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Nonlinear and Adaptive Acoustic Metamaterials for Novel Wave-Based Devices

用于新型波基器件的非线性和自适应声学超材料

基本信息

批准号：
1332862
负责人：
Michael Leamy
金额：
$ 39.1万
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：
2013
资助国家：
美国
起止时间：
2013-10-01 至 2018-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1332862&HistoricalAwards=false
关键词：
Nonlinear Adaptive Acoustic Metamaterials Novel

项目摘要

The research objective of this award is to investigate nonlinear acoustic metamaterials with adaptive properties for the design of next-generation wave-based devices. The necessary nonlinear interactions and adaptivity will be derived from two primary material systems: one based on controllable post-buckled lattices, and the other based on piezoelectric tunable metamaterials. The research will also exploit large deformations resulting from structural instabilities as an effective way to adapt the topology and the periodicity of a structured material. Stiffening and softening effects, amplitude-dependent dispersion, and stability will be studied in terms of their effect on the wave guiding characteristics. Fundamental understanding of nonlinear and adaptive acoustic metamaterials, and the exploration of their wave propagation behavior, will support the conception, fabrication, and experimental testing of innovative wave-based devices, to include tunable filters, waveguides, acoustic diodes, noise isolators, and directed-energy systems. If successful, the results of this research will significantly advance knowledge and understanding in the general area of tunable and adaptive nonlinear metamaterials. This understanding will be important for the development of innovative devices for use in communication systems (mobile phones, GPS units, etc.), noise isolation, energy redirection, and acoustic filters, logic ports and switches. Advances from the research topics will be disseminated widely through academic courses on wave mechanics at Georgia Tech and in undergraduate research opportunities. Broadening of participation will be achieved by specifically working with underrepresented students through ongoing programs available at Georgia Tech. In addition, educational laboratory activities and classroom modules, developed in partnership with the GIFT program at Georgia Tech, will expose high school and middle school underrepresented students to basic results of the research and to underlying wave mechanics principles.

该奖项的研究目标是研究具有自适应特性的非线性声学超材料，用于设计下一代基于波的设备。所需的非线性相互作用和自适应性将来自两个主要的材料系统：一个基于可控的后屈曲晶格，另一个基于压电可调超材料。这项研究还将利用结构不稳定性导致的大变形作为适应结构材料的拓扑和周期性的有效方法。硬化和软化效应、幅度相关色散和稳定性将根据它们对波导特性的影响进行研究。对非线性和自适应声学超材料的基本了解，以及对其波传播行为的探索，将支持创新的基于波的器件的概念、制造和实验测试，包括可调谐滤波器、波导、声学二极管、噪声隔离器和定向能系统。如果成功，这项研究的结果将极大地促进对可调和自适应非线性超材料的一般领域的认识和理解。这一认识对于开发用于通信系统(移动电话、GPS单元等)、噪音隔离、能量重定向以及声学过滤器、逻辑端口和开关的创新设备将是重要的。研究课题的进展将通过佐治亚理工学院关于波浪力学的学术课程和本科生的研究机会广泛传播。通过佐治亚理工学院正在进行的项目，专门与代表性不足的学生合作，将实现更广泛的参与。此外，与佐治亚理工学院GIFT计划合作开发的教育实验室活动和课堂模块将使未被充分代表的高中和初中学生接触到研究的基本结果和潜在的波浪力学原理。