Wave propagation and transduction of guided waves for non-destructive evaluation, structural health monitoring and biomedical applications

用于无损评估、结构健康监测和生物医学应用的波传播和导波传导

• 批准号: RGPIN-2014-04956
• 负责人: Belanger, Pierre
• 金额: $ 1.82万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638747
• 关键词: Wave; propagation; transduction; guided; waves

This research program will deliver highly innovative techniques using guided waves in (1) non-destructive testing, (2) structural health monitoring and (3) biomedical engineering. These innovations will be achieved through fundamental research on guided wave propagation and the development of novel transduction methods. Guided waves are a type of mechanical stress wave that propagate in elongated structures when the wavelength is comparable to one of the dimensions of the structure. As a result of a decade-long research effort from the scientific community, guided waves are now routinely used to screen large areas of pipes and other elongated structures for cracks, corrosion and other types of defects. Through fundamental research on the propagation of guided waves and innovations in instrumentation, a pioneering technique for thickness mapping of large, partially accessible plate-like structures will be delivered. The petrochemical industry has a keen interest in such a technique for the inspection of their pressure vessels and pipelines.In structural health monitoring, transducers are permanently installed on a structure in order to periodically examine it for damage and provide information about any damage that is detected. Guided waves have emerged as a prominent option as they can offer good estimates for the location, severity and types of damage. Low frequency shear horizontal waves are particularly interesting for this application because they are non-dispersive. However, the omnidirectional transduction required in structural health monitoring remains a challenge that this research program will overcome.The third area of application is medical use of guided waves. Although ultrasound is a well-established tool in medical imaging, the use of guided waves in biomedical engineering is still in its infancy. An aspect of this research program is to study the propagation of guided waves outside the non-destructive testing field. The propagation of guided waves in bones has already been studied but more research is required in order to use it as a tool for the detection of osteoporosis. However, the propagation of guided waves in the spinal cord is still unexplored and could lead to exciting applications to help orthopaedic surgeons and neurosurgeons evaluate spinal cord injuries.

该研究项目将提供高度创新的技术，利用导波进行(1)无损检测，(2)结构健康监测和(3)生物医学工程。这些创新将通过对导波传播的基础研究和新型转导方法的发展来实现。导波是一种机械应力波，当波长与结构的一个尺寸相当时，在细长结构中传播。作为科学界长达十年的研究成果，导波现在通常用于筛选大面积管道和其他细长结构的裂缝，腐蚀和其他类型的缺陷。通过对导波传播的基础研究和仪器的创新，将提供一种用于大型，部分可接近的板状结构的厚度映射的开创性技术。石油化工行业对这种检测压力容器和管道的技术有着浓厚的兴趣。在结构健康监测中，传感器永久安装在结构上，以便定期检查结构是否损坏，并提供有关检测到的任何损坏的信息。导波已经成为一个突出的选择，因为它们可以很好地估计损伤的位置、严重程度和类型。低频剪切水平波在这种应用中特别有趣，因为它们是非色散的。然而，结构健康监测所需的全向转导仍然是本研究计划将要克服的挑战。第三个应用领域是导波的医疗用途。虽然超声在医学成像中是一种成熟的工具，但导波在生物医学工程中的应用仍处于起步阶段。本研究计划的一个方面是研究导波在无损检测场外的传播。导波在骨骼中的传播已经被研究过，但为了将其作为检测骨质疏松症的工具，还需要更多的研究。然而，引导波在脊髓中的传播仍未被探索，并可能导致令人兴奋的应用，以帮助骨科医生和神经外科医生评估脊髓损伤。