A reliability evaluation method based on the weakest failure modes for side-by-side offloading mooring system of FPSO |
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| Institution: | 1. Harbin Engineering University, China;2. Marine Hydrodynamics Laboratory, University of Michigan, United States;3. Jiangsu Maritime Institute, China;1. Instituto Superior Técnico, Universidade de Lisboa, Centre for Marine Technology and Engineering, Portugal;2. University of Oxford;3. Shell International Exploration and Production;1. Institute of Applied Mathematics, Putian University, Putian 351100, Fujian, China;2. The Institute of Math. Sci., The Chinese University of Hong Kong, Shatin, N.T., Hong Kong;1. Laboratory of Computer Science, École Polytechnique, Paris, France;2. DAVID, Université de Versailles St-Quentin-en-Yvelines, Versailles, France;3. Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Trondheim, Norway;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China;3. School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;4. College of Harbour Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Offshore structures are complex systems, and numerous failure modes must be taken into consideration when reliability analysis in different loads and environment conditions are conducted on them. It is difficult to obtain structural system reliability with respect to complicated systems with numerous failure modes and dependency consideration among them. This paper applies the combination of the weakest failure modes theory with structural reliability theory to conduct reliability analysis on of side-by-side offloading mooring system of FPSO. Firstly, the numerical simulation of the system in different conditions is addressed to acquire the statistical data of time-history stress of components including hawsers, fenders and yoke, based on which, the reliability indexes of all the failure modes and correlation coefficient matrix are derived. Then the weakest failure modes, i.e. the representative failure modes that have significant impact on the system, are located through Probability Network Evaluation Technique. The probability of structural system is estimated through the weakest failure modes by considering the system as series. The analysis results indicate that two environment conditions (0°&0°&0° and 0°&30°&45° in combinations of wave, wind and current) are relative dangerous, which is in good correspondence with the practical expertise. The method is verified to be an effective and convenient evaluation approach for structural reliability analysis in terms of complex systems. It is beneficial for the identification of structure indicators from the weakest failure mode group and conduct optimum of structural system configurations in the design stage. |
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| Keywords: | Structural system reliability analysis The weakest failure modes Probability network evaluation technique Side-by-side offloading system Dynamic response |
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