直接还原铁的海上安全运输探讨

通过对一起海上运输直接还原铁发生爆炸事件的分析研究,从直接还原铁的种类和特性入手,找出了发生事故的主要原因,并根据有关规则研究直接还原铁海上安全运输的对策,以便给今后的相关人员以理论上的支持。     

复杂悬跨条件下的管线涡激振动分析(英文)

Spans occur when a pipeline is laid on a rough undulating seabed or when upheaval buckling occurs due to constrained thermal expansion. This not only results in static and dynamic loads on the flowline at span sections, but also generates vortex induced vibration (VIV), which can lead to fatigue issues. The phenomenon, if not predicted and controlled properly, will negatively affect pipeline integrity, leading to expensive remediation and intervention work. Span analysis can be complicated by: long span lengths, a large number of spans caused by a rough seabed, and multi-span interactions. In addition, the complexity can be more onerous and challenging when soil uncertainty, concrete degradation and unknown residual lay tension are considered in the analysis. This paper describes the latest developments and a .state-of-the-art. finite element analysis program that has been developed to simulate the span response of a flowline under complex boundary and loading conditions. Both VIV and direct wave loading are captured in the analysis and the results are sequentially used for the ultimate limit state (ULS) check and fatigue life calculation.     

环形线行车安全综合监测系统的研究与应用

针对环形线货车120 km/h可靠性试验的行车安全问题,提出了基于BC/S模式的行车安全综合监测系统.该系统具有扩展性强、易维护和系统资源利用充分等优点,使得现场人员能够实时监控车辆运转信息,并且为试验的安全运行发挥了重要作用.     

Determination of the transportable moisture limit of iron ore fines for the prevention of liquefaction in bulk carriers

In 2013, over 500 million metric tons of Iron Ore Fines (IOF) were transported around the world using bulk carriers. Under certain conditions IOF, while being transported, can possibly undergo liquefaction. Since 2006, there has been eight reported bulk carrier casualties possibly caused by the liquefaction of IOF. The objective of this study is to evaluate, compare and verify the limitations and relevance of the Proctor/Fagerberg, Flow Table and Penetration test methods that are used to determine the Transportable Moisture Limit (TML) of IOF. The TML is the maximum gross water content that bulk cargoes, including IOF, may contain while being transported at sea without being at risk of liquefying. A thorough literature review, along with laboratory research, was carried out to compare the TML results from the three leading test methods to determine whether they produce reliable results when testing IOF. The study concludes that the three test methods, as stated in the 2012 International Maritime Solid Bulk Cargoes Code, are unverified and therefore not appropriate for testing IOF. This is due to the variation in the results produced by the three test methods and also due to the difference in the physical properties of IOF when compared with the materials that were originally intended for testing. It is noted that the TML alone may not control the potential liquefaction of IOF and further studies, regarding the physical properties and system variables, which cause the material to liquefy, are required to determine the liquefaction potential of IOF.     

Study on the application of spectral fatigue analysis

1Introduction Fatiguefailurehaslongbeenanimportantissuefor shipsandoffshorestructures.Toensuresufficientfa tiguestrengthduringtheservicelife,afatiguestrength assessmentneedstobedoneatthedesignstage.Gen erally,methodsforassessingfatiguestrengthcanbe classi…     

基于BC3199测试系统的集成电路测试研究

BC3199测试系统是一款模拟数字混合信号测试系统,本文以BC3199测试系统作为集成电路测试平台,将科研生产中常用的集成电路作为测试对象,从实测的角度阐述集成电路的测试方法。     

基于DEA的辽宁省建筑业产能效率分析

运用改进的主成分分析法和经验法结合确定评价指标体系,应用DEAP 2.1软件对辽宁建筑业产能效率进行Multi-stage和Malmquist分析,选取BC2产出角度模型,从省域和省内两个方向对比分析结果,得出结论：辽宁省建筑业整体产能效率目前位于全国前列,但技术水平的发挥仍然存在问题;丹东、锦州、辽阳和盘锦在辽宁省内建筑业产能效率偏低.同时提出简要建议,希望能为辽宁省建筑业更快发展献言献策.