MRI: Acquisition of Digital Image Correlation System for Real-Time 3D Measurements and Closed-Loop Control

MRI：采集数字图像相关系统以进行实时 3D 测量和闭环控制

• 批准号: 1126540
• 负责人: Kaspar Willam
• 金额: $ 40万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1126540&HistoricalAwards=false
• 关键词: MRI; Acquisition; Digital; Image; Correlation

This Major Research Instrumentation (MRI) project involves acquisition of a Digital Image Correlation System. The photogrammetric technology provides full-field non-contact measurements of 3D displacements of complex test systems in real-time. The intent is two-fold, (a) to detect and visualize emerging cracks and strain concentrations on test articles without the use of traditional contact measurements such as strain gauges and differential transducers, and (b) to develop an adaptive feed-back signal for controlling the force input in the pre- and post-failure regime. The 3-D DIC measurement system by Trilion Inc. includes four pairs of 12 megapixel digital cameras, the Tritop coordinate measurement system, an image processing workstation and controller, and the Aramis processing software with a real-time interface for control. Each pair of digital cameras is mounted on a tripod with dedicated lighting to provide a series of stereoscopic images of the test article within the field of view. The Aramis processing software tracks the coordinates of 10,000+ facet points. It provides deformation field data for structural materials testing up to and beyond their maximum load resistance, and progressive failure such as crack initiation and propagation in structural components and systems.The portable instrumentation system will provide new opportunities for undergraduate and graduate students to acquaint themselves with the capabilities of digital image correlation systems and their application to a variety of research projects spanning from testing materials and infrastructural components to biomedical applications. Under the direction of eleven faculty, students in Civil and Mechanical Engineering will be trained in (a) the use of powerful imaging to track emerging failure mechanisms, and (b) the field of servo-controlled testing of materials and structures.

这个主要的研究工具（MRI）项目涉及获取数字图像相关系统。摄影测量技术可实时实时实时非接触式测量值。 意图是两倍，（a），以检测和可视化在测试物品上的新出现的裂纹和应变浓度，而无需使用传统的接触测量值，例如应变仪和差异传感器，以及（b）开发自适应馈回信号，以控制前和后开发后和开发后的力输入。 Trilion Inc.的3-D DIC测量系统包括四对12兆像素的数字相机，Tritop坐标测量系统，图像处理工作站和控制器以及具有实时接口的Aramis处理软件。 每对数码摄像机都安装在三脚架上，并带有专用照明，以在视野内提供一系列测试文章的立体图像。 Aramis处理软件跟踪10,000多个方面的坐标。它为结构材料测试提供了变形现场数据，直到其最大负荷阻力，以及诸如结构组件和系统中的裂纹启动和繁殖等进行性故障。便携式仪器系统将为本科生和研究生提供新的机会，以使自己熟悉数字图像相关系统的能力，并应用于跨越材料的各种研究项目的应用程序。 在11个教师的指导下，将在（a）使用强大的成像来跟踪新兴失败机制的情况下进行培训，以及（b）材料和结构的伺服控制测试领域。