A vision-based measurement and data acquisition system for structural testing and monitoring

卡尔加里大学结构组的研究旨在为土木工程基础设施的结构方面提供创新和具有成本效益的解决方案。这项研究包括对现代高性能和先进复合材料建造的结构行为的调查。结构健康监测技术也正在开发中。该小组的成员在结构部件的全面测试方面有着良好的记录，他们的实验研究近年来急剧增加。在结构测试过程中测量位移的传统方法包括使用位移传感器，这些位移传感器在测量位移的位置和方向上连接或放置在与测试样品接触的位置。结构组承担的许多项目都涉及动态、疲劳或爆炸载荷下的测试，这些测试可能会导致试件严重、突然或灾难性的破坏。在这些条件下，使用传统的测量装置和传感器而不牺牲它们是不可能的。因此，建议购买一套基于视觉的非接触式测量与数据采集系统。该系统包括：1)一组高速高分辨率数码相机；2)基于激光的位移传感器和控制器；3)高容量称重传感器；4)高性能模块化数据采集系统。相机系统将是有用的捕捉完整的变形行为和几何变化的试样在任何测试。该系统将允许在试样失效时提取正确的事件序列。激光传感器将用于在不接触样品的情况下精确测量不同位置的位移。高负荷应用需要高容量测压元件。需要新的数据采集系统来取代现有的旧系统。它将允许以比现有系统高得多的扫描速率从大量不同类型的传感器获取数据。

Research of the Structures Group at the University of Calgary aims at providing innovative and cost-effective solutions to the structural aspects of the civil engineering infrastructure. This research involves investigations into the behaviour of structures built of modern high performance and advanced composite materials. Structural health monitoring technologies are also being developed. Members of the group have a strong track record in full-scale testing of structural components, and their experimental research is increasing dramatically over the years. Traditional methods of measuring displacements during structural testing include the use of displacement transducers that are attached or placed in contact with the test specimen at the locations and in the direction of the displacements measured. Many of the projects undertaken by the Structures Group involve testing under dynamic, fatigue or blast loading, which may cause severe, sudden or catastrophic failure of the test specimens. Under these conditions, use of conventional measuring devices and transducers is not possible without sacrificing them. Therefore, it is proposed to purchase a vision-based and non-contact measuring and data acquisition system. The proposed system consists of: 1) A set of high-speed high-resolution digital cameras, 2) Laser-based displacement sensors and a controller, 3) High capacity load cells, and 4) A high performance modular data acquisition system. The camera system will be useful for capturing the complete deformation behaviour and geometric changes of the specimens throughout any test. The system will permit extraction of the correct sequence of events as the specimens fail. The laser sensors will be used for precise measurement of displacements at different locations without contact with the specimens. The high capacity load cells are needed for high load applications. The new data acquisition system is needed to replace the old existing system. It will allow data from a much larger number of different types of sensors to be acquired at a much higher scan rate than presently available with the existing system.