为消除船上不同应用系统之间的数据交互隔阂,设计一种基于国际标准化组织(International Organization for Standardization,ISO)标准的船舶数据交互与共享系统解决方案。分析船舶数据采集和应用的现状,结合ISO标准对船舶计算机数据交...为消除船上不同应用系统之间的数据交互隔阂,设计一种基于国际标准化组织(International Organization for Standardization,ISO)标准的船舶数据交互与共享系统解决方案。分析船舶数据采集和应用的现状,结合ISO标准对船舶计算机数据交互的最新要求,阐述系统设计的基本原理及其应具备的基本功能。从通信、存储、处理和安全等角度设计系统硬件架构,分析各组成设备的功能、网络连接和配置方式。根据软件功能架构、功能模块和数据流,基于工厂设计模式思想设计系统的核心功能,最终形成软硬件相结合的系统设计方案,为船舶数字化技术的发展提供参考。展开更多
To analyse a possible way to improve the propulsion performance of ships,the unstructured grid and the Reynolds Average Navier-Stokes equations were used to calculate the performance of a propeller and rudder fitted w...To analyse a possible way to improve the propulsion performance of ships,the unstructured grid and the Reynolds Average Navier-Stokes equations were used to calculate the performance of a propeller and rudder fitted with additional thrust fins in the viscous flow field.The computational fluid dynamics software FLUENT was used to simulate the thrust and torque coefficient as a function of the advance coefficient of propeller and the thrust efficiency of additional thrust fins. The pressure and velocity flow behind the propeller was calculated. The geometrical nodes of the propeller were constituted by FORTRAN program and the NUMBS method was used to create a configuration of the propeller,which was then used by GAMMBIT to generate the calculation model. The thrust efficiency of fins was calculated as a function of the number of additional fins and the attack angles. The results of the calculations agree fairly well with experimental data,which shows that the viscous flow solution we present is useful in simulating the performance of propellers and rudders with additional fins.展开更多
Methods used for digital ship design were studied and formed the basis of a proposed frame model suitable for ship construction modeling. Based on 3-D modeling software, a digital design system for hull structures was...Methods used for digital ship design were studied and formed the basis of a proposed frame model suitable for ship construction modeling. Based on 3-D modeling software, a digital design system for hull structures was developed. Basic software systems for modeling, modifying, and assembly simulation were developed. The system has good compatibility, and models created by it can be saved in different 3-D file formats, and 2D engineering drawings can be output directly. The model can be modified dynamically, overcoming the necessity of repeated modifications during hull structural design. Through operations such as model construction, intervention inspection, and collision detection, problems can be identified and modified during the hull structural design stage. Technologies for centralized control of the system, database management, and 3-D digital design are integrated into this digital model in the preliminary design stage of shipbuilding.展开更多
The max collision force of ship-bridge collision is one of the most importantreferences for bridge design. By mean linear digital simulation method, the collision forces ofthe collisions between rigid bridge pier and ...The max collision force of ship-bridge collision is one of the most importantreferences for bridge design. By mean linear digital simulation method, the collision forces ofthe collisions between rigid bridge pier and ship bow were calculated out for four different ships,whose tonnages are 5 000,10 000,50 000 and 60 000 DWT respectively. Curves of collisionforce-penetration and absorbed energy-penetration are obtained, and the data of the max loads arethen summarized. On the basis of these curves and data, a set of curves describing therelationships between max collision forces and tonnages of the ships are successfully presented, bywhich the max collision forces of the ships-bridge with different tonnages and in differentvelocities can be estimated easily and reliably.展开更多
文摘为消除船上不同应用系统之间的数据交互隔阂,设计一种基于国际标准化组织(International Organization for Standardization,ISO)标准的船舶数据交互与共享系统解决方案。分析船舶数据采集和应用的现状,结合ISO标准对船舶计算机数据交互的最新要求,阐述系统设计的基本原理及其应具备的基本功能。从通信、存储、处理和安全等角度设计系统硬件架构,分析各组成设备的功能、网络连接和配置方式。根据软件功能架构、功能模块和数据流,基于工厂设计模式思想设计系统的核心功能,最终形成软硬件相结合的系统设计方案,为船舶数字化技术的发展提供参考。
文摘To analyse a possible way to improve the propulsion performance of ships,the unstructured grid and the Reynolds Average Navier-Stokes equations were used to calculate the performance of a propeller and rudder fitted with additional thrust fins in the viscous flow field.The computational fluid dynamics software FLUENT was used to simulate the thrust and torque coefficient as a function of the advance coefficient of propeller and the thrust efficiency of additional thrust fins. The pressure and velocity flow behind the propeller was calculated. The geometrical nodes of the propeller were constituted by FORTRAN program and the NUMBS method was used to create a configuration of the propeller,which was then used by GAMMBIT to generate the calculation model. The thrust efficiency of fins was calculated as a function of the number of additional fins and the attack angles. The results of the calculations agree fairly well with experimental data,which shows that the viscous flow solution we present is useful in simulating the performance of propellers and rudders with additional fins.
文摘Methods used for digital ship design were studied and formed the basis of a proposed frame model suitable for ship construction modeling. Based on 3-D modeling software, a digital design system for hull structures was developed. Basic software systems for modeling, modifying, and assembly simulation were developed. The system has good compatibility, and models created by it can be saved in different 3-D file formats, and 2D engineering drawings can be output directly. The model can be modified dynamically, overcoming the necessity of repeated modifications during hull structural design. Through operations such as model construction, intervention inspection, and collision detection, problems can be identified and modified during the hull structural design stage. Technologies for centralized control of the system, database management, and 3-D digital design are integrated into this digital model in the preliminary design stage of shipbuilding.
文摘The max collision force of ship-bridge collision is one of the most importantreferences for bridge design. By mean linear digital simulation method, the collision forces ofthe collisions between rigid bridge pier and ship bow were calculated out for four different ships,whose tonnages are 5 000,10 000,50 000 and 60 000 DWT respectively. Curves of collisionforce-penetration and absorbed energy-penetration are obtained, and the data of the max loads arethen summarized. On the basis of these curves and data, a set of curves describing therelationships between max collision forces and tonnages of the ships are successfully presented, bywhich the max collision forces of the ships-bridge with different tonnages and in differentvelocities can be estimated easily and reliably.
