亲历动车组首航

一夜之间,未来变得可以触摸,我们在火车飞驰过程中享受餐车酒吧式的服务,感受接近飞机一样的平稳运行…… 在电视新闻镜头中,乘坐首日开行新型列车的乘客似乎都难掩激动,他们像孩子一样开心地演示那些能够随意调节的靠背、可以180°旋转的新式座椅,并且兴奋地举着手中的车票向记者展示。[编者按]     

小半径曲线防磨护轨有限元分析及改进设计

根据小半径曲线防磨护轨的结构特点，采用三维块单元建立有限元分析模型，并对原始设计进行分析计算，结果为应力集中较大。在对应力及变形分析基础上提出了结构的改进设计方案。通过有限元分析计算表明，改进后的设计方案应力分布趋于均匀，并有可靠的机械强度。     

推进“绿色工程”力促液气密技术进步

当前倡导的"绿色工程"无论内涵还是外延,都体现了系统工程的概念,不仅包括绿色采购、绿色设计、绿色生产、绿色制造、绿色消费及相关技术标准,而且更主要的是体现在落实科学发展观,企业转变生产方式,调整产品结构,推进企业技术进步,促进行业自主创新体系建设的总体要求上。液压气动密封行业是高技术密集的行业,在节能、环保、安全、降耗、减排中起着重要作用,也是推进"绿色工程"比较容易见效的行业。同时,液压气动密封产品又是标准化、模块化和通用化产品,非常适应绿色设计的需要,加之液压气动密封技术融合了多学科的技术,广泛吸收各学科的新成果,包括新工艺、新材料,易于形成具有自身特色的新技术、新产品,并且便于较快推广。因此,在液压气动密封行业中大力推进"绿色工程",对促进行业技术进步,具有重大现实意义。     

Dynamics of high speed wheel/rail system and its modelling

With the fast increasing of train speed the interactions among the train,the track,and the power cate-nary system become very strong. Such interactions are also strongly coupled with the action of high speed airflow due to the high speed running. Hence,the existing research methods and numerical al-gorithms of railway vehicle/track systems are not fully available for characterizing the transient dy-namic and long-term behaviors of train/track at higher speed. The present paper reviews the existing studies on coupling dynamics of railway vehicle/track,and clarifies their advantages and disadvan-tages and then puts forward an innovation stratagem for high speed railway based on rolling contact of wheel/rail systems. In the innovation stratagem,a comprehensive dynamic model of wheels/rails sys-tems is developed to simultaneously consider the track system,the train,the rolling contact of wheel/rail,the catenary/pantograph system,and the high speed airflow with the train. The motion equations of the subsystems and their coupling boundaries are given and discussed. For the reliability and safety of the high speed train in service,the long-term behavior of the structures of the train and the track is considered in the comprehensive model. Moreover,a generalized failure model,consider-ing the structures and the materials and working in the comprehensive dynamic model of wheels/rails system,as well as the simulation system of structure failure of the high speed train/track is established. Consequently,the present studies on the dynamics of the coupled vehicle/track will be further and largely extended.