Dry sliding wear behavior of silver containing Ni-based composite-steel tribo-pair

Ni-based self lubricating composites containing four different amounts of silver were prepared by powder metallurgy (PM) route. The room temperature friction and wear behavior was investigated by carrying out dry sliding experiments against bearing steel using a ring-on-disk configuration. Tests were conducted at a constant load of 100N and different sliding speeds of 0.5, 1.0 and 1.5 m/s to analyze the effect of both the speed and the silver content on the wear behavior of the tribo-pair. The friction coefficient and the wear rate of the composites were found to decrease with increasing both the sliding speed and the silver content. The wear rate of the counterface was observed to be a little higher when it was siding against the composite having silver in comparison to that without any silver. However, the overall wear rate of the tribo-pair was found to decrease with increasing sliding speed and silver content.     

Research on magnetomechanical coupling effect of Q235 steel member specimens

In this study, magnetomechanical coupling tests were performed on Q235 solid round steel model specimens in NIM-200HF magnetomechanical coupling equipment. Hysteresis loops were obtained in different magnetic fields and stresses. Magnetization curves were also achieved at different stresses. Influence of the applied stresses on the hysteresis loops was investigated. The stress sensitive region and linear stress sensitive region of magnetic induction were determined for the model specimen according to the experimental data. The dependence relation of magnetic induction versus applied stresses was established, and the optimum magnetic field was determined in the stress sensitive range of magnetic induction, which builds a basis for nondestructive testing (NDT) of stress with the total magnetic flux for steel structure. Based on modified Jiles-Atherton??s model of magnetic hysteresis, the hysteresis loop for Q235 steel 4-mm diameter model specimen was numerically simulated, which was well consistent with the experimental results.     

机场货运监控系统关键技术研究

介绍了机场货运监控系统的结构和功能,深入研究了机场货运监控系统的多任务控制和实时通信两个关键技术．其中多任务控制技术是指采用多线程技术并行处理多个任务;实时通信技术主要包括采用异步委托技术实现上位机调度和下位机通信的分离和采用OPC（OLE for Process Control用于过程控制的OLE）标准接口技术实现多PLC的实时通讯的技术．概述了该技术在某大型机场实际应用情况．     

质子交换膜燃料电池流场模拟与结构尺寸优化

为了获得较优的流道深度、流道宽度和流道岸的宽度,采用计算流体动力学软件Fluent的PEM模块进行数值模拟和优化设计.研究表明,直流道流场的深度为0.4 mm时,电池性能最好,流道岸的宽度不要超过流道宽度,较优的流道宽度和流道岸的宽度比值为1:1和2:1.     

提速铁路60kg/m轨30号道岔施工工艺——上海南站-春申复线P6030号道岔的铺设

该文介绍了60kg/m轨30号道岔技术特性,详细总结了提速线路铺设P6030号道岔的施工工艺及注意事项。     

十字万向节凸度滚针摆动疲劳寿命对比试验

针对相交圆弧修形滚针、对数轮廓滚针及不同凸度量的对数凸型滚针,进行了摆动工况条件下滚针轴承的疲劳寿命试验研究.试验结果表明,对数轮廓滚针的润滑状态和承载能力明显好于相交圆弧修形滚针;凸度量不足会导致边缘效应,但凸度量过大同样会降低承载能力,即某确定工况下凸度量存在最优值;对于凸度量相同的一组滚针,高速轻载工况下的承载能力明显好于低速重载工况,这与高速轻载工况下的润滑状态较好有关.     

高速公路软土地基固结沉降计算方法比较

根据江苏沿江高速公路常熟段软基处理实测资料,用指数曲线法、Asaoka法和双曲线法,推算了软粘土地基沉降。通过比较,说明这些方法对分析使用水泥土搅拌桩复合地基处理的软粘土地基实测资料的适宜性和它们各自的优缺点。     

风积砂地区树根桩单桩承载力现场试验研究

研究了不同成桩材料及成桩过程对单桩承载力的影响。试验结果表明,先填石子后压力注浆所成的树根桩单桩承载力最高;风积砂地区,当桩长超过4．5m后,再增加桩长,并不能提高单桩承载力,而增大桩径是一种有效途径。     

柴油机混合动力控制器硬件在环仿真系统设计

通过对客车柴油机混合动力控制系统的分析,设计开发了柴油机混合动力控制器(HCU)的硬件在环仿真系统,详细介绍了系统方案和混合动力仿真模型的建立,通过Matlab/Simulink,Matlab/Stateflow,C语言和汇编语言混合编程的方法,研制了HCU硬件在环仿真的软件系统;基于V850E MCU研制了仿真控制器HILECU,研制了HCU硬件在环仿真的硬件系统,最后以单轴并联混合动力系统为对象,进行了混合动力控制器HCU硬件在环仿真试验研究。     

岩沥青复合改性沥青SMA性能试验研究与应用

为了进一步改善普通改性沥青的性能,以满足桥面铺装使用性能的要求,对岩沥青复合改性沥青及SMA混合料的性能进行高温稳定性、疲劳性能等试验分析。试验结果表明,岩沥青复合改性沥青SMA能够大幅度提高混合料的高温抗车辙和疲劳性能,满足桥面铺装使用条件要求,并在实体工程中得到推广应用。