Accelerated second-order hydrodynamic load calculation on semi-submersible floaters

A rapid method for calculation of second-order hydrodynamic wave loads on semi-submersible platforms is developed and validated against radiation–diffraction theory. The method is based on slender-body theory and builds on modal truncation of the quadratic transfer function (QTF). The semi-submersible floater is split into individual members and the existing theory for vertical cylindrical columns is extended to include the heave force. Further expressions for the surge, heave and pitch load on the horizontal pontoons are derived and implemented. The accuracy of the method is assessed by comparison to radiation–diffraction results using the Pinkster approximation. We find that the slender-body approximation for the column surge force is most accurate for small values of the diameter-to-draft ratio. For the three sea states considered, this error is below 10% for diameter-to-draft ratios less than 0.2.Error analysis is provided for the column heave and pitch and the pontoon loads. For all members, application of 128 modes in the QTF approximation is found sufficient to accurately represent the full slender-body QTF solution.Next, the first- and second-order loads on the full floater under different sea state conditions are compared to radiation–diffraction theory. With 128 modes, the second-order loads are obtained 2500 times faster than with conventional approaches with error levels of 22% for surge, 10% for pitch and zero error for heave. The surge error is discussed and linked to the small draft of the columns. The numerical efficiency of the method allows the consideration of second-order loads in the first stages of the design and optimisation of semi-submersible floaters.     

海洋油气平台油气分离中控系统仿真开发

从海洋油气平台油气分离中控系统的控制逻辑出发，简化抽取油气分离系统主要部件的控制模型，采用分段线性函数近似处理原本复杂的流量函数和容积函数，降低模拟仿真难度。在Unity3D中实现海洋油气平台油气分离中控系统作业仿真，可为海洋油气平台研发提供必要支持。     

海洋工程建造用结构钢材的数据分析

为降低材料成本,需要通过数据分析的方法对海洋工程建造阶段的材料管理和利用进行分析。首先确定数据分析的思路和基本过程,然后从多个方面对材料利用率进行分析,提出提高材料利用率的原则和方法。同时从项目整体的角度出发,辩证分析材料利用率对采办、施工、仓储的影响。结合项目实践,进一步分析材料历史数据的累积和运用,对提高后续项目的材料管理有一定的借鉴意义。     

机器人智能焊接技术在甲板片体框架结构上的应用

针对甲板片体框架结构特点和机器人智能化焊接工艺要求，在合理的甲板片体分段划分基础上，综合运用机器人智能控制、离线编程、焊接工艺数据库和视觉识别等技术，完善机器人焊接作业流程，优化机器人焊接分段作业顺序，提高机器人焊接可达性，可进一步提高甲板片体框架结构机器人智能焊接技术应用水平。     

半潜浮式风机的动力响应分析

OC4半潜浮式风机综合性能较好，但其浮式基础结构质量和结构复杂性使其建造成本高昂，而WindFloat半潜浮式风机浮式基础具有结构简单、建造成本低和减摇效果好等优点，但是适应水深较小且只适合特定海域。结合OC4和WindFloat半潜浮式风机浮式基础的结构特点，针对200 m水深环境设计OC4-WindFloat半潜浮式风机基础。基于叶素理论、莫里森公式和势流理论，通过有限元软件对OC4-WindFloat半潜浮式风机的固有周期及风浪联合作用下的动态响应进行耦合分析，并与OC4半潜浮式风机结果进行对比研究。结果显示，OC4-WindFloat半潜浮式风机固有周期及动态响应均满足相关规定，且具有比OC4更低的建造成本，相比WindFloat可适用更深的海域。研究结果对于浮式基础型式研究有一定的指导意义。     

一种远海油气作业后勤保障的浮式码头概念设计

提出一种基于浮式码头的后勤保障设计，以保障远海油气作业。根据油气作业后勤保障的基本功能需求，对浮式码头的功能体系进行设计，并初步确定主尺度。根据功能模块化体积限制，对船舶进行概念设计，确定浮式码头的主要特性。分析浮式码头的稳定性和系泊要求，对浮式码头概念设计进行数值模型验证。结果表明，浮式码头概念设计可满足我国远海油气作业需求，有望形成一种新型远海油气作业后勤保障的新模式。