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PLC在货车轴承清洗机中的应用 总被引:2,自引:0,他引:2
设计了一种新型铁路货车轴承清洗机的清洗工艺过程,开发实施了清洗机的控制系统。着重阐述了用PLC对其运行过程进行自动检测的应用情况,并结合实际设备分析了PLC控制系统的硬件构成和软件特点。现场实际应用的结果表明,设备具有清洗效果良好、自动化程度高、运行稳定可靠等特点。 相似文献
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张允中 《世界航空航天博览》2005,(2):81-84
20世纪80年代,在苏联辽阔的西伯利亚原野上,经常出现一些绿色的神秘列车,这些列车只有6-8节车厢组成,列车中周的一些车厢像是没有窗口的铁路保温车,然而却比铁路保温车要长大得多,接近了旅客客车车厢的长度,从外形上看,这些车厢采用的是货车的转向架,甚至是采用4轴转向架,可见里面运送的是重量很在的东西。 相似文献
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Hypersonic glide vehicles (HGVs) are launched by a solid booster and glide through the atmosphere at high speeds. HGVs will be important means for rapid long-range delivery in the future. Given that the glide is unpowered, the initial glide conditions (IGCs) are crucial for flight. This paper aims to find the optimal IGCs to improve the maneuverability and decrease the con- straints of HGVs. By considering the IGCs as experiment factors, we design an orthogonal table with three factors that have five levels each by using the orthogonal experimental design method. Thereafter, we apply the Gauss pseudospectral method to perform glide trajectory optimization by using each test of the orthogonal table as the initial condition. Based on the analytic hierarchy process, an integrated indicator is established to evaluate the IGCs, which synthesizes the indexes of the maneuverability and constraints. The integrated indicator is calculated from the trajectory opti- mization results. Finally, optimal IGCs and valuable conclusions are obtained by using range anal- ysis, variance analysis, and regression analysis on the integrated indicator. 相似文献
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随着人们能买得起的新一代汽车天线的出现,卫星电视将可以从屋内的起居室移到行驶途中的货车、旅游车和家庭轿车内观看。 相似文献