共查询到20条相似文献,搜索用时 171 毫秒
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船对船驳载作业,当两船旁靠并排装卸货时,为了避免两船直接碰撞造成危险,需要在相互旁靠的两舷之间设置足够吸收其冲击能量的橡胶护舷和附件。介绍了护舷设备组成、OCIMF规则的推荐布置、碰垫的理论选取方法,并以55000DWT自卸船为例,介绍了实船碰垫的选取和安装。对船舶起到更好的防护作用。 相似文献
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船舶靠绑作业系统试验模拟与测试技术 总被引:2,自引:0,他引:2
风浪作用下船舶系泊靠绑进行补给、救生与货物转运等作业是一个非常复杂的过程,在波浪水池中进行模型试验,了解靠绑作业系统的运动和受力特性,必须考虑每一个细节.本文针对系泊靠绑模型试验,重点介绍了缆绳、碰垫非线性弹性特性和系泊缆绳上补偿力模拟与测试方法,以及靠绑船舶的运动响应测试,并给出了部分模型试验结果.从模拟的缆绳和碰垫弹性曲线及系泊缆绳上补偿力试验结果来看,文中所用的缆绳、碰垫和缆绳上补偿力模拟方法是成功的,非接触式光学运动测量系统能方便地进行靠绑船舶运动响应测试,可以应用于今后其他类似模型试验中去. 相似文献
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波浪中并靠两船运动计算 总被引:3,自引:1,他引:2
文章用切片理论的二维格林函数法求取流场速度势,用线性弹簧取代系缆和碰垫,解并靠两船的联立运动方程,得到了两船在规则波中的各自由度运动幅值,用谱分析法得出两船在不规则海浪中运动的统计规律. 相似文献
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能见度不良是造成舰船碰撞事故发生的主要原因,为防止舰船碰撞,从转向与减速2个角度提出能见度不良时舰船避碰辅助决策方法。在能见度不良条件下,将目标舰船同其他舰船间的转向避碰问题定义为多目标函数优化问题,以同其他会遇舰船间的碰撞危险度充分下降、最大限度降低转向角度、目标舰船转向航行最少时间内恢复初始航向与航速为目标函数。能见度不良造成可视距离较小,在单独采用转向避碰决策无法有效实现避碰目的的情况下,需结合舰船变速避碰,以碰撞危险度与变速能量损失最小为目标函数,通过求解各目标函数,获取舰船转向幅度与降速决策信息。实验结果显示,当能见度不良时,舰船在不同会遇条件下均能够有效实现避碰目的。 相似文献
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升船机承船厢对接过程是升船机运行全过程中重要的一环,对接过程中船厢内的水面波动直接影响厢内船舶的安全停靠和水力式升船机同步轴工作条件。针对这一过程中厢内水面波动变化特性对升船机安全运行的影响,进行了在不同对接水位差启闭卧倒门和在不同航速进出船厢的500吨级船舶实船试验。重点探讨了对接水位差、船舶进出船厢航速对厢内水面波动特征值的影响,给出了船厢内波动振幅与水深和水位差的经验公式,分析其对船厢和船舶航行安全的影响。实船试验成果验证了景洪升船机500吨级船舶通航安全性。 相似文献
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In order to assess the possible collision effect, a numerical simulation for the upper module and spar platform docking at the speed of 0.2 m/s was conducted by using the software ANSYS/LS-DYNA, and the time history of the collision force, energy absorption and structural deformation during the collision was described. The purpose was to ensure that the platform was safely put into operation. Furthermore, this paper analyzes different initial velocities and angles on the Von Mises stress and collision resultant force during the docking collision. The results of this paper showed that the docking could be conducted with higher security. The data in this paper can provide useful references for the determination of the upper module's offshore hoisting scheme and practical construction by contrasting the numerical simulation results of the parameters on the docking collision. 相似文献
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In order to assess the possible collision effect, a numerical simulation for the upper module and spar platlbrm docking at the speed of 0.2 m/s was conducted by using the software ANSYS/LS-DYNA, and the time history of the collision force, energy absorption and structural defonamtion during the collision was described. The purpose was to ensure that the platlbrm was safely put into operation. Furthermore, this paper analyzes different initial velocities and angles on the Von Mises stress and collision resultant force during the docking collision. The results of this paper showed that the docking could be conducted with higher security. The data in this paper can provide useful references for the determination of the upper module's offshore hoisting scheme and practical construction by contrasting the numerical simulation results of the parameters on the docking collision. 相似文献
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靠系泊作业监控系统集成 总被引:1,自引:0,他引:1
报道世界上最近建成的油气码头安装仪器设备对风、波、流、潮位,船舶靠速、接岸距离、靠泊夹角、漂移,乃至系缆力、船舶吃水,护舷变形以及输油(液气)臂的工作状态实施综合监控。 相似文献
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Marine engineering structures may be subjected to various levels of vessel collisions, causing different degrees of damage to the RC piles. However, the influence of different combinations of impact mass and velocity under the same initial kinetic energy or momentum on the impact behavior of RC piles has not been explored. A numerical investigation of the impact responses of RC pile structures (including plumb piles and inclined pile groups) considering the material strain rate effect is carried out using the software ABAQUS/Explicit in this paper. Parametric studies are conducted based on the validated finite element models of RC piles subjected to horizontal impact. The internal force distributions, as well as the effect of the impact kinetic energy and the momentum (including different combinations of impact mass and initial velocity) on the impact response of RC piles, are discussed. The results indicate that the development path of the bending moment‒overall structural displacement curves in the plastic hinge regions of RC piles are almost identical under both impact and static loading conditions. Compared to momentum, the impact response of RC piles is insensitive to the variation of impact kinetic energy with different combinations of impact mass and velocity. Therefore, the impact kinetic energy is more suitable for evaluating the structural deformation of RC piles after impact. Finally, a performance-based impact-resistance design framework for RC piles is proposed. 相似文献