深水FPSO船体波浪砰击载荷试验和结构分析

Wave slamming load test and structural analysis on deep water FPSO hull

某深水浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)船体设计为超肥大简易折角线型,须校核FPSO船体抗波浪砰击结构强度。基于德国劳氏船级社(Germanischer Lloyd Noble Denton) GL0030/ND Guidelines for marine transportations和航线环境条件确定了FPSO远洋拖航设计环境条件和载况,针对FPSO在位作业极端环境工况和远洋拖航自存工况,开展了耐波性能水池模型试验,研究了FPSO船首、尾处的波浪砰击载荷,重点分析了远洋拖航自存工况的波浪砰击载荷特性、不同波浪谱峰周期、浪向时的波浪砰击载荷分布,确定了超出法国船级社(Bureau Veritas)NR445 Rules for the calssification of offshore units和NR467 Rules for the classification of steel ship的FPSO船体抗波浪砰击设计要求。试验结果表明,未发现FPSO船尾主甲板上浪现象,验证了船尾线型设计的可行性。FPSO船首、尾结构做了特别加强,应用PATRAN/NASTRAN软件分析了FPSO船体强度,满足法国船级社规范要求。研究结果对深水FPSO船体结构设计有借鉴作用。

A deep water floating production storage and offloading( FPSO) hull is designed as super fat,simple angular lines shape.It is necessary to check the FPSO hull structural strength against wave slamming.The environmental conditions and load cases for FPSO ocean towing design is determined based on Germanischer Lloyd Noble Denton GL0030/ND Guidelines for Marine Transportations and environmental condition of the towing route.The sea keeping performance tank model test is carried out to study wave slamming load at FPSO bow and stern under on-site operation extreme environmental conditions and ocean towing survival condition,focusing on the analysis of wave slamming load characteristics and load distribution for different peak period of wave spectrum and wave direction under ocean towing,so that the design requirements for FPSO hull wave slamming that exceed Bureau Veritas Classification Society NR445 Rules for the calssification of offshore units & NR467 Rules for the classification of steel ship are determined.The main results reveal that no green water on FPSO main deck at the stern is found,which verifies the feasibility of the design of lines shape at the stern.FPSO bow and stern structure is specially strengthened,and hull strength is analyzed by PATRAN/NASTRAN software,which meets Bureau Veritas Classification Society rules’ requirements.This paper can be used as a reference for the hull structure design of deep water FPSO.