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首页> 外文会议>25th International Conference on Offshore Mechanics and Arctic Engineering 2006(OMAE2006) vol.2: Ocean Engineering; Polar and Arctic Sciences and Technology >INVESTIGATION AND OPTIMISATION OF BOAT DEPLOYMENT SYSTEMS AT HIGH SEAS
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INVESTIGATION AND OPTIMISATION OF BOAT DEPLOYMENT SYSTEMS AT HIGH SEAS

机译：高速船部署系统的调查与优化

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There is a multitude of seagoing missions such as rescue missions, coast guard and pilot duties, whose success depend on ship-deployed boats. Launching these boats from a mother ship or recovering them by special deployment systems in a broad range of environmental conditions are key operations for a successive mission.rnIn recent years, new boat deployment systems, promising better operational availability at high sea states, have evolved beyond the traditional side-davit system with dual falls. These new systems deploy their boats via stern ramps integrated into the transom of the mother ship, for example seen at numerous rescue cruisers around the world.rnThis paper presents two different boat deployment systems. After a short discussion of the disadvantages of side-davit systems, a new type of a stern boat deployment device, the so called Janssen Docking System, is introduced. This system is equipped with an articulated ramp hinged to the stern. Whereas launching operations are less critical, the recovery of boats is quite hazardous. For this operation mode structural forces on critical areas as well as the relative motions between the ramp and the small boat are systematically investigated in model tests. Based on the results of these sea keeping tests the feasibility of the system has been analysed and improvements are recommended.rnAs a second system a floodable dock integrated into a mother ship is presented. For launching and recovering small boats at high seas the swell inside the dock and thernresulting relative motions between boat and dock ship are investigated. This leads to critical flow conditions inside the harbour in terms of sloshing waves with heights up to 3 meters. The analysis of local flow phenomena inside the dock dependent on the motion of the ship in a given sea state are the basis for the development of an optimized dock shape. Therefore an existing nonlinear numerical method for unsteady viscous computation based on Volume of Fluid (VOF) methods and Reynolds Averaged Navier Stokes Equations (RANSE) is used to simulate these phenomena. The time domain calculation allows to change local dock shapes systematically for further improvements. To validate the numerical solution the calculated results are compared to sea keeping tests at model scale. The paper concludes with a perspective for the further development of the dock shape.
机译：有许多海上任务，例如救援任务，海岸警卫队和飞行员职责，其成功取决于部署船只的船只。在广泛的环境条件下从母舰上发射这些船只或通过特殊的部署系统对其进行回收是接连执行任务的关键操作。近年来，新的船只部署系统有望在公海州获得更好的可用性，其发展已超越传统的双侧偏吊架系统。这些新系统通过集成在母船尾部的船尾舷梯来部署船只，例如在世界各地的众多救援巡洋舰上都可以看到。本文介绍了两种不同的船只部署系统。在简短讨论了侧面吊艇架系统的缺点之后，介绍了一种新型的tern船展开装置，即所谓的詹森码头系统。该系统配有铰接在船尾的铰接式坡道。尽管下水操作的要求不高，但是回收船只是非常危险的。对于此操作模式，在模型测试中系统地研究了关键区域的结构力以及舷梯和小船之间的相对运动。根据这些海况测试的结果，分析了该系统的可行性并提出了改进建议。作为第二个系统，提出了一种集成到母船中的可浸水码头。为了在公海发射和回收小船，研究了船坞内部的膨胀以及由此产生的船与船坞之间的相对运动。这就导致了港内的严重水流条件，即波浪的高度高达3米。根据给定海况下船舶的运动来分析船坞内部的局部流动现象，是开发优化的船坞形状的基础。因此，使用现有的基于流体体积（VOF）方法和雷诺平均Navier Stokes方程（RANSE）的非稳态粘性计算非线性方法来模拟这些现象。时域计算允许系统地更改本地码头的形状，以进行进一步的改进。为了验证数值解，将计算结果与模型规模的海况测试进行比较。本文以对码头形状的进一步发展提出了展望。

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