As one of the most critical vessel motion, heave motion will lead to the great tension at the top end of a steel catenary riser (SCR), and can also result in the compression buckling and large bending moment in the touchdown zone (TDZ). The purpose of this study is to investigate the motion transfer rule of top-end heave excitation along catenary risers and explore the underlying correlation between the riser dynamic amplification and heave motion characteristic. Extensive numerical calculations are well conducted by a developed mathematical model for riser dynamic based on the rod theory in the time domain. According to the results obtained from the proposed methodology, it can be found that the heave induced acceleration is the dominant factor on the dynamic top tension, and the dynamic tension and bending moment in the TDZ are mainly driven by the velocity of top-end heave excitation.

作为船舶最关键的运动之一，升沉运动会导致钢悬链线立管（SCR）顶端的巨大张力，也会导致触地区（TDZ）的压缩屈曲和大弯矩。本研究的目的是研究悬链线立管顶端升沉激励的运动传递规律，并探讨立管动态放大与升沉运动特性之间的潜在相关性。通过基于时域杆理论的立管动态数学模型，可以很好地进行广泛的数值计算。根据所提出的方法获得的结果，可以发现升沉诱导加速度是动态顶张力的主导因素，