Multi-objective optimization study on dimensions of medium-sized cruise ship in concept phase北大核心CSCD

［Objective］Aiming at the problem of too many influencing factors and too little reference data for determining the dimensions of medium-sized cruise ships in the concept phase, a simplified multi-objective optimization method based on the fitting of dimensions and performance is proposed. ［Method］First, the dimension relations of medium-sized cruise ships are analyzed and the influence of the latest SOLAS requirements used to determine the optimization range. Second, the influence of cruise ship dimensions on space, resistance, stability and seakeeping are analyzed. Next, based on the principles of genetic algorithms, a multiobjective optimization algorithm with high robustness and high engineering adaptability is determined to establish a multi-objective optimization model for the concept design of medium-sized cruise ships. Finally, the Pareto solution obtained by multi-objective optimization is analyzed to provide initial references for determining the dimensions of the target cruise ship. ［Results］Implemented via a genetic algorithm, the optimization program proposed herein is applied in the concept design of a medium-sized cruise ship in order to optimize the initial dimensions, thereby achieving the expected outcome of providing reasonable initial dimensions for cruise ship design. ［Conclusion ］ The proposed simplified multi-objective optimization model can provide feasible initial dimensions for medium-sized cruise ships in the concept phase. As the Pareto solution obtained by multi-objective optimization has different focuses such as resistance and stability, the most suitable solution needs to be selected according to the design object. © 2023 Chinese Journal of Ship Research. All rights reserved.     

基于社会力模型的邮船舱段疏散滞后性分析

针对邮船遭遇紧急事件时乘客疏散过程中的滞后问题,基于社会力模型并应用逐段分析法分析在不同情景下的人员疏散过程。计算结果表明,随着滞后时间的增长,舱室内乘客的疏散效率逐渐降低。最危险的情况是在疏散开始时滞后3个舱段,人员疏散有效时间在平均疏散时间中占比不及50%,总时间是无滞后疏散的2倍。研究方法对邮船及其他类型客船的人员疏散流线设计具有一定的参考意义。     

中型邮船甲板薄板分段吊装方案

以中型邮船的3种典型甲板薄板分段为例，设计相应吊装方案，探讨起吊设备在整个吊运过程中影响建造效率的因素。采用有限元分析方法，计算3种薄板分段在不同工况条件下的强度和变形，并对发生超大变形的分段提出临时加强方案。结果表明，该吊装方案适用于甲板薄板分段结构强度弱的特点，满足中国船级社（CCS）吊装规范要求，可使中型邮船甲板薄板分段的吊装作业更加便捷和高效。     

基于预测恒定车头时距策略的自适应巡航控制研究

为了进一步提高车辆跟车过程中的跟踪性、安全性、舒适性和燃油经济性，针对已有间距策略表现过于保守或反应过于激烈等不足之处，提出了一种预测恒定车头时距策略。该策略考虑了相对加速度，建立了一种预测型期望车间距模型，进而应用于模型预测控制的多目标自适应巡航控制系统中，能进一步提高模型预测控制对多个控制目标的综合协调能力。搭建上层控制器、下层PID控制器、油门制动切换、逆纵向动力学模型。在多工况下仿真，通过建立性能评判指标对多目标进行量化分析。结果表明，所提出的间距策略在保证安全性的前提下，提升了自适应巡航控制系统的综合性能。在不同驾驶风格的车头时距下，跟踪性、舒适性和燃油经济性均有良好表现。     

Cargo ship aft panel stresses prediction by deconvolution

This article introduces novel extreme value prediction method that can be used for a variety of offshore engineering applications. First, to demonstrate the novel method, fictitious data from a non-linear Duffing oscillator and measured wave heights were used as examples. The second incident included a container ship that experienced significant deck panel strains while traveling across the Atlantic Ocean in bad weather. The main concern for cargo ship transportation is potential loss of container owing to violent movements. It is challenging to model such a situation because waves and ship motions are both non-stationary and complicatedly nonlinear. Extreme motions greatly increase the role of nonlinearities, activating effects of second and higher order.Furthermore, due to the scaling and the choice of sea state, laboratory testing may also be called into doubt. Therefore, data collected from actual ships during difficult weather voyages offers a special perspective on the statistics of ship motions.This paper aims to highlight an alternative method of extrapolation that is based on intrinsic properties of the data set itself and does not assume any extrapolation functional class. Extreme value predictions typically originate from certain statistical distribution functional classes to fit the data and then extrapolate. Engineering design can make use of the unique extrapolation method that has been proposed. The proposed method's forecast accuracy has been verified in comparison to the Averaged Conditional Exceedance Rate (ACER) extrapolation method.     

概念设计阶段的邮船横移操纵性评估方法

为准确评估邮船的横移操纵性，对概念阶段的某中型邮船的横移抗风性展开研究。考虑邮船上层建筑高大的特点，在由侧推器、螺旋桨、舵所组成的横移平衡计算模型中，增加风载荷及力矩，并依据现有的初步设备参数，计算13个风向角所能承受的最大风速，预测邮船在码头的横移抗风操纵性能力。通过实例计算验证，此评估方法能够清晰便捷地评估邮船在不同风况下的横移抗风能力，为邮船概念设计阶段的横移操纵性提供重要支撑。     

基于蒙特卡洛方法的邮船建造质量评价体系不确定性分析

为避免因建造质量问题导致的后续返工，需要在邮船建造过程中对建造质量进行控制，一套合适的建造质量评价体系可客观地反映建造质量，为质量控制提供标准。建立邮船建造质量评价体系的结构和数学模型，各部分的权重可使用层次分析法（Analytic Hierarchy Process，AHP）或德尔菲法确定，并使用蒙特卡洛方法对该体系的不确定性进行研究。结果说明该体系具有较好的稳健性。船厂在使用该体系时需要结合实际情况，尤其应注意内装质量部分的权重。     

豪华邮船洗衣房噪声源测量与舱室噪声分析

为研究豪华邮船噪声控制技术，需对豪华邮船振动噪声源进行全面的分析。以豪华邮船主洗衣房噪声源为例，使用扫描声强法确定其声功率，将设备声功率作为统计能量分析的输入，预报豪华邮船洗衣房及其相邻舱室的噪声，评估洗衣房噪声源对舱室噪声水平的影响程度，同时研究邮船内装材料对洗衣房噪声的控制作用。豪华邮船洗衣房噪声源对主洗衣房影响较大，且典型邮船内装材料可显著降低洗衣房舱室噪声。上述研究内容可为后续豪华邮船各类处所稳态噪声源的测量分析提供参考。     

中型豪华邮船舱室模块吊运工装有限元分析

针对邮船舱室模块缺少强框架支持和易产生吊装变形等问题，对比4种常见的舱室模块吊装方式，分析在吊装过程中舱室模块容易变形的原因。以某中型豪华邮船舱室模块为例，设计一种吊运工装，利用有限元分析方法，计算吊运工装在不同工况条件下的结构强度和结构变形，并对其进行优化。结果表明，优化的吊运工装其结构强度满足中型豪华邮船舱室模块的吊装需求，可减少舱室吊装变形，提升船厂舱室模块吊装的安全性和高效性。