Damage Identification for Connection of Pipeline Structures Using PZT-based Wave Method

摘要

For a pipeline structure, the local failure due to connection damages might lead to the local force unbalance of the connection surface or body, resulting in the severe failure of the whole pipeline structure. However, there is the lack of effective method for monitoring the connection damage because of the complicated connecting forms and damage types such as defects, fatigue, crack, and buckling etc. In the paper, based on the experiment research, an equivalent relationship between the signal energy transmission and the connection damage such as bolt loosening is proposed by dealing the pipeline connection with a black box, to make a quantitative monitoring and evaluation of the connection damages. Meanwhile, piezoelectric ceramic patches used as transducers will be applied to generate detection signals, to set up the connection monitoring model based on the signal energy method and conduct relevant experiment for validation. The relationship between the test signal energy and the bolt torque which represents the degree of bolt loosening can be used for damage identification of pipeline structure connection. The proposed method in the paper will realize the efficient and real time intelligent monitoring and damage evaluation for pipeline structure connection.