船用组合式玻璃钢电缆托架由导轨、横档、支撑结构及各部分之间的连接件组成,导轨和横档采用玻璃钢材质,结合船用环境提出2种托架设计方案.通过实验测试玻璃钢材料在不同温度、湿度下各个方向上的力学性能,合理确定安全载荷.应用COMSOL专用有限元结构力学计算软件,校核各种工况下玻璃钢电缆托架的整体应力,保证电缆托架结构强度.玻璃钢电缆托架具有耐腐蚀性强、电磁绝缘性优良等特点,实现了高载荷、轻量化的设计目标.
采用有限元法对压载装载工况和满载装载工况下的50 000 DWT散货船首制船的机舱及上层建筑等区域的振动和响应特性进行预报分析,计算得到两种不同装载工况下的船体固有频率及其振型以及在螺旋桨脉动压力和主机激振力作用下的局部强迫振动响应值.计算分析表明,在两种典型的装载工况下,50 000 DWT散货船通过结构局部结构加强后振动性能良好,满足ISO 6954:2000的衡准要求.根据实船试航振动实测数据,预报分析结果与实测数据比较吻合,验证了预报分析的可靠性和必要性.
2023年4月6日,锦江航运(集团)股份有限公司与上海船舶研究设计院举行了智能化船舶建设项目签约仪式.上海船舶研究设计院全资子公司上海斯达瑞船舶海洋工程服务有限公司将为锦江航运2艘在建及10艘在营运的节能型集装箱船完成智能系统加装.锦江航运总经理陈燕、副总经理赵小兵,上海船舶研究设计院院长吕智勇、副院长李路等出席仪式.
基于CCS船级社规范,概述68 000 DWT多用途船的结构布置特点.B1冰级的多用途船相对常规航线的船舶主机功率更大、转速更高,并且上建布置特殊,振动问题凸显.基于全船尾部三维模型和一维船体梁的混合模型进行振动预报,H型力矩补偿器的使用极大的改善了振动结果,为后续同类型船舶提供参考.
At present,the measurement carried out by Unmanned Aerial Vehicle（UAV） with sensors has become a research hotspot at home and abroad. However,UAVs can not locate and fly autonomously in closed spaces such as cabins or vertical oil tanks,because they can not receive the GNSS signal there. Therefore,a method for autonomous flight image data acquisition in closed spaces of multi rotor UAVs based on real-world three-dimensional models was proposed. The rough real scene three-dimensional model of the cabin was established through the panoramic pan tilt camera. On this basis,the three-dimensional route and measurement points of the UAV were designed,and the flight of the UAV was controlled by the flight control software to achieve accurate positioning and collect indoor image data,which had been successfully applied to the actual cabin capacity measurement.
Appling SO x scrubber is one of the approved performance technologies to reduce sulfur emission from ships.Working conditions of entry port and departure from port will play a big part in the whole voyage for small-sized container vessels. More attention should be paid to the selection of SO x scrubber and its arrangement due to the limit space in the funnel of small-sized container vessels. In the meantime,as the engine power is much smaller compared with that of the large-sized container vessels,it is necessary to discuss whether SO x scrubber or MGO is more economical. Based on the application of SO x scrubber to the 600 FEU reefer container vessel,through comparing different scrubber systems in the market,it is found that the hybrid system is useable in all water area and more suitable for small-sized container vessels. The solutions to coping with the difficulties while applying SO x scrubber were introduced,including funnel arrange,gas pipe connection with scrubber and relevant tanks. By economic analysis measures,the primary investment payback time based on difference between the price of high and low sulfur oil is 50 $/t,100 $/t and 200 $/t was calculated,showing that while difference in price is more than 200 $/t,the payback period is attractive.
The total capacity of the power station of a vessel has great influence on the method of power distribution.The middle voltage power distribution could be used in large capacity power station,but the cost is high and it is not convenient for maintenance. Adopting the low voltage distribution could save the cost of construction and maintenance,but it also has requirement for the breaking capacity of protection devices. In order to broaden the choices of design methods for large capacity power station,a refrigerated container vessel was taken as an example,the conventional design ideas were brokens,and the three sections for AC 440 V power system through working conditions of power station were studied. By simulating the calculation of short-circuit current and comparing with common two bus bar power distribution system,the reliable and economical scheme as the researched results of AC440 V bus bars being divided 3 subsections applied for 9.8 MW power station was obtained,serving as a design method for the reference of low voltage power system.
