A novel vibration based damage detection and structural health monitoring system

一种新型的基于振动的损伤检测和结构健康监测系统

• 批准号: 355120-2007
• 负责人: Taheri, Farid
• 金额: $ 3.84万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Idea to Innovation
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=365782
• 关键词: novel; vibration; based; damage; detection

The use of dynamic response to identify damage and its location in Structural Engineering has become an important research focus in the recent years. Most of the available vibration-based damage assessment methods rely on modal properties and are insensitive to structural damage, especially the locally or regionally concentrated types, and hence, are not regarded as suitable damage indicators.A robust damage detection system has been developed by the applicant, in which a robust signal processing technique (i.e., the empirical mode decomposition) and a novel energy based formulation are used to establish damage in structures. So far, the methodology manipulates the vibration signal of the structure obtained via piezoelectric sensors. The crux of the methodology is based on its novel "Damage index" formulation. The results of our study so far have shown the robustness and accuracy of the developed formulation and system for monitoring of defected pipes and adhesively bonded pipe joints.Motivation: Development of a technique that allows one to assess the integrity of local damage, such as a disbond in bonded joints or a loose/defected fastener in mechanically fastened joints, with inexpensive equipment along with a simple method is quite desirable. In such situations, the detection poses a serious challenge for the available procedures. For instance, it would be virtually impossible to apply the traditional vibration based damage detection methods to detect any disbond. Our methodology however can provide a very accurate assessment of such a situation. However, it requires further refinement to make it more robust and user-friendly, and its applicability to various real-life situations requires further investigation. For that the use of laser assisted vibration monitoring toll, instead of the piezoelectric sensors used to establish the integrity of our damage detection procedure, is proposed. It is strongly believed that the establishment of the applicability of the proposed laser assisted procedure and its applicability to a variety of real situations will make the system self-contained, marketable and very competitive in todays market.

利用动力响应识别损伤及其位置已成为近年来结构工程中的一个重要研究热点。现有的基于振动的损伤评估方法大多依赖于结构的模态特性，对结构损伤不敏感，特别是局部或区域集中的类型，因此不能被视为合适的损伤指示器。申请人开发了一个稳健的损伤检测系统，其中使用了稳健的信号处理技术(即经验模式分解)和基于能量的新公式来建立结构的损伤。到目前为止，该方法是通过压电式传感器获得结构的振动信号。该方法的关键是基于其新颖的“损害指数”公式。到目前为止，我们的研究结果表明，所开发的用于监测缺陷管道和粘接管道接头的配方和系统的健壮性和准确性。动机：开发一种技术，允许人们利用廉价的设备和简单的方法来评估局部损伤的完整性，例如粘接接头中的脱粘或机械紧固接头中的松动/缺陷紧固件。在这种情况下，检测对现有程序构成严重挑战。例如，应用传统的基于振动的损伤检测方法来检测任何脱粘几乎是不可能的。然而，我们的方法可以非常准确地评估这种情况。然而，它还需要进一步改进，使其更加健壮和用户友好，它对各种现实情况的适用性还需要进一步研究。为此，提出使用激光辅助振动监测收费，而不是使用压电式传感器来建立我们的损伤检测程序的完整性。我们坚信，所提出的激光辅助手术的适用性及其在各种实际情况下的适用性的建立，将使该系统具有自给自足、适销对路的特点，在当今市场上极具竞争力。