梭车转向系及差速实现方法探讨

通过对梭车行走独立驱动方式及转向系的分析研究,建立了轮胎偏转角与转向半径之间的数学模型,并利用机电一体化技术,对梭车转向差速的实现方法进行了探讨,并在实践中得到应用。     

柳工ZL50C装载机总成装配与调试的方法介绍

总成装配与调试是工程机械维修中的一个难点,装配工艺要求高,不允许有任何失误,为提高维修质量和效率,经反复实践研究,总结出柳工ZL50C型装载机的总成装配与调试方法,旨在为同行提供借鉴作用。     

燃油税改革对我国汽车业的影响

燃油税的开征是国家节能战略的一项重大举措,燃油税的实施影响到整个汽车产业环节。本文通过经济学的基本理论和有关数据首先分析了燃油税改革对消费者选车及用车时的利益影响;进一步分析了燃油税改革在汽车消费结构转变、节约燃油及推动新能源汽车开发等方面的重要作用。     

液压控制系统在竖井操车中的应用

在立井罐笼提升操车系统中,利用集中液压系统及PLC自动化控制,改变现有的混杂控制方式,消除存在的安全隐患,实现更好的矿车装罐、卸罐、定位、调运等功能,为立井提升的可靠、经济运行提供保障。     

车载顶驱空气钻机在煤田地质勘探中的应用探讨

介绍了矿区和钻孔基本情况、施工工艺和流程,对车载顶驱空气钻机和煤田地质勘探常规钻机轮换施工工艺在煤田地质勘探巨厚覆盖层(角砾岩)中的应用和利弊分析进行了分析,提出结论和推广建议。     

矿用斜井人车所能通过的最小曲率半径的研究

矿用窄轨矿车和平巷人车可以看成是斜井人车的一种演变,其曲率半径的取值方法同斜井人车的曲率半径取值方法基本上是一致的,所以斜井人车所能通过的曲率半径的取值方法的研究有着重要的意义,对人车和窄轨矿车的设计、检测检验、研发也有着深远的影响。     

太阳能电动车动力传动系参数匹配的基础研究

总结并分析了太阳能电动车动力传动系布置方案.给出了动力传动系参数的匹配方法,并对相关参数的选择进行了分析.同时根据车辆功率跟随策略制定了动力传动系的控制策略,绘制了控制流程图.模拟实车试制了太阳能电动小车,根据试验测试结果,证明了理论研究的正确性,同时说明太阳能作为汽车能源是可行的.     

Hygrothermal effects on properties of highly conductive epoxy/graphite composites for applications as bipolar plates

The hygrothermal effects on mechanical, thermal, and electrical properties of highly conductive graphite-based epoxy composites were investigated. The highly conductive graphite-based epoxy composites were found to be suitable for applications as bipolar plates in proton exchange membrane (PEM) fuel cells. The hygrothermal aging experiments were designed to simulate the service conditions in PEM fuel cells. Specifically, the composite specimens were immersed in boiling water, aqueous sulphuric acid solution, and aqueous solution of hydrogen peroxide. The water uptake, changes in surface appearance and dimensions, glass transition behavior and thermal stability, and electrical and mechanical properties were evaluated. The water uptake at short time increased linearly with the square root of time as in linear Fickian diffusion. The presence of graphite significantly reduced both the rate and extent of water uptake. No discernible changes in specimen dimensions, surface appearance, and morphology of the composites were observed. The electrical conductivity and mechanical properties remained almost unchanged. The wet specimens showed slight reduction of glass transition temperature (T_g) due to plasticization of epoxy networks by absorbed water, while the re-dried specimens showed small increase of T_g. The composites maintained high electrical conductivity of about 300–500 S cm⁻¹ and good mechanical properties and showed thermal stability up to 350 °C.     

CFD simulation on performance of new type umbrella plate scrubber

A new type of umbrella plate scrubber was developed to address the pollution due to the dust, dioxide sulfur and other harmful gases, which were emitted from coal-burning boilers. The performance of the new device was studied through computational fluid dynamics（CFD） simulation and experiment methods. Initial work included experimental measurement of inlet-velocity, and gas phase simulation using Reynolds stress model（RSM）. After gas phase was converged, particles were injected from the inlet of the new device. Discrete phase model（DPM） was used for particle trajectories determination. The pressure drop and the collection efficiency of the new device were predicted through simulation. The simulation results show that the pressure drop of the new devices is 230-250 Pa and the efficiency is 84%-86%, with the inlet velocity equal to 10.6 m/s and the dust concentration ranging from 2 to 22 g/m3. The CFD simulation results of the new device show good agreement with experimental data. The relative error of the pressure drop and the efficiency is approximately 4% and 10% respectively. The results obtained both from the numerical simulation and from the experiment demonstrate that CFD simulation is an effective method for this type of study.     

质子交换膜燃料电池用铝合金双极板研究

以铝合金为基体材料的双极板,用电脑雕刻方法制作流场,采用碱性-酸性双镀液体系化学镀镍磷合金镀层.研究了热处理对镍磷合金镀层的表面形貌和耐腐蚀性的影响.结果表明,铝合金双极板经过化学镀镍磷合金后,可以满足质子交换膜燃料电池的性能要求.