Negative Refraction and Localized Resonance of Guided Elastic Waves

导弹性波的负折射和局域共振

• 批准号: 1335426
• 负责人: Todd Murray
• 金额: $ 27.93万
• 依托单位: University of Colorado at Boulder
• 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: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1335426&HistoricalAwards=false
• 关键词: Negative; Refraction; Localized; Resonance; Guided

The research objective of this award is to study backward wave propagation in elastic waveguides and how it can be harnessed to create novel acoustic wave devices and improved nondestructive evaluation techniques. The research approach is to determine the conditions under which backward waves exist in plates and thin films, and how to efficiently control wave propagation through mode conversion between forward and backward propagating waves at interfaces. Backward wave propagation can lead to non-intuitive physical effects such as negative refraction and negative reflection of elastic waves and localized resonances. Experimental measurements and computational modeling will be used to design and evaluate surface acoustic and plate wave lenses based on negative refraction, and to assess the potential for using negative reflection and localized resonances for the nondestructive evaluation of thin films and plates.If successful, this research will lead to a new approach for manipulating guided elastic waves by controlling the surface profile of waveguides. Structures supporting guided elastic waves are commonplace and the results of the proposed research offer potential improvements to the nondestructive evaluation of aircraft, pipelines, and critical electronic components. Backward wave propagation could prove to be an enabling technology, offering a fundamentally new approach for the design of a wide range of acoustic devices including resonators, filters, and lenses. It could also have an impact on a broad range of fields that incorporate elastic wave propagation, from seismology to energy harvesting. The research will support advanced training for undergraduate and graduate students, and an education program will be developed where high school and undergraduate students are introduced to nondestructive testing through hands-on laboratory work.

该奖项的研究目标是研究弹性波导中的后向波传播，以及如何利用它来创建新型声波器件和改进的无损评估技术。研究方法是确定在板和薄膜中存在后向波的条件，以及如何通过界面处前向和后向传播波之间的模式转换来有效地控制波的传播。后向波传播会导致非直观的物理效应，例如弹性波的负折射和负反射以及局部共振。实验测量和计算建模将用于设计和评估基于负折射的表面声波和板波透镜，并评估使用负反射和局部共振的薄膜和plate.If成功的无损评价的潜力，这项研究将导致一个新的方法操纵引导弹性波通过控制波导的表面轮廓。结构支撑的弹性导波是司空见惯的，所提出的研究结果提供了潜在的改进飞机，管道和关键电子元件的无损评估。反向波传播可以被证明是一种使能技术，为设计包括谐振器、滤波器和透镜在内的各种声学设备提供了一种全新的方法。它还可能对从地震学到能量收集等包含弹性波传播的广泛领域产生影响。该研究将支持本科生和研究生的高级培训，并将制定一项教育计划，通过动手实验室工作向高中和本科生介绍无损检测。