CAREER: Experimental Investigation of Highly Nonlinear Granular Crystals for the Development of New Mechanical Systems and Acoustic Metamaterials

职业：高度非线性颗粒晶体的实验研究，用于开发新的机械系统和声学超材料

• 批准号: 0844540
• 负责人: Chiara Daraio
• 金额: $ 40万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0844540&HistoricalAwards=false
• 关键词: CAREER; Experimental; Investigation; Highly; Nonlinear

The research objective of this Faculty Early Career Development (CAREER) project is creating and understanding new metamaterials based on engineered, ordered granular crystals. Metamaterials are artificially composite systems, having their fundamental components (for example spherical grains) arranged in precise geometrical structures, that present properties not found in other natural systems. It will study how stress waves propagate in these new materials with experiments, and will develop numerical and analytical models to predict their behavior. It will research wave behavior at interfaces and will study the interplay of discrete effects and periodicity, disorder and localization, creating parallels with other physical phenomena. The understanding provided by studying these new materials will allow the creation of novel devices like tunable acoustic lenses, vibration absorbers, energy traps and actuators.The societal impact of this work can be identified with the potential discovery of new systems that will affect everyday life (i.e. new acoustic methods for imaging/surgery, protective systems and signal transformation/redistribution in communication). It will also offer a great educational platform: creating and understanding new mechanical systems requires learning how to balance in depth fundamental physics with imagination, inspiring young generation to ?think out-of-the-box?. It will engage graduate, undergraduate, and high school students in several cooperative activities combining groundbreaking studies with the development of practical applications and patentable devices. It will particularly emphasize undergraduate education, motivating women and underrepresented groups toward science. The multidisciplinary aspects of this work will foster collaborations with other research institutions, with industry and with the broader community. The proposed plan will create two new academic courses and will organize summer schools with strong international emphasis.

该学院早期职业发展（CAREER）项目的研究目标是创建和理解基于工程有序颗粒晶体的新型超材料。超材料是人工复合系统，其基本成分（例如球形颗粒）排列成精确的几何结构，具有其他自然系统所没有的特性。它将通过实验研究应力波如何在这些新材料中传播，并将开发数值和分析模型来预测它们的行为。它将研究界面处的波行为，并将研究离散效应和周期性、无序性和局部化的相互作用，从而与其他物理现象产生相似之处。通过研究这些新材料所提供的理解将允许创建新颖的设备，如可调声学透镜、减振器、能量陷阱和执行器。这项工作的社会影响可以通过影响日常生活的新系统的潜在发现来确定（即用于成像/手术、保护系统和通信中的信号转换/重新分配的新声学方法）。它还将提供一个很好的教育平台：创建和理解新的机械系统需要学习如何平衡深度基础物理与想象力，激励年轻一代“跳出框框思考”。 它将让研究生、本科生和高中生参与多项合作活动，将突破性研究与实际应用和可专利设备的开发相结合。它将特别强调本科教育，激励女性和弱势群体走向科学。这项工作的多学科方面将促进与其他研究机构、行业和更广泛社区的合作。拟议的计划将开设两门新的学术课程，并将组织以国际为重点的暑期学校。