Simulation Study on Axial Location Identification of Damage in Layered Pipeline Structures Based on Damage Index

This study investigates the feasibility of identifying axial position circumferential defects in laminated pipeline structures based on damage indices. Wavelet packet decomposition is combined with indices, and effects dual same but different positions, as well indices are separately studied. Our aim was to determine potential use identify structures. ABAQUS finite element analysis software used establish models single (with positions). The structure composed a steel pipe (structural layer), rigid polyurethane foam (insulation high-density polyethylene (anticorrosion layer). received sensing signals were averaged, subjected 5-level wavelet decomposition, calculate index values, which then organized into matrix. Based trend changes matrix, variations number identification analyzed. results indicate that influenced by defects, increase distance between second piezoelectric sensor. found when 1.7λ≤PD≤3.4λ, Idouble defect 90°<Isingle defect<Idouble 0°; 3.7λ≤PD≤4λ, 90°<0.3<Idouble 0°<Isingle defect. article demonstrates can be achieved using values Additionally, this method overcomes limitation packet’s inability relatively small relative distances. provides new ideas methods for