Assessment of Investment Risk in Greek Short Sea Shipping： A Ro-Ro Passenger Ferry Case

The purpose of this paper is to introduce an innovative methodology in shipping investment evaluation based on simulation of a project cash flow. It concerns a complementary approach to current practices and its aim is to provide more information mainly to ship-owners that consider the feasibility of deploying Ro-Ro Passenger ferries. The paper examines a typical semi-conventional RoPax ferry operating in the Aegean Sea. It addresses important economic, operational and procedural issues concerning risk evaluation. The current status is that risk is a notion still strange to main stakeholders. The Greek practice in performing a feasibility study for a project draws on investor＇s experience and feeling aided by a preliminary economic study. The main thesis of this paper is that there are alternative techniques to evaluate investment risk and measure profitability of a project. A Monte Carlo simulation in collaboration with a typical Ro-Ro cash-flow model is implemented to reveal the extent of risk and provide a useful tool for the assessment of future investments in Greek Short Sea Shipping.

Dynamic analysis of multibodies system with a floating base for rolling of ro-ro ship caused by wave and slip of heavy load

Common effect of wave and slip of internal heavy load will make rolling of the roll-on ship serious. This is one of the important reasons for overturn of ro-ro ships. The multibodies System with a floating base is composed of ro-ro ship and slipping heavy load. This paper takes the rolling angle of the ship and the transverse displacement of the heavy load on desk as two freedoms. Making use of analysis of apparent gravitation and apparent buoyancy, the wave rolling moment is derived. By use of dynamic method of multibodies system with a floating base, dynamic equations of the system are established. Taking a certain channel ferry as an example, a set of numerical calculation have been carried out for rolling response of the ship and displacement response of the slipping heavy load under common effect of synchro-slipping heavy loads and wave.

Research on a Multi-grid Model for Passenger Evacuation in Ships

In order to enhance the authenticity and accuracy of passenger evacuation simulation in ships, a new multi-grid model was proposed on the basis of a traditional cellular automata model. In the new model finer lattices were used, interaction of force among pedestrians or between pedestrians and constructions was considered, and static floor fields in a multi-level exit environment were simplified into cabin and exit static floor fields. Compared with the traditional cellular automata model, the multi-grid model enhanced the continuity of the passengers'track and the precision of the boundary qualifications. The functions of the dislocation distribution of passengers as well as partial overlap of tracks due to congestion were realized. Furthermore, taking the typical cabin environment as an example, the two models were used to analyze passenger evacuation under the same conditions. It was found that the laws of passenger evacuation simulated by the two models are similar, while the simulation's authenticity and accuracy are enhanced by the multi-grid model.

SYNCHRONOUS EFFECT OF SLIPPING HEAVY LOADS ON RO-RO SHIP ROLLING IN WAVES

Common effect of wave and slip of internal vehicles will make rolling of the roll-on ship serious. This is one of the important reasons for overturn of ro-ro ships. The multibody system with a floating base is composed of ro-ro ship and slipping vehicles. Takes the rolling angle of the ship and the transverse displacements of the slipping vehicles on desk as freedoms. Making use of the analysis of apparent gravitation and apparent buoyancy, the wave rolling moment is derived. By means of dynamic method of multibody system, dynamic equations of the system are established. Taking a certain channel ferry as an example, a set of numerical calculation have been carried out for rolling response of the multibody system with a floating base of a ro-ro ship and displacements response of the slipping vehicles under common effect of free slipping vehicles and wave, and a conclusion has been drawn that the motion of the numerous free slipping heavy loads will trend to be synchronous under restraining of the side-wall bulkhead with time because of repeated collision.

面向船舶大型化的渤海湾适航客滚船船型尺度研究

为科学指导渤海湾客滚运输船舶合理大型化,统筹过海运输发展与安全,厘清客滚船大型化发展历程,研判市场需求、企业运营、行业管理等影响因素与供需矛盾。系统梳理客滚运输航线及港口布局特征,分析客滚运输企业及船舶运力结构分布,找准船港航一体化发展需求导向。基于海港总体设计规范中通航基础设施尺度的计算方法,采用逆向工程思维推导船型计算式,匹配调整理论结果、归并数值,提出渤海湾4种客滚船大型化标准船型,确定船舶总长、型宽、满载吃水、吨级等主要参数,研判提出渤海湾30个客滚泊位的大型化船型并开展适用性评价。对引导渤海湾新建省际客滚船标准化、序列化发展,强化船舶适港、适航安全保障性具有技术支撑作用。

基于VOF方法的规则波下破舱进水数值模拟

文中以某理想客滚船舱段模型为研究对象,基于VOF方法建立两相流体积模型,采用重叠网格和交界面网格技术,分析规则波下不同破口形状舱室模型破舱进水下的运动响应.结果表明:不同破口形状对破舱进水过程的影响主要表现为横摇时域的高频成分,且不同破口形状导致的流量不同.

