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三体船重量分布对波浪载荷的影响 总被引:1,自引:1,他引:0
三体船根据执行任务、续航时间、航行区域等实际要求,存在着不同的载重状态。文中基于三维势流理论和简单格林函数法,分别对三体船4种典型重量分布情形下的剖面波浪载荷进行长期预报,比较分析了纵向重量分布对三体船波浪载荷的影响。结果表明,三体船全船纵向重量分布更加均匀,有助于降低剖面波浪载荷。 相似文献
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在风力发电设备安装船的典型装载工况下,应用三维势流理论进行波浪诱导载荷长期预报,以主要载荷控制参数为依据进行设计波的选取,应用DNV的SESTRA模块将设计波载荷施加于船体进行船体结构直接计算分析。计算结果表明:船体结构设计均满足要求。 相似文献
38.
以国产CRH3型3节车编组高速列车为研究对象,利用计算流体力学软件Star-CD/CCM+计算了在不同横风风速和不同车速下的列车气动力荷载;将该荷载导入动力学仿真软件SIM-PACK的列车运行动力学模型中,计算出在不同横风和车速条件下的脱轨系数、减载率和倾覆系数等运行稳定性参数.计算表明:头车的气动性能和运行稳定性受横风的影响最大;根据车辆动力学性能参数确定的列车安全速度限值与横风风速之间并非线性关系.参照有关高速列车运行稳定性评定标准,给出了不同横风风速下高速列车安全运行的速度限值. 相似文献
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RENHui-long ZHANGHai-bin DAIYu-zhi SONGJing-zheng 《船舶与海洋工程学报》2003,2(1):1-10
A three-dimensional method of calculating wave loads of turret moored FPSO (Floating Production Storage and Offloading) tankers is presented. The linearized restoring forces acting on the ship hull by the mooring system are calculated according to the catenary theory, which are expressed as the function of linear stiffness coefficients and the displacements of the upper ends of mooring chains. The hydrodynamic coefficients of the ship are calculated by the three-dimensional potential flow theory of the linear hydrodynamic problem for ships with a low forward speed. The equations of ship motions are established with the effect of the restoring forces from the mooring system included as linear stiffness coefficients. The equations of motions are solved in frequency domain, and the responses of wave-induced motions and loads on the ship can be obtained. A computer program based on this method has been developed, and some calculation examples are illustrated. Analysis results show that the method can give satisfying prediction of wave loads. 相似文献
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Kuniaki Shoji Rajesh Ramachandran Yuzo Kurobe Yasuhisa Hashizume 《Journal of Marine Science and Technology》2002,7(2):86-90
As a result of frequent marine disasters leading to the loss of human life and pollution of vast areas of the ocean, ship
manoeuvrability has become a very important characteristic of ship design. Among several recent experimental techniques to
determine ship manoeuvrability, the most popular is captive model testing using a planar motion mechanism (PMM). This article
describes some tests, analyses, and results of PMM tests in a circulating water channel (CWC) using a model of a training
ship. The hydrodynamic forces and moments acting on a model of the training ship Shioji Maru in pure yawing motion were measured, and hydrodynamic derivatives were obtained using two different methods of analysis:
singular value decomposition (a least-squares fit method) and Fourier analysis. Derivatives obtained from the tests were used
to simulate the turning trajectory of the actual ship, and these were compared with the results of sea trials. The results
indicate that both methods of analysis yield fairly similar derivatives. The simulation results were also found to be a close
match with the trial results.
Received: February 7, 2002 / Accepted: May 14, 2002
Address correspondence to: K. Shoji (shoji@ipc.tosho-u.ac.jp) 相似文献