浸没式浮筒对系泊缆松弛-张紧特性的影响研究

为了研究浸没式浮筒对悬链线系泊缆松弛-张紧特性的影响,本文基于集中质量法建立了下端锚固、上端做简谐运动的带浮筒悬链线系缆运动微分方程。运用Newton-Raphson法和Howbolt差分法,求解了系缆的运动特性和动张力值。通过与无浮筒悬链线系泊系统的对比,分析了几种不同参数的浮筒对系泊缆松弛-张紧现象及冲击放大系数两个方面的影响。结果表明:附加一定大小的浸没式浮筒能有效抑制系泊缆松弛-张紧现象的出现,并且减小系缆运动过程中动张力的冲击放大系数;但当附加浮筒的净浮力过大时,在极端海况下,会助长系泊缆上端出现松弛-张紧现象,进而影响系泊物的稳定性。

Study on the effect of submersed buoy on the taut-slack characteristics of the mooring line

Effect of submersed buoy on the taut-slack characteristics of catenary mooring line is investigated.The lower end of the mooring line is anchored,and the upper end moves in a simple harmonic motion.The differential equations of motion for the system are derived by using the lumped-mass method.The Newton-Raphson method and Howbolt’s difference method are used to solve the motion characteristics and dynamic tension of the mooring line.By comparing with the buoy-free catenary mooring system,effects of several buoys with different parameters on the phenomenon of taut-slack and the impact amplification factor of the mooring lines are analyzed.Results obtained show that the additional submersed buoy can effectively suppress the occurrence of taut-slack phenomenon of the mooring line,and reduce the impact amplification factor during the mooring process of the cable.However,when the net buoyancy of the additional buoy is too large under extreme sea conditions,the taut-slack phenomenon of the mooring line near the upper end is enhanced,thereby affecting the stability of the platform operation.