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

摘要知识优势：振动在许多无线传感器应用领域中无处不在，并且已被广泛提出作为一种潜在的电源。振动能量采集器的一个持续问题是振动环境的具体参数与高效发电所需采集器的结构参数之间的紧密联系。实际上，大多数振动源都会随着时间的推移而变化，因此，一个能够适应振动环境的收割机可能会更有效地运行，并在各种工作环境中提供稳定的电源，就像电池一样。该bridge项目提出了一种通过控制duffing振荡器的非线性刚度函数来提供这种适应性的新方法。该研究旨在解决以下问题：在什么情况下闭环控制是有益的，以及在什么情况下非线性收集器的主动调谐优于线性收集器的主动调谐？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控制结构的最佳类型之间的关系，将为高效自适应振动能量收集器奠定基础。本研究产生的模型和数据将导致非线性收割机最优控制技术的进一步研究。更广泛的影响：无线传感器的能量收集领域是可访问的，并具有广泛的吸引力，跨越年龄组和技术复杂程度。利用这种兴趣，该项目将整合两项外展活动，其明确目标是扩大高中女生对工程职业的参与和兴趣。工程学院每年举办一次夏令营，旨在让年轻女性通过动手体验式学习接触各种工程职业。我们将开发一个模块，让学生设计、建造和测试一个简单的压电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集雕塑设计项目。在这项资助的第一年，主要研究者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/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.