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: 1825969
• 负责人: Alireza Amirkhizi
• 金额: $ 25.16万
• 依托单位: University of Massachusetts Lowell
• 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 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1825969&HistoricalAwards=false
• 关键词: 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.

该项目的目标是利用微结构周期性材料的动态行为来精确定位声波的来源。传统的识别声源位置的方法是使用相控阵传感器，其精度受到传感器尺寸与声波波长的限制。本研究旨在利用周期性复合材料的振动特性来改进源位置的确定。所制定的原则将直接应用于雷达和相关的国防和民用技术。通过各种外展工作，这项研究将有助于扩大公众对海浪及其控制这一高度多学科课题的参与。水平斥力（LR）区是周期性微结构材料的状态随着控制参数（如波入射角）的微小变化而发生快速变化的频率区域。因此，它们可用于精确测量其控制参数，例如入射应力波的承载角。该项目的主要研究目标是：(a)确定声子特征值合并产生LR区域的条件，并利用这一点来证明声子晶体可以在LR区域附近作为极其敏感的方向传感器；(b)建立局域化的敏感度与LR区域的拓扑特性之间的关系，以便通过调制PC的几何或材料特性来创建可调谐/可调谐的LR区域；(c)创建实验室规模的声子晶体并证明LR区域的存在，随后验证所开发的声源定位方法在噪声和多声源环境中的精度和鲁棒性。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Exceptional points and scattering of discrete mechanical metamaterials

• DOI: 10.1140/epjp/s13360-022-02626-6
• 发表时间: 2020-12
• 期刊: The European Physical Journal Plus
• 作者: Weidi Wang;A. Amirkhizi

Overall dynamic properties of locally resonant viscoelastic layered media based on consistent field integration for oblique anti-plane shear waves

• DOI: 10.1016/j.mechmat.2021.103981
• 发表时间: 2021-04
• 作者: V. Alizadeh;A. Amirkhizi

Use of loss limit approach to zero in scattering-based parameter retrieval of elastic micro-structured media

• DOI: 10.1016/j.ijsolstr.2020.05.010
• 发表时间: 2020-09
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: R. Abedi;A. Amirkhizi

Angle-dependent phononic dynamics for data-driven source localization

用于数据驱动源定位的角度相关声子动力学

• DOI: 10.1121/10.0022325
• 发表时间: 2023
• 期刊: The Journal of the Acoustical Society of America
• 作者: Wang, Weidi;Mokhtari, Amir Ashkan;Srivastava, Ankit;Amirkhizi, Alireza V.
• 通讯作者: Amirkhizi, Alireza V.