BRIGE: Adaptive Vibrational Energy Harvesting Systems through Semi-Passive Control of Nonlinear Oscillators

ECCS-1342070Roundy，ShadrachUtahBRIGE：通过非线性振荡器的半被动控制的自适应振动能量采集系统摘要智能优点：振动在许多无线传感器应用领域普遍存在，并已被广泛建议作为潜在的动力源。振动能量收割机的一个持续存在的问题是，振动环境的具体参数与高效发电所必需的收割机结构参数之间存在非常紧密的联系。事实上，大多数振动源会随着时间的推移而变化，因此，适应振动环境的收割机可能会像电池一样，在广泛的操作环境中更有效地运行并提供稳定的动力源。这座桥项目提出了一种通过控制Duffing振子的非线性刚度函数来提供这种适应性的新方法。这项研究试图解决以下问题：在什么情况下，闭环控制是有益的？在什么情况下，非线性收割机的主动调谐性能会优于线性收割机的主动调谐？了解闭环控制可以提供净功率增加的条件，以及输入振动特性与要控制的最佳结构类型之间的关系，将为高效自适应振动能量收集器奠定基础。这项研究产生的模型和数据将导致进一步研究非线性采集器的最优控制技术。广泛的影响：无线传感器的能量采集领域对年龄段和技术复杂程度的人来说是可以接触到的，并具有广泛的吸引力。利用这一兴趣，该项目将整合两项外展活动，明确目标是扩大高中年龄女学生对工程职业的参与和兴趣。工程学院赞助了一年一度的夏令营，旨在让年轻女性接触到各种工程职业，并亲身体验学习。将开发一个用于这个夏令营的模块，在这个夏令营中，学生们设计、制造和测试简单的压电式加速度计和能量收集器。第二项活动是为当地一所高中的本科生和学生赞助互动动能收获雕塑设计项目。在这笔拨款的第一年，首席调查员将监督雕塑项目作为高级设计课程的一部分，第二年他将在当地一所高中赞助该项目，作为工程学/艺术课的联合项目。雕塑设计有可能吸引有艺术头脑的学生，否则他们可能对工程和科学职业不感兴趣。

ECCS-1342070Roundy, ShadrachUniversity of UtahBRIGE: Adaptive Vibrational Energy Harvesting Systems through Semi-Passive Control of Nonlinear OscillatorsABSTRACTIntellectual Merit: Vibrations are ubiquitous in many wireless sensor application spaces, and have been widely proposed as a potential source of power. A continuing issue with vibration energy harvesters is the very tight linkage between the specific parameters of the vibration environment and the structural parameters of the harvester necessary for efficient power generation. In reality, most vibration sources change with time, and therefore a harvester that adapts to its vibration environment could potentially operate much more efficiently and provide a stable source of power over a broad range of operating environments as does a battery. This BRIGE project proposes a new method of providing such adaptability through control of the nonlinear stiffness function of duffing oscillators. The research seeks to address the following questions: under what circumstances is closed loop control beneficial, and under what circumstances will active tuning of a nonlinear harvester outperform active tuning of a linear harvester? Understanding the conditions under which closed loop control can provide a net increase in power and the relationship between the characteristics of input vibrations and the optimal type of structure to control will lay the groundwork for efficient adaptable vibration energy harvesters. The models and data generated by this research will lead to further work on optimal control techniques for nonlinear harvesters.Broader Impacts: The field of energy harvesting for wireless sensors is accessible to and has wide appeal across age groups and levels of technological sophistication. Leveraging that interest, this project will integrate two outreach activities with the express goal of broadening participation and interest in engineering careers among high school aged female students. The College of Engineering sponsors an annual summer camp designed to expose young women to a variety of engineering careers with hands-on experiential learning. A module will be developed for use in this camp in which students design, build, and test a simple piezoelectric accelerometer and energy harvester. The second activity is to sponsor interactive kinetic energy harvesting sculpture design projects for both undergraduate students and students at a local high school. During the first year of this grant, the principle investigator will supervise the sculpture project as part of the senior design course, and the following year he will sponsor the project at a local high school as a joint engineering / art class project. The sculpture design has the potential to engage artistically minded students who may not otherwise be interested in careers in engineering and science.