The ship shore link and shutdown systems has been researched and developed to meet the requirement of different vessels. For oil/chemical tankers,the emergency shutdown system mainly consists of the devices such as the control box of ship shore emergency shutdown system,the control box of ship shore link system,the deck socket box（with 5-pin plug）,the cut-off push button,the visual and audible alarm device and etc. For LNG-powered ships,the emergency shutdown system mainly consists of the devices such as the control box of ship shore shutdown system,the control box of ship shore link system（including fiber optical,electric and pneumatic function）,the deck socket box（with the plug of fiber optical,electric and pneumatic）,the cut-off push button,the visual and audible alarm device,the switch of cutting-off and converting over oil and chemical/LNG and etc. The systems can release visual and audible alarm device automatically and also provide the manually cut-off push button. Besides,the system integrates with the mature ship shore communication system. The designed ship shore link and shutdown systems can meet the standards of OCIMF,SIGTTO and ISO,and IMO regulation and the requirement of relevant classification societies as well. The product has been applied and installed on the first ship of seven 7 999 DWT bunkering tanker.
The key point of electric design of the 3 600 CEU LNG battery hybrid powered PCTC is the electrical system,including the power plant configuration,distribution system design,the application and layout of the power battery. Based on the power load under various working conditions and power battery’s electrical characteristics,the application of hybrid power system,including main generator,shaft generator and power battery,was optimized under different conditions. This vessel is featured with advanced integrated management and control system,more humanized bridge layout design solution and highly improved automation and management level,which might serve as reference for developing similar vessel with hybrid power system.
In order to use the data generated in the process and results of ship R＆D,design and management in a unified manner,and protect and use the core digital assets of the design more effectively,a virtual simulation application platform for ship private cloud design was developed based on the hyper converged underlying architecture and virtualization technology. By integrating the computing,storage and network of several physical nodes into a large resource pool,I/O performance and resource utilization were improved with the characteristics of high availability and easy expansion. The platform could flexibly allocate resources and improve ship R＆D and design quality and office arrangement efficiency according to the needs of the integration of optimized simulation and collaborative design for ship R＆D and design.
The US-Mexico rail car carrier is designed for regularly shuttling between Mobile port in the southern America and Coatzacoalcos port in Mexico. Based on the characteristics of its route and ports,the equipment configuration and design of the vessel has certain particularities. Several characteristics were selected and analyzed from the perspective of electrical design. As no combined boiler was provided,part of tankers and equipment of the ship still needed to be heated,and high power electric heaters should be provided,so the power consumption of electric heaters should be considered when the capacity of main power station was determined. Because of the dangerous goods carried on the train,the ro-ro area was considered as hazardous area. The mooring area adjacent to ro-ro area was also taken as hazardous area,which had a great impact on the arrangement of electric mooring equipment.
The 7 500 m~3 LNG bunker consists of double bottom,double side skin,and single trunk deck structure,and accommodated two independent type C cargo tanks,which can meet LNG transportation demands and provide refueling services for other ships or onshore terminals. The key technique points of structural design, such as arrangement of cargo hold structure,the connection between type C cargo tank and hull,the rigidity of single trunk deck structure and the structural characteristics of bulkhead were presented. The feasibility of the structural design was verified by temperature distribution calculation,FE strength analysis and vibration and noise assessment,and the calculation results met the requirements of the rules.
近日, 中国船舶集团上海船舶研究设计院船舶设计二部党总支部、生产设计部党支部与招商局金陵船舶(威海)有限公司第二党支部开展支部共建活动,凝聚三方合力,共促业务发展,着力打造"—体化"设计示范项目,推进鉴真号客滚船项目设计和建造顺利进行.
The electric propulsion power calculation,electric load calculation,power grid architecture design and safe return to port（SRtP） design are the key technologies to be overcome in the development and design of cruise integrated electric propulsion. The electric propulsion system is an important load of cruise ship. The power demand at different speeds was calculated by the naval constant method,and the power of the cruise ship propulsion system was determined by analyzing and comparing the proportion of propulsion power of different cruise ships. The cruise load book according to the cruise load grouping and working condition division was calculated and analyzed,and the power and configuration of the power station was determined. Through the comparison between feeder type and ring type integrated power grid,the power grid architecture design was carried out. Combined with the design requirements of SRtP,the system configuration and equipment layout were analyzed to form a SRtP design scheme. Through the research on the key technologies of the integrated electric propulsion system of the target ship type,a set of typical design schemes was formed to provide reference for the development design of cruise ships.
