CAJ | 학술논문

研究基于可靠度的方法，对深海复合材料悬链线立管进行优化设计分析。对于正交各向异性层合复合材料结构而言，叠层顺序不同、各层铺角变化以及层间厚度差异等都会影响到结构的承载能力，因此，有必要引进可靠度作为优化设计指标。首先，根据经典层合板理论计算整体模型的等效属性，建立悬链线立管整体分析模型，得到关键截面响应，以此作为局部分析模型的约束；然后，运用试验设计方法构建Kriging近似模型；最后，利用蒙特卡罗撒点方法对比分析确定性优化与可靠性优化的结果。研究表明：优化后的深海复合材料立管在满足应力强度设计的要求下可有效降低结构重量，所提出的基于可靠度的优化设计复合材料悬链线立管具有可行性。
연구기우가고도적방법，대심해복합재료현련선립관진행우화설계분석。대우정교각향이성층합복합재료결구이언，첩층순서불동、각층포각변화이급층간후도차이등도회영향도결구적승재능력，인차，유필요인진가고도작위우화설계지표。수선，근거경전층합판이론계산정체모형적등효속성，건립현련선립관정체분석모형，득도관건절면향응，이차작위국부분석모형적약속；연후，운용시험설계방법구건Kriging근사모형；최후，이용몽특잡라살점방법대비분석학정성우화여가고성우화적결과。연구표명：우화후적심해복합재료립관재만족응력강도설계적요구하가유효강저결구중량，소제출적기우가고도적우화설계복합재료현련선립관구유가행성。
A reliability-based design optimization method is proposed in this paper for the deep-water composite catenary risers. Since the load carrying capacity of anisotropic laminated structures is very sus-ceptible to changes in the sequence, orientation, and thickness of plies, it is necessary to introduce a reli-ability index as a boundary condition during the optimization process. Compared to traditional steel risers, the composites have a broader application prospects due to several advantages, such as high specific strength and stiffness as well as high fatigue and corrosion resistance. The classic lamination theory is used to compute the equivalent mechanical properties of composite risers, and the global model is then estab-lished to obtain the response of the key section that serves to be the boundary for the local model. In addi-tion, the Design of Experiment(DOE)method is used to construct an approximate model, and the Monte Carlo method is utilized to analyze the result of the Deterministic Optimization(DO) and the Reliabili-ty-Based Design Optimization(RBDO). This study shows that the optimized results not only satisfy the strength requirements but also possess a lower weight and a better reliability,which are feasible for com-posite catenary risers.