Abstract
Thickness measurement plays an important role in the monitoring of pipeline corrosion damage.However,the require-ment for prior knowledge of the shear wave velocity in the pipeline material for popular ultrasonic thickness measurement limits its widespread application.This paper proposes a method that utilizes cylindrical shear horizontal(SH)guided waves to estimate pipeline thickness without prior knowledge of shear wave velocity.The inversion formulas are derived from the dispersion of higher-order modes with the high-frequency approximation.The waveform of the example problems is simulated using the real-axis integral method.The data points on the dispersion curves are processed in the frequency domain using the wave-number method.These extracted data are then substituted into the derived formulas.The results verify that employing higher-order SH guided waves for the evaluation of thickness and shear wave velocity yields less than 1％error.This method can be applied to both metallic and non-metallic pipelines,thus opening new possibilities for health monitoring of pipeline structures.
基金项目
Natural Science Foundation of Jilin Province of China(20240402081GH)
Natural Science Foundation of Jilin Province of China(20220101012JC)
National Natural Science Foundation of China(42074139)
State Key Laboratory of Acoustics,Chinese Academy of Sciences(SKLA202308)
NETL
NSTL
万方数据