双船联合举升多体协同作业系统横摇稳性评估

基于ADAMS平台,构建特定场景双船联合举升多体协同作业系统虚拟样机,对新型一体化拆解作业双船联合举升过程中待拆除组块横摇稳性进行预测与评估。构建了该系统拓扑模型,使用几何参数描述系统中上部组块横摇运动特征;通过虚拟样机仿真探究了双船不同耦合运动情况时上部组块最危险失稳状态,并分析了上部组块重心至连接点连线垂直距离与水平距离比值对横摇角度的影响规律。结果表明:物理模型试验数据驱动的虚拟样机技术可以有效评估该系统运动特征,与几何拓扑模型得到的上部组块横摇失稳角度理论公式计算结果吻合;双船同相位横摇与反相位垂荡耦合运动时对上部组块横摇稳性影响最大;待拆除上部组块横摇失稳时的极限纵横比可以作为复杂多体系统横摇稳性评估参数,为实际工程方案选择提供参考。     

采油平台在海上风电支撑体系中的应用研究

海上风电安装和并网成本是制约其发展的行业瓶颈之一.现有油气田的海洋平台有经济并网条件和改造成风电支撑结构的技术可能性.本文通过比较采油平台和风电格构式支撑组成的两种结构体系的动力性质,分析了固有频率约束限制对风电支撑结构改造的影响,以及环境荷载引起的荷载效应在两种体系上的不同分配机理.考虑环境荷载动力放大性质,通过风机额定运转与特定海区浪流荷载组合作用下两种支撑结构体系的刚度和强度特点分析,给出了风电支撑结构的受力特点和利用采油平台作为风电支撑结构的注意事项.该结论可作为海上类似风电支撑结构的设计参考.     

Dynamic Analysis for Two Kinds of Jacket Platforms under Wave Force

A detailed finite element analysis is presented in this paper in order to obtain the different vibration properties of two kinds of fixed jacket platforms under wave force. More attention is paid to the platform with prism shape jacket because of its more possibly excessive vibration in service than that of the jacket platform with slant piles. Numerical simulations are compared with the results from actual platform test and an effective strengthening technique is proposed. The conclusion of the paper may be taken as the ha-sis of following control work. It also gives some guidance to the future design of the frxed platform with prism shape jacket.