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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.

这笔赠款将支持研究，以产生与机械谐振器相关的新知识，促进技术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量泄漏到周围结构而受到固有的限制，并且提供有限的或无法提供按需释放能量的手段。这项研究将介绍和研究一类人工工程结构，称为元结构，可以实现零能量泄漏。它还将研究通过施加力来限制和释放能量的可能性。这些新颖的机械谐振器将为基于弹性波的计算和信号处理开辟新的途径，并在机器人和物联网设备中具有潜在的应用。因此，这项研究的结果将有利于美国经济和社会。此外，伴随的教育和外展活动将有助于扩大代表性不足的群体对研究的参与，并对工程教育产生积极影响。这项研究将研究实现零泄漏、对缺陷不敏感并且可以使用元结构按需限制和释放能量的机械谐振器的可能性。当前的设计存在以下问题：它们将能量泄漏到周围结构中并且无法按需释放能量。该研究将通过从波动物理学的两项最新进展中汲取灵感来克服这些局限性：连续介质中的电磁束缚模式（BIC）和拓扑保护的弹性波能够实现对缺陷不敏感的能量传输。它将检验以下假设：利用色散表面的对称性和拓扑结构可以在弹性介质中产生受拓扑保护的 BIC。该研究将结合基于平面波展开法的分析计算、有限元分析的数值模拟以及使用激光多普勒振动测量法测量位移场对制造样品进行的实验测量。将介绍和研究日益复杂的元结构，即梁、板、壳和三维建筑实体。这项研究的结果适用于广泛的长度尺度，并将跨学科转化为声学、电磁和等离子体元结构。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。