集装箱正面吊运机吊具摇摆控制系统的仿真分析

根据集装箱正面吊运机吊具平衡系统的工作特点和运动学要求,搭建其机械和液压模型,利用AMESim动态仿真软件对吊具装卸作业的运动过程进行仿真比较,优化系统相关参数,从而得到最佳方案。     

FPSO全生命周期风险管理

简述了FPSO风险管理的目的和意义，结合FPSO风险特点和FPSO管理经验，采用风险分析方法指出FPSO全生命周期面临的安全风险；针对FPSO全生命周期内的设计、建造、生产、废弃等不同阶段的不同风险探索相应的风险管理方法和控制措施，旨在有效降低FPSO全生命周期内的健康安全环保风险。     

Time-variant ultimate longitudinal strength of corroded bulk carriers

Many bulk carrier losses have been reported of late, and one of the possible causes of such casualties is thought to be the structural failure of aging hulls in rough weather. In aging ships, corrosion and fatigue cracks are the two most important factors affecting structural safety and integrity. This paper uses a set of the time-dependent corrosion wastage models for 23 different member locations/categories of bulk carriers previously developed by the authors, based on the available corrosion measurements for existing large bulk carrier structures. Differences due to the location and corrosion severity of every member type are taken into account. The nominal design corrosion values for the primary members are suggested based on the annualized corrosion rates obtained in the present study. The effect of time-variant corrosion wastage on the ultimate hull girder strength as well as the section moduli is studied. The criteria for repair and maintenance of heavily corroded structural members so as to keep the ultimate longitudinal strength at an acceptable level are discussed. Important insights and conclusions developed are summarized.     

烃类化合物在SE—54和OV—1固定相上焓变关系

研究了烃类化合物在ＯＶ－１和ＳＥ－５４固定相间的焓变关系，该研究结果为设计烃类化合物在相同温度程序下的双柱谱图自动识别程序提供了科学依据。     

微机及载波控制逆变CO_2焊机的应用前景

通过对载波控制技术在焊机上的应用的研究,集成微机控制技术、IGBT逆变焊机节能技术,研发新型高效节能的微机及载波控制逆变CO2焊机,其效率比传统的硅整流CO2焊机提高30%以上;比传统的IGBT逆变CO2焊机节电10%,效率达到95%.因此,它为耗能巨大的电焊作业提供了节能降耗重要途径.可见这种技术先进、功能强大、人机界面友好、性价比甚高的微机及载波控制的逆变CO2焊机必将成为船舶高效焊接重要的工艺装备.     

桥面物理除冰雪加热功率与环境因素关系分析

为解决化学融雪剂腐蚀桥梁结构和污染环境的问题，提出桥面敷设加热电缆方式除冰雪技术方案，以30m预应力混凝土T梁桥、沥青混凝土桥面为分析对象，进行了瞬态热分析和稳态热分析，系统研究了在桥面加热升温和稳态融雪节段加热功率与环境温度和环境风速的关系。经分析可知桥面加热过程可分为滞后、升温和稳态三个阶段，得出了一些有意义的结论，可为桥面敷设加热电缆除冰雪设计提供理论参考。     

缸内压力原始测量信号的处理方法

文章介绍了对缸内采集的原始压力信号的一般处理方法,并比较了不同光顺次数对压力数据的影响,提出了分段光顺的方法。结果表明,通过多循环平均和分段光顺对压力数据进行处理,高压段和低压段均能得到比较光滑的压力曲线,又使处理后的数据与原始测量数据的误差较小。     

Phase change analysis of an underwater glider propelled by the ocean＇s thermal energy

The phase change characteristic of the power source of an underwater glider propelled by the ocean＇s thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process, but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees, the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change, and the slope of the temperature time history curve remains the same. However, the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size, boundary conditions, and the power source＇s cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38ram needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.     

大口径特涂管高质量制造的生产工艺

在72 000 dwt成品油船货油管制造中,发生特涂管涂装层脱落的问题,本文就此进行了分析,并提出了解决措施。