MRI: Acquisition of a Volumetric, 3-Component Particle Displacement and Velocity Measurement System for Mechanical and Environmental Engineering Measurements

MRI：获取用于机械和环境工程测量的体积三分量粒子位移和速度测量系统

• 批准号: 0821420
• 负责人: Paul Krueger
• 金额: $ 19.65万
• 依托单位: Southern Methodist University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0821420&HistoricalAwards=false
• 关键词: MRI; Acquisition; Volumetric; Component; Particle

CBET-0821420KruegerAdvances in technology and engineering require innovative approaches that often involve systems more complex than their predecessors. Increased complexity necessitates more sophisticated measurement techniques in order to understand, quantify, and refine innovative approaches. This is abundantly apparent in fluid flows and mechanical deformations, which are typically 3-dimensional (3D) and may involve highly unsteady or transient behavior. Recent advances in particle imaging and tracking now, for the first time, allow measurement of time-varying 3D particle displacement and velocity within a volumetric region. The objective of this MRI project is purchase of a TSI V3V system capable of 3D (volumetric), 3-component displacement and velocity measurements for use in a range of projects including porous media flows, sea turtle locomotion, investigation of diesel particle collection efficiency in electrostatic precipitators (ESP), optimization of plant-based contaminant remediation, and measurement of plastic deformation fields in 3D sheet metal for assessing mechanical properties and spot weld failure mechanisms. The TSI V3V system has refined and commercialized the technology used in defocusing digital particle image velocimetry (DDPIV). Specifically, the system extracts the 3D location of imaged particles in a flow or dots on a surface based on their location in the image plane and a quantified measure of how "out-of-focus" they are. Then comparing particle positions obtained from successive images using particle tracking techniques, particle displacements and, when divided by inter-frame delay, velocities may be obtained. Particle positions anywhere within a designed volumetric field of view (FOV) may be triangulated, so the results are truly volumetric and 3D. Currently available fast data transfer systems allow for capture of image sequences so that time-varying data may be obtained as well. Finally, the self-contained, single imaging plane configuration makes measurements relatively easy, even in settings where much/most of the experiment is optically inaccessible. As such, the V3V system is ideal for providing essential 3D velocity and displacement information in a wide range of existing and future projects. Intellectual Merit. Purchase of the V3V system will provide an unprecedented capability in volumetric, 3-component measurement of complex flow and mechanical deformation phenomena. This capability will provide essential information for understanding the ecology of an endangered species (sea turtles), refining and optimizing methods for maintaining air and water quality, and understanding the properties and failure mechanisms of alloys used in automobile manufacturing. Application of the V3V system to these areas will also involve efforts to improve the system capability including increasing the accuracy of displacement measurements by borrowing from image correlation analysis tools developed for 2D mechanical deformation measurements and adjusting the FOV of the system for increased resolution using a specialized optical setup. Both approaches promise to improve the results of the current projects and promote application of the purchased V3V system to a wider range of research areas. Broader Impacts. The V3V system will be utilized by two departments (Mechanical Engineering and Environmental and Civil Engineering) on research spanning several disciplines (engineering, biology, and chemistry). The broad utilization of the V3V system will bring together PIs, graduate students, and undergraduates from these diverse disciplines. Moreover, the combination of a state-of-the-art measurement system with novel and highly relevant research topics such as endangered species, air quality, and plant-based contaminant remediation promises to attract new students and underrepresented groups to research. Outreach will be further enhanced by showcasing the research projects and results in public settings such as "Science Day at the Zoo," an event organized by the Dallas Zoo and Aquarium to promote science education in the local community and continuing education for K-8 teachers in the Dallas-Ft. Worth Metroplex.

技术和工程的进步需要创新的方法，这些方法通常涉及比以前更复杂的系统。复杂性的增加需要更复杂的测量技术来理解、量化和改进创新方法。这在流体流动和机械变形中非常明显，流体流动和机械变形通常是三维（3D）的，并且可能涉及高度不稳定或瞬态行为。粒子成像和跟踪的最新进展现在首次允许测量体积区域内的时变3D粒子位移和速度。本MRI项目的目标是购买能够进行3D成像的TSI V3 V系统。（体积），3分量位移和速度测量，用于一系列项目，包括多孔介质流动，海龟运动，静电除尘器（ESP）中柴油颗粒收集效率的研究，基于植物的污染物修复的优化，以及测量3D金属板中的塑性变形场以评估机械性能和点焊失效机制。TSI V3 V系统完善了散焦数字粒子图像测速（DDPIV）技术，并将其商业化。具体地，系统基于它们在图像平面中的位置和它们如何“离焦”的量化测量来提取流中的成像颗粒或表面上的点的3D位置。然后比较使用粒子跟踪技术从连续图像获得的粒子位置，可以获得粒子位移，并且当除以帧间延迟时，可以获得速度。在设计的体积视场（FOV）内的任何位置的粒子位置都可以进行三角测量，因此结果是真正的体积和3D。当前可用的快速数据传输系统允许捕获图像序列，使得也可以获得时变数据。最后，独立的单成像平面配置使得测量相对容易，即使在大部分/大部分实验都是光学不可访问的设置中。因此，V3 V系统非常适合在各种现有和未来项目中提供基本的3D速度和位移信息。智力优势。购买V3 V系统将为复杂流动和机械变形现象的体积、三分量测量提供前所未有的能力。这种能力将为了解濒危物种（海龟）的生态、改进和优化保持空气和水质量的方法以及了解汽车制造中使用的合金的性能和失效机制提供重要信息。V3 V系统在这些领域的应用还将涉及提高系统能力的努力，包括通过借用为2D机械变形测量开发的图像相关分析工具来提高位移测量的准确性，以及使用专门的光学设置来调整系统的FOV以提高分辨率。这两种方法都有望改善当前项目的结果，并促进所购买的V3 V系统在更广泛的研究领域的应用。更广泛的影响。V3 V系统将由两个部门（机械工程和环境与土木工程）用于跨多个学科（工程，生物和化学）的研究。V3 V系统的广泛使用将汇集来自这些不同学科的PI，研究生和本科生。此外，最先进的测量系统与新颖且高度相关的研究课题（如濒危物种，空气质量和基于植物的污染物修复）相结合，有望吸引新生和代表性不足的群体进行研究。通过在公共场所展示研究项目和成果，如“动物园科学日”，将进一步加强外联，该活动由达拉斯动物园和水族馆组织，以促进当地社区的科学教育和达拉斯英尺K-8教师的继续教育。沃思大都会区