MRI: Acquisition of a High-Speed Digital Image Correlation System for Research and Education

该主要研究仪器（MRI）奖支持获取三维（3D）高速数字图像相关（DIC）系统，该系统提供三维全场非侵入式变形、振动和应变测量。该仪器将使新的研究、教育和推广活动以及大学、工业和国家实验室之间的合作成为可能。关键部件和基础设施的结构健康监测研究可以提高飞机和建筑物的公共安全。对非线性波传播的更好理解可以为超材料带来新的传感能力——为增强的医疗设备、更高效的制造系统和更复杂的娱乐系统铺平道路，并激发数据加密和损伤检测的新技术。该仪器将被纳入各种本科和研究生课程，Meyerhoff学者计划和K-12外展活动的学生将有机会使用该仪器。3D高速DIC系统将使研究人员能够解决动态系统中的挑战性问题，例如非线性波传播和超材料、结构健康监测、流固耦合（FSI）、非线性动力学和热模态参数识别。需要解决的基本知识差距包括非线性晶格中振幅相关色散位移和波动稳定性的实验表征，基于夹层板的损伤敏感振动方法的开发，以及具有同时流动和结构测量能力的先进FSI诊断技术。结构的准周期非线性动力行为以及几何缺陷和温度对结构固有频率的影响。三维高速DIC系统也将为FSI数值模型的验证等问题提供重要工具。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。

This Major Research Instrumentation (MRI) award supports the acquisition of a three-dimensional (3D) high-speed digital image correlation (DIC) system that provides 3D full-field nonintrusive measurements of deformation, vibration and strain. The instrument will enable new research, education and outreach activities, and collaboration among universities, industry and national labs. Research on structural health monitoring of critical components and infrastructure can enable enhanced public safety in aircraft and buildings. A better understanding of nonlinear wave propagation can lead to new sensing capabilities for metamaterials -- paving the way for enhanced medical devices, more productive manufacturing systems and more sophisticated entertainment systems, and inspiring new technologies for data encryption and damage detection. The instrumentation will be incorporated into various undergraduate and graduate courses and students in the Meyerhoff Scholars Program and K-12 outreach activities will have an opportunity to use the instrument. The 3D high-speed DIC system will enable researchers to tackle challenging problems in dynamic systems, such as nonlinear wave propagation and metamaterials, structural health monitoring, fluid-structure interaction (FSI), nonlinear dynamics, and thermal modal parameter identification. Fundamental knowledge gaps to be addressed include experimental characterization of amplitude-dependent dispersion shifts in nonlinear lattices and wave motion stability, development of damage-sensitive vibration-based methods for sandwich panels and of advanced FSI diagnostic technologies with simultaneous flow and structural measurement capabilities, and the understanding of quasi-periodic nonlinear dynamic behaviors of structures and the effects of geometric imperfections and temperatures on natural frequencies of structures. The 3D high-speed DIC system will also provide an important tool for validation of numerical models of FSI and other problems.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.