Abstract
The dynamic response of the telescopic gangway strongly links to the relative motion which is significant when the gangway vessel works along with another floating unit in proximity. The failure might cause operational downtime or even personnel casualty. In this paper, gangway motions, including extension, retraction, rotations, and relative motions, are studied numerically in the time domain and compared to experimental measurements. The hydrodynamic interaction of the multi-body system is analyzed by 3D diffraction and radiation computation in the frequency domain. The nonlinear roll damping is calibrated and validated in both free decay and regular waves. Two uni-directional scenarios of primary irregular waves and one bi-directional scenario of both primary and secondary irregular waves are taken into account in the study. Remarkable vertical motion up to 10 m between gangway departure and landing points are observed even if the significant wave height is only 3.25 m. Extreme value analysis shows the gangway inclination can be as high as 17° which exceeds the maximum acceptance so that enhanced slip resistance feature must be added on the gangway. The different patterns of gangway motion trajectory in the vertical plane are also illustrated to corroborate the conclusion.
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