Ultrasonic assessment of Young's modulus in cast iron pipes

铸铁管杨氏模量的超声评估

• 批准号: 522467-2018
• 负责人: Cascante, Giovanni
• 金额: $ 1.78万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=646946
• 关键词: Ultrasonic; assessment; Young; modulus; cast

Cast iron pipes have been used for almost two centuries in water and gas distribution systems. Their deterioration results in loss of**strength; which compromises the reliability of the network. The current technology for wall thickness evaluation relies on the use of**an accurate value of the Youngs modulus of the pipeline section. We have developed a novel laser-based system 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 can show how ultrasonic waves are generated, propagated, and attenuated in pipelines; so that the**elastic modulus can be reliably evaluated. The main goal of this research program is aimed at addressing the current lack of**reliability of acoustic and ultrasonic testing for the evaluation of the pipe wall thickness. We will start at the root of the problem:**proper characterization of the acoustic and ultrasonic sensors. Currently, wave velocity (elastic modulus) is computed using**practically only one data point out of thousands that are recorded in typical ultrasonic tests. Because the response of ultrasonic**sensors is not the constant for the same input excitation at different frequencies. However, the real responses are fundamental to**develop reliable ultrasonic methods. We will evaluate the real response of pipelines using laser technologies to develop new**techniques that will make the Canadian industry more competitive. Our solution will be based on a robust analytical, experimental,**and numerical programm.

近两个世纪以来，铸铁管一直被用于供水和燃气分配系统。它们的劣化会导致**强度的损失；这会损害网络的可靠性。目前的壁厚评估技术依赖于使用**管道段的杨氏模量值的精确值。我们开发了一种新的基于激光的系统，它使**第一次有可能真正看到和量化换能器及其激发的材料中的超声波波场。**这项创新技术可以显示超声波是如何在管道中产生、传播和衰减的；因此，**弹性模数可以得到可靠的评估。这项研究计划的主要目标是解决目前在评估管壁厚度方面缺乏**可靠性的声学和超声波检测。我们将从问题的根源开始：**正确描述声学和超声波传感器。目前，波速(弹性模数)的计算使用**在典型的超声波测试中记录的几千个数据点中的一个。因为对于不同频率的相同输入激励，超声波传感器的响应不是常量。然而，真正的响应是**开发可靠的超声波方法的基础。我们将评估管道使用激光技术的真实反应，以开发新的**技术，使加拿大的行业更具竞争力。我们的解决方案将基于强大的分析、实验、**和数值程序。