斜支柱小水线面双体船初稳性特征研究

对斜支柱小水线面双体船初稳性进行研究分析.在直支柱小水线面双体船的原理基础上,结合支柱倾斜所产生的问题和特殊性,分析得出了斜支柱小水线面双体船初稳性的计算方法并编写Fortran程序简化计算.进行实例计算,计算结果表明斜支柱小水线面双体船初稳性好于直支柱.随着支柱与水线面夹角逐渐减小,初稳性高GM增大.     

小水线面双体船支柱斜度对其耐波性能影响分析

基于三维势流理论,本文研究了不同支柱倾斜角度的小水线面双体船在设计航速下的耐波性能。将规则波中的运动响应幅值函数与海浪谱结合得到运动统计有义值。对比不同支柱倾斜角度的频率响应曲线,发现在相同海况条件下随着支柱倾斜角度增加,垂荡和纵摇峰值降低。结果表明,通过倾斜支柱可增加船舶运动的附加质量和阻尼,削弱频率响应曲线共振峰。     

小水线面双体船支柱斜度对其耐波性能影响分析

基于三维势流理论,本文研究了不同支柱倾斜角度的小水线面双体船在设计航速下的耐波性能。将规则波中的运动响应幅值函数与海浪谱结合得到运动统计有义值。对比不同支柱倾斜角度的频率响应曲线,发现在相同海况条件下随着支柱倾斜角度增加,垂荡和纵摇峰值降低。结果表明,通过倾斜支柱可增加船舶运动的附加质量和阻尼,削弱频率响应曲线共振峰。     

外倾支柱式小水线面双体船结构的有限元分析

本文分析了小水线面双体船波浪载荷预报的几种方法,比较了准静态法、刚体动力学法、水弹性法、经验公式法的优缺点,讨论了结构有限元离散的注意事项,以及斜支柱结构形式对动载荷和疲劳的有利因素。并对全船进行了有限元应力分析,获得了全船总体应力响应以及应力集中区域的应力分布特点。     

直/斜支柱SWATH的兴波阻力预报

斜支柱小水线面双体船(SWATH)除具备常规SWATH优异的阻力及耐波性能以外,还具有优良的隐身性能,目前世界上唯一一艘斜支柱SWATH是美国海军建造的“Sea Shadow”号。本文针对一型直支柱SWATH和自行开发的一型斜支柱SWATH,以Noblesse的新细长船兴波阻力理论为基础,开发了一种新的算法,所预报的兴波阻力与试验结果吻合良好。本文的工作可用于直／斜支柱SWATH船型的开发和优化。     

支柱形式对小水线面双体船波浪增阻和运动响应的影响

以小水线面双体船(small water-plane area twin hull, SWATH)为研究对象,基于计算流体力学理论,运用STAR-CCM~+,研究了SWATH的不同支柱形式对其波浪增阻及耐波性能的影响.首先对Delft-372双体船进行数值仿真计算并将运动和阻力增值与试验数据对比,验证了文中计算方法的可行性.之后分别针对不同的支柱间距、支柱斜度及单双支柱形式开展了数值计算,经对比分析发现,SWATH支柱的斜度和间距对其增阻及运动响应有显著影响,为今后SWATH船型设计和优化提供了新的方向.     

小水线面双体船耐波性预报

采用Choung M.Lee改进的切片理论及其公式,编制小水线面双体船耐波性预报软件.该软件可用于在各种波向角时,对不同航速小水线面双体船匀速航行中的运动响应进行预报,包括在规则波或不规则波中的垂荡、纵摇、横荡、横摇、首摇幅值预报,以及其它耐波性统计特性预报.利用本预报软件对某型试验船的耐波性能进行了计算,并与试验结果进行了比较分析,计算结果符合小水线面双体船的耐波性规律.本预报方法可为小水线面双体船的船型设计和稳定鳍选择提供耐波性方面的理论依据.     

