RELIABLE NONDESTRUCTIVE EVALUATION OF DAMAGE IN INFRASTRUCTURE AND SOIL DYNAMIC CHARACTERIZATION USING NOVEL LASER TECHNOLOGY

使用新型激光技术对基础设施损坏和土壤动态特性进行可靠的非破坏性评估

• 批准号: RGPIN-2017-05059
• 负责人: Cascante, Giovanni
• 金额: $ 2.99万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=711401
• 关键词: RELIABLE; NONDESTRUCTIVE; EVALUATION; DAMAGE; INFRASTRUCTURE

If we are to maximize the service life of civil infrastructure (e.g. schools, bridges, power lines, pipelines), it is imperative to develop better and more cost effective methods to identify internal structural damage and characterize foundation soils. I have developed a novel system based on laser technology that makes it possible, for the first time, to actually see and quantify the ultrasonic wave field in the transducers and the materials they excite. This innovative technology has the potential to reveal fundamental understanding of how ultrasonic waves are generated, propagated, and attenuated so that internal damage can be reliably detected and foundation soils can be better characterized. The three main long-term goals of my research program are to 1) advance the fundamental understanding of ultrasonic wave generation, propagation, and attenuation using state-of-the art technology, laboratory and field testing, and numerical simulations; 2) use this new understanding to develop reliable nondestructive evaluation methods (NDE) to extend the service-life and safety of existing civil infrastructure; and 3) extend the application of these new NDE methods to the dynamic characterization of foundation soils to increase the safety of new infrastructure subjected to earthquake, wind, or machine vibrations. Consequently, the short-term goals of my research program are aimed at addressing the current lack of reliability of ultrasonic testing. We will start at the root of the problem: proper characterization of the ultrasonic sensors. For this task, we will use two new synergetic developments in our experimental program: the laser system and transparent particulate materials. By seeing for the first time the ultrasonic wave field inside the specimens, we will be able to measure the real input and output ultrasonic displacements. From the real displacements, we will gain fundamental understanding of the ultrasonic wave generation, propagation, and interaction of defects inside specimens. This research program will generate new and reliable methods that will make the Canadian industry more competitive. Our solutions will be based on robust analytical, experimental, and numerical programs. My research team has been doing pioneering work in NDE and soil dynamics for more than 15 years; as demonstrated by our publication record and the leadership roles that my graduate students have in the private and public sectors. This fact recognizes the need of nondestructive techniques for the extension of the service life of civil infrastructure - a multimillion-dollar task. The proposed research program provides fundamental knowledge that supports and complements a multi-faceted program that includes 5 PhD, 1 MSc, and 6 undergraduate students.

如果我们要最大限度地提高民用基础设施的使用寿命（例如学校，桥梁，电力线，管道），则必须开发更好，更具成本效益的方法来识别内部结构损害并表征基础土壤。我已经开发了一种基于激光技术的新型系统，该系统首次可以真正看到并量化传感器中的超声波场及其激发的材料。这项创新的技术有可能揭示对如何产生，传播和减弱超声波的基本了解，从而可以可靠地检测到内部损害，并可以更好地表征地基土壤。我的研究计划的三个主要长期目标是1）使用最先进的技术，实验室和现场测试以及数值模拟对超声波产生，传播和衰减的基本理解； 2）使用这种新的理解来开发可靠的非破坏性评估方法（NDE），以扩大现有民用基础设施的服务寿命和安全性； 3）将这些新的NDE方法的应用扩展到基础土壤的动态表征，以提高经受地震，风或机器振动的新基础设施的安全性。因此，我的研究计划的短期目标旨在解决目前缺乏超声测试的可靠性。我们将从问题的根源开始：超声传感器的正确表征。为此，我们将在实验程序中使用两个新的协同发展：激光系统和透明的颗粒材料。通过首次查看标本内部的超声波场，我们将能够测量实际输入和输出超声位移。从实际位移中，我们将获得对标本内部缺陷的超声波产生，传播和相互作用的基本理解。 该研究计划将生成新的可靠方法，这将使加拿大行业更具竞争力。我们的解决方案将基于强大的分析，实验和数值程序。我的研究团队从事NDE和土壤动态的开创性工作已有15年以上。正如我们的出版记录以及我的研究生在私人和公共部门中扮演的领导角色所证明的那样。这一事实认识到需要无损技术来延长民事基础设施的服务寿命 - 一项数百万美元的任务。拟议的研究计划提供了基本知识，该知识支持和补充了一个多方面的计划，其中包括5个博士学位，1个MSC和6名本科生。