绷紧式系泊缆冲击张力特性研究

采用集中质量法研究了绷紧式系泊系统中系缆由于松弛-张紧过程产生的冲击张力。建立系泊缆绳离散的集中质量模型,对其独立单元进行受力分析并建立了单元的运动方程。给定缆绳上端点简谐激励,通过Ansys中的Aqwa模块,分析了缆绳的运动响应;针对缆绳运动响应过程中的三种状态进行了模拟计算,探讨了冲击张力产生的条件;研究了缆绳初始预张力、上端点激励幅值和频率、拖曳力系数、弹性模量以及单位长度质量对动态张力的影响。研究结果表明:这些影响因素不仅会影响缆绳动态张力的大小,也会对缆绳中的冲击张力产生一定的影响。

Investigation on the impact tension characteristics of taut mooring lines

The impact force caused by the relaxation tension of the mooring line in the taut mooring system is studied by used of the method of lumped mass. Mooring lines discrete lumped mass model is established, the stress is analyzed and the equation of motion for the independent unit is established. Given cable endpoint harmonic excitation, through ANSYS/Aqwa, the response of cable movement is analyzed; the cable motion response process in three states is simulated and the impact tension conditions are discussed; and the initial cable tension, upper point excitation amplitude and frequency, drag effect of drag coefficient, elastic modulus and mass per unit length of dynamic tension are studied. The results show that these factors will not only affect the dynamic cable tension, but also have some influence on the impact load of cable.