小水线面双体船耐波性预报

采用Choung M．Lee改进的切片理论及其公式，编制小水线面双体船耐波性预报软件。该软件可用于在各种波向角时，对不同航速小水线面双体船匀速航行中的运动响应进行预报，包括在规则波或不规则波中的垂荡、纵摇、横荡、横摇、首摇幅值预报，以及其它耐波性统计特性预报。利用本预报软件对某型试验船的耐波性能进行了计算，并与试验结果进行了比较分析，计算结果符合小水线面双体船的耐波性规律。本预报方法可为小水线面双体船的船型设计和稳定鳍选择提供耐波性方面的理论依据。     

改进型双支柱SWATH的兴波阻力研究

以一艘用于内河渡轮的双支柱小水线面双体船(SWATH)为研究对象,提出不同于传统设计的片体艏部形状,并调整前支柱位置,利用Shipflow软件对片体、支柱两者之间的兴波干扰以及船舶整体的兴波阻力进行计算和比较,得到片体艏部型线和前支柱位置对船体兴波阻力的影响,并以此为依据提出了此种船型的改进方案.     

小水线面双体船性能初探

小水线面双体船因其优异的耐波性能而成为当前重要的高性能船型之一。本文概述了小水线面双体船的发展进程和国内外的研究状况,重点分析了小水线面双体船在快速性、耐波性等水动力性能和结构设计上的特点,以期能给我国高性能船型尤其是小水线面双体船的开发提供参考。     

小水线面双体船兴波阻力数值仿真研究

建立小水线面双体船的基本计算模型,分别改变片体吃水、主体长径比、片体间距、支柱长度和支柱与主体最大横剖面间纵向距离,采用SHIPFLOW软件对兴波阻力系数进行数值仿真计算。根据计算结果,分析各船型要素对兴波阻力系数的影响规律,为小水线面双体船的船型设计提供参考。     

Mathematical model of small water-plane area twin-hull and application in marine simulator

Small water-plane area twin-hull（SWATH） has drawn the attention of many researchers due to its good sea-keeping ability.In this paper,MMG＇s idea of separation was used to perform SWATH movement modeling and simulation;respectively the forces and moment of SWATH were divided into bare hull,propeller,rudder at the fluid hydrodynamics,etc.Wake coefficient at the propellers which reduces thrust coefficient,and rudder mutual interference forces among the hull and propeller,for the calculation of SWATH,were all considered.The fourth-order Runge-Kutta method of integration was used by solving differential equations,in order to get SWATH＇s movement states.As an example,a turning test at full speed and full starboard rudder of ‘Seagull＇ craft is shown.The simulation results show the SWATH＇s regular pattern and trend of motion.It verifies the correctness of the mathematical model of the turning movement.The SWATH＇s mathematical model is applied to marine simulator in order to train the pilots or seamen,or safety assessment for ocean engineering project.Lastly,the full mission navigation simulating system（FMNSS） was determined to be a successful virtual reality technology application sample in the field of navigation simulation.     

Dynamic response of a SWATH vessel for installing pre-assembled floating wind turbines

New and efficient installation concepts which can reduce the cost of developing an offshore wind farm are of particular interest. This paper explores a promising concept using the small water-plane area twin-hull vessel (SWATH) to install pre-assembled wind turbines (OWT) onto floating spar foundations. A focus is placed on the hydrodynamic performance of the SWATH and the response analysis of the coupled SWATH-spar system. Firstly, the numerically calculated difference-frequency wave force effect and damping forces of the original SWATH were verified with experimental data. Secondly, the original SWATH was modified to satisfy the criteria of weight-carrying capacity and hydrostatic stability. Thirdly, a multibody numerical model for the SWATH-spar system was developed, in which the hydrodynamic and mechanical couplings between the SWATH and a spar were considered. The SWATH is equipped with a dynamic positioning system to counteract the slow-drift wave force effects. The nonlinear time-domain simulations were carried out for the mating stage when a wind turbine is lifted above the spar foundation. Based on the analysis of statistics of the relative displacement and velocity of the tower bottom and the spar top, the installation concept with SWATH is found to be of decent performance. Finally, recommendations are provided for future research on this concept, which contributes to developing next-generation installation concepts for bottom-fixed and floating wind farms.     

