Diamagnetic-Levitation based Low-frequency Broadband Vibration Energy Harvester

本研究的目的是提供一种低频宽带能量采集器，作为监测结构的无线传感器供电的解决方案。初步研究已经证明了一个单稳态低频能量采集器使用抗磁悬浮（DL）。这种能量采集器的主要特点是其固有的非线性、弱恢复力和无机械摩擦。所提出的能量采集器是双稳态水平DL系统，其可以从所有三个方向上的输入加速度的范围经历大的周期性井间振荡和混沌运动。因此，该系统可以在宽带频率范围内提取比传统线性能量采集器多几个数量级的输出功率。这项研究还将涉及开发近-为了评估其在真实的环境振动中的性能，将对能量采集器和可充电电池进行优化和电源管理，并对样机进行实验室测试。许多工程应用。基本限制沿着与冲突的限制所施加的大小的收获机，转换效率的收获机和能量可用于功能的结构健康监测（SHM）系统将得到解决。一个显着的进步，在知识的能量收集使用非线性系统可以预期沿着创建一个框架，使用DL在民用，机械和航空航天工程应用作为一个系统的兴趣，没有机械阻尼持续最大效率。随着传感器和传感器网络技术的不断进步，所提出的研究将大大有助于开发真正自主和自我维持的SHM系统，用于监测基础设施。

The goal of this research is to provide a low-frequency broadband energy harvester as a solution to the powering of wireless sensors for monitoring structures. Preliminary studies have demonstrated a mono-stable low-frequency energy harvester using diamagnetic levitation (DL). The key features of this energy harvester are its inherent nonlinearity, weak restoring forces and absence of mechanical friction. The proposed energy harvester is a bi-stable horizontal DL system which can undergo large periodic inter-well oscillations and chaotic motions from a range of input accelerations in all three directions. Hence this system can extract output power orders of magnitude more than traditional linear energy harvesters in a broadband frequency range. This research will also involve developing near-optimal and power management solutions for integrating the energy harvester with rechargeable batteries and laboratory tests of the prototypes will be performed to evaluate its performance in real ambient vibrations.A promising high efficiency energy harvesting system with no apparent mechanical friction and a wide bandwidth in the low frequency range is envisioned to completely cater to the needs of energy harvesting for many engineering applications. Fundamental limits along with conflicting constraints imposed by the size of the harvester, transduction efficiency of the harvester and the energy available for the functioning of the structural health monitoring (SHM) systems will be addressed. A significant advancement in the knowledge of energy harvesting using nonlinear systems can be expected along with creating a framework for using DL in civil, mechanical, and aerospace engineering applications as an interest for systems with no mechanical damping persists for maximum efficiency. With the on-going advances in sensors and sensor network technologies, the proposed research will contribute greatly to the development of truly autonomous and self-sustained SHM systems for monitoring infrastructures.