铁路货车的油漆涂料

随着货车制造业的复苏,车辆的涂装在北美市场重新引起了重视,文章简要介绍了美国有关公司生产的环保型涂料及今后涂料的研究和发展方向。     

创新的曲轴零件试验方法

曲轴是现代内燃机最重要的零件之一,它在运转中承受着复杂的机械负荷,曲轴轴颈的过渡圆角、润滑主轴颈和连杆轴颈的机油钻孔出口都是易引起振动断裂的危险部位。因此在制造过程中,对这些部位采取了成本较高的表面强化措施。为了能在尽可能接近实际负荷状况的运转强度试验中检验这些强化措施的效果,IABG公司已开发出一种新的曲轴试验方法。     

燃油发动机用阀门材料（二）

本文回顾了阀门钢的发展历史，介绍了各类阀门材料的性能特点，重点介绍了Ｃｒ－Ｍｎ－Ｎ钢，另外还论述了空心阀门技术，分析了阀门密封面上的残余压力。介绍了轻合金材料在阀门上的应用。由于文章篇幅技术，本刊分两次连载，本期刊登该文的第二部分，续上期。     

巴塞罗那地铁9号线

新建的47公里长地铁9号线是西班牙巴塞罗那地铁系统最大的扩建项目。本论述了采用直径12米两种不同盾构的最初结果。另外．提出了测量和控制程序。同时解释了地下研究活动。[编按]     

Integral Recrystallization Modelling

1.IntroductionAlthoughmancanproducemetallicmaterialssincemorethan5(X)0yearsitisafundamentalfindingofonlythiscenturythatthePropertiesofamaterialarenotdeterminedbyanymacroscopicquantity,likeoverallcomposition,dimensions,strainortemperature,ratherthanbyitsmicrostructure,i.e.thespatialdistributionofelements,phases,orientationsanddefects.Thismicrosmicture,however,isliabletOchangeduringprocessingofamaterialfromtheliquidstatetothefinalproduct,anditcanbesubstantiallyaffectedbychangingtheprocessingcon…     

施特伦格隧道：在高挤压岩层中挖掘隧道

隧道施工人员在施工中很少会一帆风顺。本论述了在施特伦格隧道施工中．如何采用适当的措施解决在高挤压岩层中施工时所遇到的最严重的问题。[编按]     

Dynamics of five-bar COBOT using differential mechanism

COBOT is a new kind of collaborative robot, which can work with people in a shared space. In this paper a new kind of CVT using differential mechanism is introduced, which is major parts of five-bar COBOT and based the feature of nonhlonnmie constraint. The dynamic model of differential mechanism and five-bar architecture COBOT is founded. There are two kinds of coupled mode of two CVT:serial and parallel. In this paper, we present the dynamic model of serial and parallel COBOT take five-bar COBOT as research object. From the dynamic analysis foregoing, both serial and parallel COBOT model are have the feature of nonholonomic constraint. The ending track and moving state are controlled by the force of control motor and operator. The control motor can not control the movement and ending track of COBOT witbout the cooperation of cperator.     

采用连续系统建模的轮对动力学和稳定性理论分析

介绍采用连续系统建模的轮对动力学和稳定性理论分析法，轨道简易模型，车轮的物理和数学模型，并对滚动接触非弹性效应进行了仿真。