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EFRI NewLAW: Non-reciprocity in Acoustic Systems with Nonlinear Hierarchical Internal Structure and Asymmetry

EFRI NewLAW：具有非线性分层内部结构和不对称性的声学系统中的非互易性

基本信息

批准号：
1741565
负责人：
Michael Leamy
金额：
$ 200万
依托单位：
Georgia Tech Research Corporation
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2022-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1741565&HistoricalAwards=false
关键词：
EFRI NewLAW Non reciprocity Acoustic

项目摘要

This research program will investigate new theoretical and practical knowledge on the application of nonlinearity, asymmetry, and mixed scales to design and fabricate ground-breaking materials and devices. The approach will yield materials which overcome traditional bounds on time-reversal symmetry and acoustic reciprocity. These transformative reciprocity-breaking materials and systems are expected to find wide application in diverse fields, including noise-mitigating transportation systems; medical ultrasound devices; atomic force microscope (AFM) sensing; acoustic filters and logic devices; sonar; and energy control and redirection. The research will also broadly impact education through planned curriculum development and outreach activities aimed at increasing exposure of engineering students, and the public, to the exciting physics of acoustic materials. At the same time, these activities will promote interest in science, technology, engineering, and mathematics. Planned activities will include a multidisciplinary collaborative course on non-traditional acoustic materials; broadening opportunities with outreach organizations on campus by inviting high school students and teachers to develop lab modules and earn continuing education credits; a collaboration with Clark Atlanta University to engage faculty and underrepresented undergraduate students in research tasks; and industrial collaboration with the Hughes Research Laboratory to enhance and facilitate technology transfer.This research investigates a new class of reciprocity-breaking acoustic systems characterized by nonlinear internal structures, asymmetry and mixed scales. These systems exhibit directed cross-scale energy transfers which break time reversibility and reciprocity both locally (within each of the system subunits) and globally (for the entire system viewed a whole). Non-reciprocal, large-to-small scale energy transfers mimic analogous nonlinear energy transfer cascades in nature (e.g., turbulence). The research aims to be transformative in the field of nonlinear acoustics, promoting a new paradigm for predictive design with nonlinear non-reciprocity through (i) the theoretical and experimental understanding of acoustic systems with nonlinear hierarchical internal structures; (ii) the uncovering of the combined role of asymmetry, disorder, nonlinearity and cross-scale directed energy transfers on non-reciprocity; (iii) the development of new approaches for fabricating, characterizing and experimentally testing non-reciprocal lattice materials combining multiple macro-to-nano scales; and (iv) the translation of these materials to new technologies and acoustic devices that exploit and showcase transformative capabilities.

本研究计划将探讨新的理论和实践知识的非线性，不对称性和混合尺度的应用，设计和制造突破性的材料和设备。该方法将产生克服传统的时间反演对称性和声学互易性界限的材料。这些变革性的破坏互易性的材料和系统预计将在不同的领域中得到广泛的应用，包括降噪运输系统;医疗超声设备;原子力显微镜（AFM）传感;声学滤波器和逻辑设备;声纳;以及能量控制和重定向。该研究还将通过计划的课程开发和推广活动广泛影响教育，旨在增加工程专业学生和公众对声学材料令人兴奋的物理学的接触。同时，这些活动将促进对科学，技术，工程和数学的兴趣。计划的活动将包括：关于非传统声学材料的多学科协作课程;通过邀请高中学生和教师开发实验室模块并获得继续教育学分，扩大与校园外联组织的机会;与克拉克亚特兰大大学合作，让教师和代表人数不足的本科生参与研究任务;本研究探讨一类新的互易性破坏声学系统，其特征在于非线性内部结构、不对称性和混合尺度。这些系统表现出直接的跨尺度能量转移，打破了时间可逆性和互易性本地（每个系统子单元内）和全球（整个系统视为一个整体）。非互惠的、大规模到小规模的能量转移模拟了自然界中类似的非线性能量转移级联（例如，湍流）。该研究旨在非线性声学领域的变革，通过（i）对具有非线性分层内部结构的声学系统的理论和实验理解，（ii）揭示非对称性，无序性，非线性和跨尺度定向能量转移对非互易性的综合作用，（iii）促进非线性非互易性预测设计的新范式。（iii）开发新方法，用于制造、表征和实验测试结合多种宏观到纳米尺度的非互易晶格材料;以及（iv）将这些材料转化为利用和展示变革能力的新技术和声学设备。