Abstract
This study presents numerical simulations and experimental verification of a vibration-based damage detection technique. Health monitoring of a submerged pipe's girth-weld against an advancing notch is attempted. Piezoelectric transducers are bonded on the pipe for sensing or actuation purposes. Vibration of the pipe is excited by two means: (i) an impulsive force; (ii) using one of the piezoelectric transducers as an actuator to propagate chirp waves into the pipe. The methodology adopts the empirical mode decomposition (EMD), which processes vibration data to establish energy-based damage indices. The results obtained from both the numerical and experimental studies confirm the integrity of the approach in identifying the existence, and progression of the advancing notch. The study also discusses and compares the performance of the two vibration excitation means in damage detection.
Highlights
Offshore pipelines are susceptible to initiation of various types of defects, including corrosion, dents, and cracking/leakage, especially in their mating interfaces.periodic visual inspections have to be carried out by skilled divers or remote operatingSensors 2014, 14 vehicles (ROVs) [1]
The results of the damage detection trials conducted by the two excitation technique are presented and the outcomes are discusses
The results of the damage detection tried by the chirp method qualitatively confirm the findings of our previous trial, as noted above
Summary
Offshore pipelines are susceptible to initiation of various types of defects, including corrosion, dents, and cracking/leakage, especially in their mating interfaces (e.g., girth-welds, and bolted joints). The method could identify the location of damage by producing relatively large damage indices as the sensing probes passed across the defect regions They marked the inclination angle along with the relative location of their adopted transducers-damage, and the proximity of the sensors as the influential parameters in the damage detection of the submerged plate. Numerical simulations and experimental verification of a vibration-based damage detection methodology (developed in our research group [13]) for health monitoring of a submerged pipe’s girth-weld against a propagating notch are presented. The paper begins with providing a brief introduction on the vibration-based damage detection strategy adopted in this work This is followed by the details of the developed numerical model and the experimental setup used in the study. This method, which was developed in our research group, has been adopted in the current study
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