基于GA-BP神经网络的客船人员疏散时间预测模型的建立

针对客船人员疏散问题,设置了影响疏散时间的多个参数,构建了3×3×3×5×6=810种不同的疏散场景,利用Pathfinder人员疏散仿真软件获得了810组人员疏散时间的模拟数据,并在此基础上建立两种不同的预测模型:一种基于BP神经网络,另一种则结合了遗传算法的GA-BP神经网络,对其进行实验性能对比。结果表明,优化后的神经网络预测准确率达到97.7622%,相较于优化前提高了2.5394%。采用遗传算法对神经网络进行优化,训练时间有所减少,准确性大大提高,可为船舶应急处理提供科学依据和新的技术手段。

旅游观光客船电力二次系统设计

旅游观光客船作为一种提供海上或河流旅行体验的交通工具,其电力系统的设计和管理对确保乘客安全、提高能效以及增强乘船舒适度体验至关重要。电力二次系统作为电力系统的重要组成部分,负责对电力二次设备的控制、保护、监测及调节,确保电力供应的稳定性和可靠性。文章从旅游观光客船的电力需求出发,详细探讨电力二次系统的设计原则、系统架构、实现方法及能效管理策略,旨在为旅游观光客船提供一个高效、可靠且易于维护的电力二次系统解决方案,并通过系统测试验证设计的有效性和实用性。

中俄界河高速客船安全监管实践

中俄界河高速客船承担着中俄两岸国际旅客运输的重要职能。2023年,黑龙江省水路口岸恢复开通后,此类船舶的运营及发展面临新的挑战。通过监管实践,对发现的问题开展对策研究,提出针对性建议,致力于提升船舶营运和安全管理水平。

多种送风末端布置在客船餐厅的设计

文章针对客船上通风末端的形式和安装位置影响其舒适性和艺术效果的问题,通过采用多种送风末端相结合的设计方案,实现了船舶空调通风系统和周围环境协调统一,为新建改造客船设计提供参考。

“客船围蔽处所内的乘客舱室通道布置不合规”案例分析及建议

客船安全检查历来是船舶监管的重点,客船舱室中乘员具有相对集中、人员密度大的特点,客舱的通道布置关系到紧急情况下乘客撤离逃生有效性,若通道不能直接、便捷的引导旅客向开敞甲板和救生设备所在位置方向疏散,将严重影响危急情况下乘客的逃生机率,造成伤亡事故发生。海事部门在客船集中安检中发现一处涉及客船围蔽处所内的乘客舱室通道布置不满足法规要求的缺陷,具有典型特点和分析意义。

客船安全返港系统设计及检验方案

为提高客船安全返港(Safe Return to Port,SRTP)系统的可靠性和安全性,确保船员和旅客的生命财产安全,对客船安全返港系统的设计要求和核查方法进行分析,并通过案例对设计和核查方法的有效性进行验证。研究表明:基于SRTP要求的客船安全返港系统设计和核查方法具有实用性和可行性,能够有效提升客船安全返港系统的设计可靠性和安全性。研究成果可为SRTP系统设计及检验提供一定参考。

中日航线客滚船总体设计特点

192客位客滚船是由中国船企自主研发、设计、建造的第一型中日航线客滚船,集“安全、环保、减排、防控与智能”于一身。从船舶主尺度和主要参数的选取、分舱与破损稳性的研究、乘客空间和滚装处所的设计特点、能效水平的提升、防控设施的考虑等方面,对中日航线客滚船与国内客滚船不同的总体设计特点进行了详细的介绍,为后续相似船型的总体设计和优化提供参考。

Assessing Safety of Ferry Routes by Ship Handling Model through AHP and Fuzzy Approach

Ferry accidents often occur the result of ship handling difficulty which interfacing human, machine and environment. Therefore, a decision tool model as a comprehensive information system, based on the ship handling difficulty, needs to be developed through the combination of Analytic Hierarchy Process (AHP) and Fuzzy Logic System. The Fuzzy Logic System part consists of ship condition, ship handling facility condition, navigation condition and weather condition. The output of decision tool is the ship handling difficulty level in linguistic form. The simulation of model is conducted at several straits in Indonesia water. The decision tool model could be used as management information system by port authority to monitor the ferry/ship movement in real time regarding the ship handling difficulty. Further, it would be used to take some useful safety operation strategies and safety policies to improve ferry transportation safety at port water and strait water.

