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

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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.)