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http://dx.doi.org/10.7842/kigas.2017.21.1.18

Pipe Wall-Thinning Inspection using Vibration Modes of Pipes with Circumferentially Varying Thickness  

Han, Soon-Woo (Dept. of Nuclear Convergence Technology, Korea Atomic Energy Research Institute)
Seo, Jeong-Seok (Dept. of Nuclear Convergence Technology, Korea Atomic Energy Research Institute)
Park, Jin-Ho (Dept. of Nuclear Convergence Technology, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Institute of Gas / v.21, no.1, 2017 , pp. 18-26 More about this Journal
Abstract
This work proposes an alternative pipe wall-thinning inspection method based on change of eigenfrequencies of shell vibration modes in wall-thinned pipes. It takes much time to detect wall-thinning of pipes using ultrasonic thickness gauge and only a limited number of pipes are under regular inspection. In a pipe with locally decreased thickness, stiffness varies along circumferential direction and natural frequencies of shell vibration modes of the pipe change or frequencies of same modes bifurcate into two different values. Therefore, one can monitor pipe wall-thinning by measuring change of natural frequencies or estimate wall-thinning shape qualitatively. The feasibility of the proposed method was studied by FE vibration analysis for wall-thinned pipes. Modal testing was also carried out for the pipes with artificial wall-thinned section to verify the working performance of the suggested technique.
Keywords
pipe wall-thinning inspection; natural frequencies; shell vibration modes;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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