燃料电池控制系统自动代码生成

针对自行开发的软硬件平台,结合控制算法的Simulink模型设计了代码自动生成的方法,实现了基于Motorola PowerPC555单片机的电子控制单元和OSEK Turbo实时操作系统的燃料电池控制系统开发过程中的快速迭代,最终实现了快速控制原型开发。该控制系统经过10kW燃料电池发动机实验,取得了良好的控制效果。     

Optimal ballast water exchange sequence design using symmetrical multitank strategy

The quality of the ballast water exchange scheme affects many aspects of a ship, including intact stability, structural strength, building and operational expenses, etc. This paper focuses on developing an optimization methodology for large-scale sequential ballast water exchange. The method of transversely symmetrical ballast water tanks being exchanged simultaneously is adopted, and the potentials of multiple tanks being exchanged at a time are explored. The mathematical model for the symmetrical ballast water exchange problem is built by minimizing the occurred maximum trims, maximum hull girder bending moments, and shearing forces as objectives, and the related safety assessment criteria as constraints. A multiobjective genetic algorithm with some operators specially designed for the problem is presented to obtain a set of approximate Pareto-optimal solutions for engineers to choose from. Finally, a real case study on the symmetrical ballast water exchange of a 176,000 DWT bulk carrier is conducted to illustrate the effectiveness of the proposed approach.     

一种新型船舶压载水管理系统的设计

本文设计一套压载水管理系统,该系统能方便地进行液位遥测和阀门遥控,友好地实现对船舶压载水的监测和管理。论文介绍了计算机工作站的结构和基于Usual Basic的软件功能．     

风机系统改进及应用

风机系统应用于加压舱的空调系统,其功能为：船用加压舱进行正常工作过程中,利用风机系统对空调系统所产生的冷、热量与舱内空气进行有效交换,从而发挥空调系统应有的功能。本文主要介绍了某船加压舱空调系统中的风机系统的改进及应用。     

电力推进船舶负载管理技术研究

本文针对电力推进船舶的特点,分析了负载管理的必要性,界定了负载管理的基本功能,然后从信息交互的角度设计了负载管理的控制结构,并提出了一种基于规则的负载管理算法,该算法能实现动态优先级设定、重载起动询问、功率限制和快速卸载等功能,最后验证了其有效性。     

三维完全非线性波浪水槽的数值模拟

用有限元求解拉普拉斯方程,采用满足完全非线性自由表面条件的半拉格朗日法追踪流体自由表面,离散单元采用20节点的六面体二次等参数单元,建立了三维完全非线性数值波浪水槽.把数值计算结果与水面初始升高产生箱体内流体运动解析解和二阶斯托克波理论解进行了对比,结果表明该模型是稳定的、守恒的,能精确模拟非线性波浪的产生和传播,为今后研究非线性波浪对船舶等非规则物体的作用提供了参考.     

基于CPCI总线的GMSK调制系统研究

介绍一种基于CPCI总线的GMSK调制系统,采用了DSP结合CPLD的方式构建的系统平台,对系统的结构和功能及硬件,软件设计进行了详细的介绍,并对主要器件的一些特点做了简单的描述。     

船用锅炉主过热蒸汽管路破损的贝叶斯网络安全性定量分析

针对贝叶斯网络方法在处理大规模复杂系统上的优点,结合当前船用锅炉的安全性定量分析特点,提出将贝叶斯网络方法应用于船用锅炉的安全性分析。通过探讨贝叶斯网络及故障树分析方法原理,尝试将贝叶斯网络与故障树分析方法结合起来,主要突出贝叶斯网络方法可以实现数据的自动更新及由后验信息到先验信息的反向推理能力。最后将该方法应用于船用锅炉的安全性定量分析中,通过更新观测部件故障状态实现了整个系统的自动更新,并自动查找出最大概率事件,证实该方法提高了安全性分析效率,使实际操作更加准确、快捷,极大地的降低了事故带来的风险。     

高职院校装备制造类专业校企资源深度融合的探索

本论文从人才培养、技术创新、就业创业、社会服务、文化传承五个方面阐述了校企资源深度融合的标准和内容,旨在推进产教融合,校企合作,工学结合,知行合一的高职办学理念,积极探索校企资源深度融合的新途径,对于开展现代职业教育模式具有一定的借鉴意义.     

Heat Release Rate and Temperature Field of a Bus on Fire北大核心CSCD

Bus fires are a common source of fires that occur in tunnels and are a huge threat to the safety of the tunnel structure and related personnel. An elaborate numerical simulation model of a bus is established considering the different combustion characteristics of the bus body, seats, decorations and baggage. For fires occuring at the bus head, middle part or back seat, the temperature field, heat release rate (HRR) and characteristics of the fire are ana-lyzed. The HRR calculation formula is obtained by superimposing a Boltzmann curve on a Gaussian curve. The re-sults show the peak and average values of a bus HRR are 48 MW and 8.1 MW, respectively, and the released energy due to combustion is 14.5 GJ; the maximum burning temperature reaches 1 040℃ and the temperature near the door can reach 60℃ after 120 sec. The temperature rises fastest at the bus door when the fire occurs at the rear of the bus and it has a high chance of detonating the fuel tank. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.