张紧式锚泊系统松弛-张紧过程冲击张力分析

A taut mooring system may cause slack-taut alternative transformation with the motion of a floating body, which could result in the significant increase in dynamic tension amplitude in the mooring line. On the basis of the dynamic finite element analysis model, a series of sinusoidal excitation with different amplitudes and frequencies added to the upper end of the mooring line. Moreover, the change laws of dynamic tension in the slack-taut process are summarized and compared. The results indicated that the slack-taut phenomenon could occur in the mooring line when the amplitude and frequency of excitation reach a certain value. The minimum dynamic tension close to zero, and the maximum dynamic tension reach up to several times of pretension. The spectral analysis of dynamic tension shows that frequency doubling, and high-frequency components appear in addition to the frequency of excitation. The results could be used as reference for further investigation of the mechanism of snap loading, and the design of a mooring system.