DynSyst_Special_Topics: Collaborative Research: Fundamental and Applied Dynamics of Granular Crystals: Disorder, Localization and Energy Harvesting

DynSyst_Special_Topics：合作研究：颗粒晶体的基础和应用动力学：无序、局域化和能量收集

• 批准号: 0969541
• 负责人: Chiara Daraio
• 金额: $ 18.73万
• 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: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0969541&HistoricalAwards=false
• 关键词: DynSyst_Special_Topics; Collaborative; Research; Fundamental; Applied

The research objective of the present proposal is to study nonlinear waveforms that may arise in granular crystals, including traveling waves, defect modes, and discrete breathers. It also intends to provide a roadmap for identifying when these different structures will arise, systematically building up in complexity, from monomer lattices, to dimmer, trimmer and heterogeneous ones, and from one- to multiple-defect chains and even random lattices. Granular crystals consist of chains of interacting particles that deform elastically when they collide. Their properties (material types, sizes, shapes) are extremely tunable and their dynamic response may be modified to be weakly or strongly nonlinear. The project will involve a fruitful cross-pollination of tools and methods from dynamical systems, nonlinear ordinary and partial differential equations, asymptotic analysis and numerical computation on the theoretical side. These will be interwoven with physical experiments that will attempt to excite and identify the relevant nonlinear waves and to investigate their properties (amplitude, width, energy, lifetime, interactions, higher-dimensional analogs etc.). A continuous feedback loop between mathematical theory, numerical simulation and physical experimentation will be the driving force of the study.It is anticipated that this project will have a significant societal impact due to the potential discovery of mechanical systems that may affect aspects of everyday life. In particular, localized modes will be studied for potential use in energy harvesting systems, delay lines and shock protective or vibration absorption materials. Additionally, the relevant effort will involve student researchers with a vigorous educational component including both formal (associated with coursework and research conferences) and informal (inter-group exchanges and visits) educational opportunities. It will bring together students from fundamentally different backgrounds (mathematics and aeronautical/aerospace engineering) providing them with a rich interdisciplinary experience that will offer an excellent framework for learning and scientific exchange/collaboration. The program will also foster collaborations between the two institutions, but also with other Universities (Oxford University in the UK, Princeton University and the University of Athens). We expect that several conference presentations, journal articles and patent applications will emerge from this study.

本提案的研究目标是研究可能在颗粒状晶体中出现的非线性波形，包括行进波，缺陷模式和离散的呼吸器。它还打算提供一个路线图，以确定何时出现这些不同的结构，从单体晶格到调光，修剪器和异质性，从单体晶格以及从一体到多缺陷的链到随机的晶格，从单体晶格到调光，修剪器和异质。颗粒晶体由相互作用的颗粒的链组成，这些颗粒碰撞时会弹性变形。它们的性质（材料类型，尺寸，形状）非常可调，并且它们的动态响应可能会被修改为弱或强烈的非线性。该项目将涉及动态系统，非线性普通和部分微分方程，渐近分析和理论方面的数值计算的工具和方法的富有成果的交叉授粉。这些将与物理实验交织在一起，这些实验将试图激发和识别相关的非线性波并研究其特性（幅度，宽度，能量，寿命，相互作用，较高维度类似物等）。数学理论，数值模拟和物理实验之间的持续反馈回路将是研究的驱动力。预计由于可能发现可能影响日常生活方面的机械系统的潜在发现，因此该项目将对社会产生重大影响。特别是，将研究局部模式，以便在能源收集系统，延迟线和防震或振动吸收材料中使用。此外，相关的工作将涉及具有强大的教育组成部分的学生研究人员，包括正式（与课程和研究会议相关）以及非正式的教育机会（群体间交流和访问）。它将从根本不同的背景（数学和航空/航空工程）中汇集学生，为他们提供丰富的跨学科体验，为学习和科学交流/协作提供了绝佳的框架。该计划还将促进两个机构之间的合作，以及与其他大学（英国牛津大学，普林斯顿大学和雅典大学）。我们预计这项研究将出现一些会议演讲，期刊文章和专利申请。