Collaborative Research: Accurate Determination of Acoustic Wave Sources using Periodic Microstructured Materials

合作研究：利用周期性微结构材料准确测定声波源

• 批准号: 1825354
• 负责人: Ankit Srivastava
• 金额: $ 23.75万
• 依托单位: Illinois Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1825354&HistoricalAwards=false
• 关键词: Collaborative; Research; Accurate; Determination; Acoustic; Collaborative; Research; Accurate; Determination; Acoustic

The goal of this project is to exploit the dynamic behavior of microstructured periodic materials to accurately locate the sources of sound waves. The traditional method of identifying source location is using phased array sensors whose precision is limited by the size of the sensor in comparison with the wavelength of acoustic waves. This research will aim to use the vibrational properties of periodic composites to improve determination of source location. The principles developed will have direct application to radar and associated technologies in both defense and civil applications. Through various outreach efforts, this research will help in broadening the participation of the public in the highly multi-disciplinary subject of waves and their control.Level Repulsion (LR) zones are frequency regions where the state of a periodic microstructured material undergoes rapid change in response to minute changes in a controlling parameter, e.g. wave incidence angle. Therefore they may be utilized for precise measurement of their controlling parameter, for example, the bearing angle of an incident stress wave. The principal research objectives of this project are: (a) To determine the conditions under which phononic eigenvalues coalesce to give rise to LR zones and to exploit this to demonstrate that phononic crystals can act as extremely sensitive directional sensors near LR zones; (b) To establish the relationships between the sensitivity of localization and the topological properties of LR zones in order to create tuned/tunable LR zones through modulations in the geometry or material properties of the PC; and (c) To create lab-scale phononic crystals and demonstrate the existence of LR zones, followed by verification of precision and robustness of the developed source localization methods in noisy and multisource environments.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目的目的是利用微结构周期材料的动态行为，以准确定位声波的来源。 传统的识别源位置的方法是使用阶段阵列传感器，与声波的波长相比，其精度受传感器的尺寸限制。这项研究的目的是利用周期性复合材料的振动特性来改善源位置的确定。 开发的原则将直接应用于国防和民事应用中的雷达和相关技术。 通过各种宣传工作，这项研究将有助于扩大公众在高度多学科的波浪及其控制中的参与。级别的排斥（LR）区域是频率区域，在这种情况下，周期性微结构材料的状态经历了对控制参数的微小变化的响应，经历了快速变化，例如。波入射角。因此，可以将它们用于精确测量其控制参数，例如，入射应力波的轴承角。该项目的主要研究目标是：（a）确定声音特征值合并产生LR区域的条件，并利用这一点以证明声音晶体可以充当LR区域附近极敏感的方向传感器； （b）建立定位敏感性与LR区域的拓扑特性之间的关系，以通过PC的几何形状或材料特性中的调制区域创建调谐/可调LR区域； （c）创建实验室的音调晶体并证明LR区域的存在，然后在嘈杂和多源环境中验证开发源定位方法的精确和鲁棒性。该奖项反映了NSF的法定任务，并通过使用基金会的知识优点和广泛影响来评估，并通过评估值得评估来证明，并被认为是值得的。