基于OrcaFlex的钢悬链立管疲劳损伤预报

涡激振动是钢悬链立管疲劳损伤的重要诱导因素之一，因此涡激振动分析在钢悬链立管设计中占据重要地位。OrcaFlex在海洋工程领域功能强大、应用广泛，能够提供两种涡激振动疲劳损伤预报方法，分别是基于模态叠加法的频域预报方法和基于Iwan-Blevins尾流振子模型的时域预报方法。OrcaFlex的涡激振动时域预报模型只考虑了横流向涡激振动造成的疲劳损伤，基于OrcaFlex的时域预报方法开发了双自由度涡激振动尾流振子模型的接口，考虑了浮式平台运动对钢悬链立管的涡激振动激励作用，实现了钢悬链立管双自由度涡激振动疲劳损伤预报。

Fatigue damage prediction of steel catenary riser based on OrcaFlex

Vortex-induced vibration is one of the significant inducing factors of fatigue damage in steel catenary risers (SCRs), thus vortex-induced vibration analysis holds crucial importance in the design of SCRs. OrcaFlex, with its robust functionality and widespread application in marine engineering, offers two fatigue damage prediction methods for vortex-induced vibration, namely the frequency domain prediction method based on modal superposition and the time domain prediction method based on the Iwan-Blevins wake oscillator model. The time domain prediction model of OrcaFlex for vortex-induced vibration only considers fatigue damage caused by transverse vortex-induced vibration. An interface for the development of a two-degree-of-freedom wake oscillator model for vortex-induced vibration is established based on OrcaFlex''s time domain prediction method, considering the influence of floating platform motion on the excitation of SCRs due to vortex-induced vibration. This facilitates the prediction of fatigue damage in SCRs due to two-degree-of-freedom vortex-induced vibration.