Towards Mechanical Resonators With Zero Leakage Using Elastic Metastructures

使用弹性超结构实现零泄漏机械谐振器

基本信息

批准号：
2027455
负责人：
Raj Kumar Pal
金额：
$ 31.22万
依托单位：
Kansas State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-01-01 至 2024-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2027455&HistoricalAwards=false
关键词：
Towards Mechanical Resonators Zero Leakage

项目摘要

This grant will support research to generate new knowledge related to mechanical resonators, promoting the frontiers of technology and advancing national prosperity. Examples of mechanical vibrators include communication devices, vibration isolators and energy harvesting devices. Existing resonators suffer from intrinsic limitations due to leakage of energy into the surrounding structure and offer limited or no means to release energy on demand. This research will introduce and investigate a class of artificially engineered structures, known as metastructures, that can achieve zero energy leakage. It will also investigate the possibility of confining and releasing energy by applying a force. These novel mechanical resonantors will open new avenues for elastic wave-based computation and signal processing, with potential applications in robotics and Internet of Things devices. Therefore, results from this research will benefit the U.S. economy and society. Furthermore, the accompanying educational and outreach activities will help broaden participation of underrepresented groups in research and positively impact engineering education.This research will investigate the possibility of achieving mechanical resonators that have zero leakage, are defect-insensitive and can confine and release energy on demand using metastructures. Current designs suffer from the fact that they leak energy into the surrounding structure and are unable to release energy on demand. The research will overcome these limitations by drawing inspiration from two recent advances in wave physics: the demonstration of electromagnetic bound modes in the continuum (BICs) and topologically protected elastic waves that enable defect-insensitive energy transport. It will test the hypothesis that exploiting the symmetry and topology of the dispersion surfaces can lead to topologically protected BICs in elastic media. The research will use a combination of analytical calculations based on the plane wave expansion method, numerical simulations using finite element analyses and experimental measurements on fabricated samples by using laser Doppler vibrometry to measure the displacement field. Metastructures of increasing complexity, i.e., beams, plates, shells and three-dimensional architected solids, will be introduced and investigated. The results of this research are applicable across a wide spectrum of length scales and will translate across disciplines to acoustic, electromagnetic and plasmonic metastructures.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该赠款将支持研究，以产生与机械谐振器有关的新知识，促进技术的前沿并促进国家繁荣。机械振动器的示例包括通信设备，振动隔离器和能量收集设备。现有的谐振器由于能源泄漏到周围的结构中遭受了内在限制，并提供有限或无需按需释放能量的方法。这项研究将介绍和研究一类人为工程的结构，称为元结构，这些结构可以实现零能量泄漏。它还将通过施加力来调查限制和释放能量的可能性。这些新型的机械谐振器将开辟基于弹性波的计算和信号处理的新途径，并在机器人和物联网设备中使用潜在的应用。因此，这项研究的结果将使美国经济和社会受益。此外，随之而来的教育和外展活动将有助于扩大代表性不足的群体参与研究和积极影响工程教育的参与。这项研究将调查实现零泄漏的机械谐振器的可能性，具有零泄漏，对缺陷不敏感，并且可以使用元结构对需求进行限制和释放能量。当前的设计遭受了这样的事实，即它们将能量泄漏到周围的结构中，并且无法按需释放能量。这项研究将通过从最新的波浪物理学进步中汲取灵感来克服这些局限性：连续体（BICS）中电磁界模式的演示以及拓扑受保护的弹性波，从而实现缺陷不敏感的能量运输。它将检验以下假设，即利用分散表面的对称性和拓扑结构可以导致弹性介质中受拓扑保护的BIC。该研究将基于平面波扩展方法，使用有限元分析的数值模拟以及通过使用激光多普勒振动法对置换样品进行实验测量的数值模拟，使用分析计算的组合。将引入和研究复杂性增加的元结构，即梁，板，壳和三维架构固体。这项研究的结果适用于各种长度尺度，并将跨学科转化为声学，电磁和等离子式元结构。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来获得支持的。