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Full-Text Articles in Engineering
Mechanism And Model Testing Of Pipelay Vessel Roll Affected By Large Period Swells, Jia Li, Zhen-Ming Lei, Li-Qiang Sun, Shu-Wang Yan
Mechanism And Model Testing Of Pipelay Vessel Roll Affected By Large Period Swells, Jia Li, Zhen-Ming Lei, Li-Qiang Sun, Shu-Wang Yan
Journal of Marine Science and Technology
Pipelay vessels, such as the Hai Yang Shi You 201, have been seriously affected by large period swells in the East China Sea, where the roll amplitude is extremely large for normal pipe lay. Two conditions that can generate dramatic rolls, namely, parametric and synchronous rolling, were analyzed theoretically in this study. Model tests were also performed on the pipelay vessel Hai Yang Shi You 201 with course angles of 0, 30, 60, and 90°in swells of varying periods and wave heights to examine the aforementioned effect. The test data proved that drastic roll is not caused by parametric rolling, …
Model Tests Of Dragging Hall Anchors In Sand, Yu-Xiao Ren, Zhen-Ming Lei, Li-Qiang Sun, Shu-Wang Yan
Model Tests Of Dragging Hall Anchors In Sand, Yu-Xiao Ren, Zhen-Ming Lei, Li-Qiang Sun, Shu-Wang Yan
Journal of Marine Science and Technology
Hall anchors are often used as the main anchors in great medium ships. However, the methods for determining the holding capacity of Hall anchors when being pulled in soil are rarely proposed. In this study, a series of model tests was carried out using four scaled Hall anchor models to determine the kinematic behavior, trajectory, and development rules of the holding capacity of the anchors relative to dragging distances. Moreover, the holding force coefficients of the Hall anchors in sand were identified after the tests