Based on the foreign experimental data,the thermodynamic properties of density,phase equilibrium,and enthalpy were calculated and compared through PR-BM,BWRS,BWR-LS,RKS-BM,and PSRK equations under large pressure and temperature range conditions. The results showed that the BWR-LS equation had the highest density prediction accuracy under low pressure conditions,while the PR-BM equation was the best under high pressure conditions. For the phase envelop calculation,LKP equation had the highest precision when the mole fraction of heavy hydrocarbon was high,conversely,PR equation was the best. Besides,enthalpy calculation through the PR-BM equation was in good agreement with the experimental data. This work is useful for the equation of state selection for the thermodynamic properties calculation of natural gas.
For pursuing greater economic benefits, the engine room and the fore peak tank space are usually compressed in bulk carriers,which leads to ships’ trim by stern under homogeneous full loading conditions. In order to improve the afloat condition without adjusting the subdivision of the compartments,the mathematical model derivation was carried out. The result showed that the orientation of cargo hold stools had a certain effect on the afloat condition. The orientation of cargo hold stools towards the stern could increase ships’ trim by stem under the condition of full load of homogeneous light cargo,while the orientation of cargo hold stools towards the stem could increase ships ’ trim by stem under the condition of full load of homogeneous heavy cargo. The validity of the conclusion was verified by an example of some handy-max bulk carrier.
Special maintenance vessels are equipped with different professional maintenance facilities and comprehensive support equipment, and can provide replenishment support at sea. According to the different requirements of marine maintenance tasks,specific application scenarios and ship damage condition,different modes of marine maintenance can be adopted. Typical solutions include installing maintenance support modules on civil merchant ships or engineering ships,professional transformation of existing merchant ships or engineering ships,and building new dedicated marine maintenance ships. Marine maintenance ships provide unplanned maintenance services for ships in peacetime to extend the duration of the ship’s mission,while repair the damage hull and equipment in time to maximize the ship’s survivability in wartime or emergency.
In order to ensure the navigation safety of ships,it is necessary to accurately forecast the rocking motion caused by the environmental factors such as wind,wave and current. Therefore,the use of radial basis function（RBF）neural network was studied to make real-time prediction of the movement attitude of ships in the next few seconds to ten seconds for the benefits of the avoidance of risks and accurate control of ships during navigation. The results showed that compared with the classical BP（Back Propagation） neural network,the RBF neural network model adopted had better performance in terms of forecasting time length and error,and could be effectively used to accurately predict the ship rocking motion.
Driven by electricity with zero emission,the Changxing-Hengsha Island ultra-capacitor ro-ro ferry is built for carrying passengers,cars and trucks transportation. There is thruster room,engine room and super-capacitor room under main deck,while vehicle room,passenger room and wheel house are above main deck. Longitudinal framing is adopted for main deck and bottom shell,and the rule length is less than 80 m,therefore longitudinal strength analysis is not necessary according to the rules. But because of bigger breadth depth ratio（B/D）than normal vessel,sharp and narrow fore bottom lines and the truss arrangement in capacitor room not satisfying rules,longitudinal bending strength and buckling strength are still checked according to the rules. Mid-body FEM calculation with superstructure is also implemented to assess primary member buckling strength,making the structure more reasonable and safe.
Designed by SDARI,the dead weight capacity 8 800 DWT multi-purpose vessel is a new generation one with large box-shape cargo hold,suitable for carrying packaged cargo,general cargo,large engineering parts and bulk cargo,such as coal,ore and etc. as well as containers loaded on hatch cover. Dangerous goods of category 1-9 according to IMDG Code can also be loaded. The ship is featured with compact layout,multi functions and excellent performance. The design of ship lines,cargo hold form,subdivisions,layout of engine room and main deck outfitting machines,as well as the new rules of the intact stability and damage stability applicable for the ship is focused on to introduce the main characteristics of general design of the ship.
