A study of the effect of waterborne pressure on ultrasonic guided wave signals in pipelines
In order to study the effect of water-loaded pressure on the ultrasonic guided wave signals,the dispersion curve and wave structure of guided wave in the pipe are analyzed by using the semi-analytical finite element(SAFE)method.The L(0,2)mode guided wave is selected in the detection experiment.A waterproof clamp that can withstand a pressure of 30 MPa is designed to encapsulate the piezoelectric transducer on the pipe.The encapsulated pipe is placed into a pressure chamber for the pressure cycle test,where the pressure varies between 0 MPa and 30 MPa.The guided wave signals of the heathy pipe and the damaged pipe with 5％area loss are collected during the pressure cycle experiments in order to analyze the effect of the water-loaded pressure on the guided wave signals.The experimental results show that the waterproof clamp has good waterproof and pressure-resistant properties,and at the same time,the water-loaded pressure does not have a significant effect on the amplitude of the L(0,2)modal waveguide signal.
pipeultrasonic guided wavewater load pressuresemi-analytical finite element
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