Resistance and seakeeping numerical performance analyses of a semi-small waterplane area twin hull at medium to high speeds

The hydrodynamic analysis of a new semi-small waterplane area twin hull (SWATH) suitable for various applications such as small and medium size passenger ferries is presented. This may be an attractive crossover configuration resulting from the merging of two classical shapes: a conventional SWATH and a fast catamaran. The final hull design exhibits a wedge-like waterline shape with the maximum beam at the stern; the hull ends with a very narrow entrance angle, has a prominent bulbous bow typical of SWATH vessels, and features full stern to arrange waterjet propellers. Our analysis aims to perform a preliminary assessment of the hydrodynamic performance of a hull with such a complex shape both in terms of resistance of the hull in calm water and seakeeping capability in regular head waves and compare the performance with that of a conventional SWATH. The analysis is performed using a boundary element method that was preliminarily validated on a conventional SWATH vessel.     

水翼辅助推进船舶波浪中运动和增阻特性研究

基于在船首两侧增添（固定）水翼的水翼辅助推进船舶的设想,选取集装箱船型作为研究对象,采用三维面元法对原型和水翼船在规则波中的运动和增阻响应进行了预报,并与试验结果进行比较,验证了计算结果的准确性。研究结果表明水翼能够有效地减小船舶在波浪中的纵摇、垂荡和增阻响应,其中添加水翼船在波浪中的纵摇和垂荡响应峰值分别减少了21%和24%,而增阻响应则减小了80%。此外还对水翼展弦比和安装位置对船舶在波浪中的运动和增阻响应的影响进行了研究。     

新型小水线面双体船阻力和耐波性数值模拟分析（英文）

The hydrodynamic analysis of a new semi-small waterplane area twin hull(SWATH) suitable for various applications such as small and medium size passenger ferries is presented. This may be an attractive crossover configuration resulting from the merging of two classical shapes: a conventional SWATH and a fast catamaran. The final hull design exhibits a wedge-like waterline shape with the maximum beam at the stern; the hull ends with a very narrow entrance angle, has a prominent bulbous bow typical of SWATH vessels, and features full stern to arrange waterjet propellers. Our analysis aims to perform a preliminary assessment of the hydrodynamic performance of a hull with such a complex shape both in terms of resistance of the hull in calm water and seakeeping capability in regular head waves and compare the performance with that of a conventional SWATH. The analysis is performed using a boundary element method that was preliminarily validated on a conventional SWATH vessel.     

三体船耐波性预报

应用三维势流理论,计算了三体船在不同航速下垂荡、纵摇、横摇运动频率响应函数。预报了三体船在不规则波中各种海况下航行时的运动和加速度有义值,同时分析了三体船在西北太平洋海区一定海况下的运动特征和规律,最终根据舰船耐波性衡准要求,确定了三体船适合航行的海况与航速,为三体船耐波性方面得出了有价值的参考。     

高耐波隐身船型设计

具有优良耐波性和隐身性的舰船是当前世界各海军强国舰艇平台技术研究的重要发展趋势。以往舰艇的雷达波隐身设计主要是对上层建筑和舰面设备进行外形隐身设计,对主船体很少进行雷达波隐身设计,主要是因为主船体的隐身设计可能会影响其航行性能。为进一步提高舰船的隐身性和耐波性,本文以几千吨级舰艇为对象,在对船体进行隐身设计的基础上,以深V船型作为设计船体水线以下部分的基础线型,通过对底升角、首部吃水、尾部形状、长宽比和底面的凹凸进行优化,对比在不同情况下的耐波性和阻力,对船舶运动及水动力性能进行分析,提出了一种适用于未来隐身水面舰艇的高耐波性船型。