弾性棒と連成した円筒殻の面内曲げ変形モードの実験モード解析

抄録

To prevent aging in buried water pipes that have exceeded their service life, it is crucial to assess pipe conditions using non-destructive testing and apply the findings to pipe renewal and repair strategies. This study investigates the coupled vibration of a water pipe with an attached bar-like structure. The pipe and bar are modeled as a circular ring element and an elastic bar element, respectively, connected via spring elements. The experimental modal analysis (EMA) was performed to reveal the coupled vibration phenomena between the in-plane bending mode in water main and the longitudinal mode in elastic bar. As the results, the existence of the coupled mode between the in-plane bending mode and the bar deformation mode around the 1 kHz. In addition, the isolated longitudinal mode of bar structure was obtained the high frequency band over 3 kHz.