Verification and Improvement of a Novel Vibration-based Damage Identification Approach

石油和天然气以及化学和核工业中使用的管道通过机械（螺栓），焊接或粘合接头连接在一起。这种系统中存在的节理的完整性是非常关键的，因为它们的破坏可能导致毁灭性的经济和环境后果。因此，对此类节点进行结构健康监测至关重要。SHM的最新进展之一是基于振动的方法的发展。近年来，人们在利用各种基于振动的方法开发能够可靠地检测结构损伤的技术方面付出了巨大的努力。尽管如此，该领域的研究表明，大多数基于振动的技术主要适用于检测整体损伤（主要影响系统整体动力学的损伤），而不能检测局部损伤（如接头裂缝或螺栓松动）。

Pipelines used in oil and gas, as well as in chemical and nuclear industries are joined together by mechanical (bolted), welded or adhesively bonded joints. The integrity of the joints present in such systems is very critical, since their failure could result in devastating economical and environmental ramifications. Therefore, structural health monitoring (SHM) of such joints is of critical and paramount importance. One of the recent advances in SHM has been the development of vibration-based methods. Significant efforts have been expended in recent years in developing techniques that can reliably detect damage in structures using various vibration-based methods. Nonetheless, research in this area has demonstrated that most vibration-based techniques are mainly suitable for detecting global damage (those primarily affecting the global dynamics of the system), and cannot detect local damage (such as cracks in joints or bolt loosening.)