi-stable state are presented successively. Moreover, the energy harvesting efficiency of TEEH is more advanced under broadband ambient vibrations in comparison with BEEH. Finally, a prototype of tunable tri-stable system composed of a linear spring and magnetic spring is proposed.
机译：多稳定的能量收割机已成为最近振动的振动能量收获的最具吸引力的候选者。能量捕获和能量转换是基于振动的能量收割机的主要特点，类似地，能量吸收和阻尼耗散是传统动态振动吸收器（DVA）的主要特征。因此，振动吸收和能量转换的组合是振动控制和自动无线传感器的潜在策略。本文介绍了三-TOF三稳态DVA和能源收割机的三稳态系统和数学建模的原理设计。在三稳态电磁能量收割机（TEEH）和双稳态电磁能量收割机（BEEH）中分别在冲动激励和谐波振动下进行多稳态能量收割机的能量采伐。 TEEH的能量俘获能力在单一冲动激发下计算，并与其对照的蜂蜜蜂相比。此外，研究了多稳定DVA（三稳态和双稳态）的动态特性。仿真结果表明，TEEH在由弱脉冲的弱冲动激发的初级系统的残留动能中诱导更快的衰减，并且TEEH中的被捕获的能量显着随着弱脉冲的应用而增加。与BEEH相比，在低振幅脉冲和低质量比条件下，TEEH的能量耗散和收获性能更令人满意。另外，在宽带和低幅度振动下，可以更容易地在TEEH中触发卡通运动。随着振动幅度的增加，通过观察阶段肖像和庞的地图，可以容易地理解TEEH的多稳态机制，从中连续呈现三稳态，混沌吸引子和双稳态。此外，与Beeh相比，TEEH的能量收集效率在宽带环境振动下更先进。最后，提出了由线弹簧和磁性弹簧组成的可调谐三稳态系统的原型。

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