共查询到18条相似文献,搜索用时 46 毫秒
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大开口型船舶波浪诱导载荷研究 总被引:4,自引:1,他引:4
通过对某5万t级大开口型船舶的各种波浪诱导载荷长期预报,详细讨论了不同波浪散布图、装载工况、航速、水动力计算理论和短峰波对波浪诱导载荷长期预报极值的影响,指出了一些值得注意的问题,以期对类似船型的液体波浪诱导载荷预报提供有用的参考。 相似文献
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为了能对江海通航船型的结构强度进行合理评估,根据载荷第一原则,按特定航线所在的E1海区的波浪统计资料,对该海区船舶的波浪载荷进行了系统研究,并给出了航行于该海区江海通航船的波浪附加弯矩、波浪附加剪力、波浪水平弯矩及波浪扭矩的长期预报值.本文的研究结果已纳入中国船级社《特定航线江海通航船检验指南》中,对特定航线江海通航船的发展起到了积极的推进作用. 相似文献
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浅水条件下的大型船体结构响应与常规水深下的相比有较大差异。由于船体运动及波浪诱导载荷的预报关乎系泊系统设计、船体疲劳寿命以及安全性评估,研究大型浮式生产储油卸油装置运动和波浪诱导载荷响应十分必要。通过研究15万吨级FPSO在极端环境条件下的响应极值,对该级别船体载荷及运动预报提出建议。结果表明,浅水条件下波长与船长比较接近时响应最大,且部分波浪力超出了规范设计值,这在设计中应予以重视。 相似文献
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采用数值分析软件Sesam/HydroD对某半潜式起重船在航行状态和起重作业状态下的波浪载荷进行长期预报和短期预报.在航行状态下,预报得到的最大波浪弯矩和剪力分别为规范值的1.4倍和2.0倍,用于进行结构疲劳评估(超越概率为10-2)的波浪弯矩最大预报值约为用于进行结构强度评估(超越概率为10-8)的波浪弯矩最大预报值... 相似文献
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深水钻井船波浪载荷预报 总被引:1,自引:0,他引:1
以两艘钻井船为例,分别计算其波浪载荷传递函数和波浪载荷长期预报值,将计算结果与规范计算值比较,且对其中一艘钻井船计算其不考虑月池开孔时的波浪载荷预报,试图找出钻井船与常规船型的差异,为结构设计人员在钻井船设计方面提供一定的借鉴。 相似文献
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30万吨FPSO运动响应短期预报 总被引:4,自引:0,他引:4
短期预报了一30万吨折角型线浮式生产储油轮FPSO(Floating Production Storage and Offloading System)在典型海况中的运动响应。横摇阻尼计及了舭龙骨的影响,并依据静稳性臂和计算海况下的有义横摇角对横摇回复力矩线性化,得到典型海况下的运动响应谱和统计值。 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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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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C.Guedes Soares 《Marine Structures》1993,6(5-6):475-483
A method is proposed for the long-term formulation of wave induced vertical bending moments in ship structures. The non-linearity of the response is represented by an uncertain modelling factor that is calibrated by experimental values. Long term predictions are obtained for a tanker and a container ship hull showing that only in the latter case is the response clearly non-linear and reproduced in the long-term predictions. 相似文献
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Gas explosions generally cause catastrophic damage to surrounding structures and humans. The application of blast wall can effectively prevent the damage. The uniform explosion load is widely used in assessing structural response, but it cannot represent the non-uniform characteristic of actual explosion pressures. The main contents of this paper are to study the effect of gas cloud characteristics on explosion pressure distribution, and analyze the effect of non-uniform loads on structural responses. The results reveal that the explosion loads have strongly spatial inhomogeneous when explosion scenarios have large sized cloud or long combustion distance. By establishing the overpressure-probability exceedance curves for uniform loading method and distributed loading method, based on the given accident frequency several design loads are determined. The structural responses of blast wall under design loads are assessed based on explosion evaluation acceptance criteria. It can be seen that the use of uniform loading method underestimates the structural response and misjudges the deformation pattern compared to actual explosion loads. Global and local explosion pressures should be considered simultaneously in the design specification. The overpressure-probability exceedance curves for non-uniform explosion pressures are recommended to establish the design load for blast wall. 相似文献
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