Abstract
In this paper, we discussed the thinning pipe wall detection using coupled oscillation between cylindrical shell and attached sub-strcture. At first, the resonance frequencies of the in-plane bending deformation mode are compared between numerical and analytical model. Thereby, it is confirmed that the resonance frequency is changed at the pipe wall thinning by both models. The dependency of sensitivity of the resonance frequency to the mass of the attached sub-structure is evaluated.
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