Problems Associated with Evacuation from the Ship in Case of an Emergency Situation

The problems associated with evacuation of people from the ship in an emergency situation are analyzed, especially passenger ships are taken under consideration. The most dangerous accidents requiring evacuation are described. Marine accidents often occur as eliminating all of the hazards to human health and life is still impossible. In every case, the evacuation process from the ship must be taken under consideration. Evacuation route arrangement should provide the possibility of safe departure from danger areas for passengers and crew members. Evacuation routes designed for human interaction within the evacuation process and other important factors are reviewed. Additionally, the method for seeking evacuation time as a function of initial distribution of passengers and evacuation routes choosing is suggested. A genetic algorithm will be used, whilst the calculated evacuation time is connected with a fitness function. Parameters Of evacuation routes topology are coded as non-binary chromosomes. Genetic operators are fitted for such types of problems to avoid receiving infeasible solutions. The objective of the proposed method is to find the evacuation time in worse case scenarios.

琼州海峡客滚船运输水域船舶交叉碰撞事故概率研究

文中采用ArcGIS绘制了2023年1月19日琼州海峡水域的船舶AIS轨迹图,分析该水域交通流结构和特征参数.利用Arena构建新海港至徐闻港船舶交叉碰撞仿真模型,经仿真得到06:00—07:00时段、13:00—14:00时段和22:00—23:00时段客滚船与穿越船舶发生碰撞概率较高.

基于Vortex的客滚船拉锚仿真分析

针对拉锚试验仿真提出一种分析方法。以某客滚船为研究对象,基于变质量运动学理论,利用SolidWorks和Vortex软件开发、创建一种实时有效的锚系动态仿真方法,并与现场拉锚场景进行比对,以验证该方法的可行性和可靠性,为锚系仿真提供有效参考,并为取代木模试验提供条件。

客船人员疏散仿真模型的验证方法

文中探讨了两类可对仿真模型进行验证的疏散场景,分别为疏散分析指南中的12个测试场景(Test 1~Test 12),和实船疏散试验项目SAFEGUARD中的两个实船场景(SGVDS1和SGVDS2).利用软件Pathfinder对各场景进行仿真,并说明完整的验证过程.

豪华客滚船全频段舱室噪声预报及降噪设计

豪华客滚船对于整体性能和舒适性要求较高,但由于船体结构复杂、舱室数量众多、多重噪声激励下,存在噪声预报准确性不足,降噪设计难度大的问题。本文提出一种基于统计能量法(SEA)、有限元-统计能量法(FE-SEA),有限元法(EFEA)的豪华客滚船全频段噪声预报方法,并结合贡献量分析开展舱室降噪设计。首先,基于统计能量法建立高频声振耦合模型,计算各板子系统模态密度,进行频段划分,进而建立有限元-统计能量分析模型和有限元模型;其次,通过设置损耗因子、耦合损耗因子,确定螺旋桨振动噪声,主机和电机辐射噪声、振动噪声及空调通风噪声等主要噪声源,进行全频段声学分析。最后,根据《船上噪声等级规则》MSC.337(91)噪声标准规范,提出相应降噪方案,并进行贡献量分析。结果表明,该研究成功对船舶舱室进行全频段声学预测,经降噪处理后,舱室噪声值满足规范值要求。

整体和局部载荷下双体客船整船立柱结构强度分析

客船因其结构的特殊性,拥有数量庞大的立柱,且存在上下非对齐立柱,目前规范中没有针对客船立柱的强度评估指南。以一双体客船的整船立柱为研究对象,利用有限元方法,开展整船载荷下和局部载荷下的立柱强度计算,充分对比两种计算下立柱的屈服和屈曲强度。结果表明:对于双体客船,影响立柱结构强度的主导因素是局部载荷,非对齐立柱会导致横梁和纵桁应力集中,设计中需重点关注。