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    Time-frequency Method Comparison for Wave-induced Fatigue Prediction of Deepwater SCRs
    HUANG Jun, KANG Zhuang, ZHANG Yansong, AI Shangmao
    Ocean Engineering Equipment and Technology    2023, 10 (2): 112-118.  
    Abstract129)      PDF(pc) (5975KB)(167)       Save
    Wave-induced fatigue damage is an important component of deep-water steel catenary riser (SCR) fatigue damage. In this paper, the fatigue damage caused by SCR wave in the South China Sea caused by storm state is predicted through time domain and frequency domain respectively. The difference of platform motion response and riser dynamic response obtained by time domain method and frequency domain method is also analyzed. The prediction results of fatigue damage risk position and damage extreme value are then compared. The applicability of the methods in prediction of deep-ocean risers’ wave-induced fatigue was evaluated. The result show that there is a huge gap between the time domain method and the frequency domain method, and that the damage risk position calculated by the frequency domain method is lagging behind. With the frequency domain method, the wave-induced fatigue cumulative damage is amplified, while the order of magnitude is consistent.
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    Research on the Mechanical Performance of Polyester Rope Based on the Dynamic Stiffness Model
    KANG Zhuang, SUI Haibo, HuangJun, AI Shangmao
    Ocean Engineering Equipment and Technology    2023, 10 (2): 140-144.  
    Abstract148)      PDF(pc) (6034KB)(262)       Save
    The taut mooring system using polyester rope as the mooring lines overcomes the heavy weight of the traditional chain mooring material and provides better mooring performance for the floating structures, which attracts much attention in the field of deep-water mooring. The nonlinear mechanical properties of the polyester make it more difficult to predict the tension response of the material. Therefore, it is essential to model this nonlinear relationship accurately. In this paper, based on the absolute nodal coordinate formulation under the condition of large axial tension and combined with the dynamic stiffness model of 8-strand braided polyester rope, the tension response of the polyester line is accurately calculated and analyzed, and the results are compared with the approximate method. The simulation shows that the axial tension of the polyester cable obtained by the accurate model is larger than that of the approximate method. The nonlinear constitutive relationship of the polyester cable displays the phenomenon that the larger stretch, the larger sitffness is. Besides, the approximate method will distort the tension prediction. Therefore, it is necessary to adopt an accurate dynamic stiffness model in calculating the tension response of mooring systems using polyester material. 
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    Experimental Study on the Influence of Mooring Line Breaking on the Hydrodynamic Performance of Semi-Submersible Platform
    LI Xu, XIAO Longfei, WEI Handi, LI Yan, ZHU Ziyang, WU Wencheng
    Ocean Engineering Equipment and Technology    2023, 10 (1): 48-56.  
    Abstract123)      PDF(pc) (19087KB)(133)       Save
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    Reliability Analysis of Small Unmanned Nuclear Power System Based on Dynamic Bayesian Network
    Mingjun Zhong, Yongjin Guo, Dan Zhang, Xiaowei Jiang
    Ocean Engineering Equipment and Technology    2023, 10 (1): 57-63.  
    Abstract121)      PDF(pc) (3715KB)(66)       Save
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