A novel vibration based damage detection and structural health monitoring system

利用结构动力响应识别结构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。现有的大多数基于振动的损伤评估方法依赖于模态特性并且对结构损伤不敏感，特别是局部或区域集中类型，因此，不被认为是合适的损伤指示器。经验模态分解）和一种新的基于能量的公式被用来建立结构中的损伤。到目前为止，该方法通过压电传感器获得的结构的振动信号进行处理。该方法的关键是基于其新颖的“损害指数”公式。到目前为止，我们的研究结果已经显示出的鲁棒性和准确性的开发配方和系统的监测缺陷的管道和粘接的管道joints.Motivation：开发一种技术，允许一个评估的完整性，如剥离的粘接接头或松散/缺陷的紧固件在机械紧固接头，与廉价的设备沿着与一个简单的方法是非常可取的。在这种情况下，检测对现有程序构成严重挑战。例如，这将是几乎不可能的应用传统的基于振动的损伤检测方法来检测任何剥离。然而，我们的方法可以对这种情况进行非常准确的评估。然而，它需要进一步完善，使其更加强大和用户友好，其适用于各种现实生活中的情况需要进一步调查。为此，建议使用激光辅助振动监测仪，而不是用于建立损伤检测程序完整性的压电传感器。我们坚信，所提出的激光辅助手术的适用性的建立及其对各种真实的情况的适用性将使该系统在当今市场上独立、适销且极具竞争力。

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.