1000kV特高压交流输电线路设计中的电磁环境问题

针对途径山东境内第一条特高压交流线路,重点讨论特高压架空输电线路设计中的电磁环境问题,同时给出电磁环境要求下的线路走廊宽度及邻近或跨越房屋时的对地距离,可为设计和运行单位提供参考。     

Increasing Plant Availability by Mechanical Checking of the Cement Rotary Kiln Axis

A periodic check of the cement rotary kiln axis is needed within the framework of preventive maintenance for maintaining high plant availability. The fourth generation " KAS - 4 ' measuring system ivas developed by Wuhan University of Technology in 1999. The system can be carried out with rotating or stationary kiln plant. The same is true of the measurement of tire and supporting roller diameters, the clearance of tires , the position of rollers, the machining of tires and rollers , the slopes of roller surfaces, the deflection of gear, the axis of kiln . The system has been applied to the measurement for 10 sets of cement rotary kiln in China .     

Comparison of urea clearance in low‐efficiency low‐flux vs. high‐efficiency high‐flux dialyzer membrane with reduced blood and dialysate flow: An in vitro analysis

Rapid removal of small molecules during hemodialysis places an acutely ill patient with kidney failure at an increased risk of hemodynamic instability and for dialysis disequilibrium syndrome. The use of high‐flux, high‐efficiency (HEF) dialyzers may increase this risk despite reductions in blood and dialysate flow. We performed in vitro experiments to compare urea clearance at low dialysate flow and various blood flows using a low‐efficiency low‐flux (LEF) and a HEF membrane. Compared to LEF, there was a significant increase in the clearance of urea at all blood flows with the HEF (all P values < 0.005). HEF dialyzer (F180NR) had higher urea clearance at a blood flow of 150 mL/min than LEF dialyzer (F5) at blood flow of 300 mL/min (144.1 ± 0.99 vs. 130.1 ± 0.001 mL/min for F180 vs. F5, respectively, P < 0.002). Our data suggest that use of HEF dialyzer are not as safe as LEF in high‐risk acute dialysis patients since these are associated with more rapid removal of urea despite reduction in blood and dialysate flow as compared to LEF.     

基于摆度规律与CAD相结合的导瓦间隙分配算法研究及应用

导瓦间隙分配是水轮发电机组安装检修过程中一项十分重要的工作,合适的瓦间隙是机组健康运行的重要保障.针对瓦间隙计算存在的操作难度大、计算速度慢、精准度低等问题,建立了立式水轮发电机组盘车摆度模型,分析了其摆度特性,推导了实际最大净全摆度计算公式.通过分析瓦间隙计算公式的几何意义,提出了一种结合AutoCAD快速标注的瓦间...     

多自由度含间隙振动系统周期运动的二重Hopf分岔

基于Poincaré映射方法和数值仿真分析了多自由度含间隙振动系统对称型周期碰撞运动的稳定性与二重Hopf分岔。应用映射的中心流形和范式方法,研究了高维映射在其Jacobian矩阵两对复共轭特征值同时穿越复平面单位圆周情况下的余维二分岔,分析了映射在二重Hopf分岔点附近的双参数开折,揭示了含间隙振动系统在二重Hopf分岔点附近的动力学行为。含间隙振动系统在二重Hopf分岔点附近存在对称型周期碰撞运动、对称型周期碰撞运动的Hopf分岔、环面分岔及“轮胎”型概周期吸引子。环面分岔导致了半吸引不变环和复杂的“轮胎”型概周期吸引子。     

32C制动器底板的工艺分析及模具设计

分析了32C制动器底板的成形工艺和模具设计,并对消除侧向力的工艺方法进行了探讨.介绍了模具间隙的选取及模具结构的合理设计.     

齿轮联轴器的应用与故障分析

齿轮联轴器在实际使用中连接两轴水平度、同轴度误差太大,使其转动时受到附加力作用,导致联轴器产生较大振动,损坏电机和减速器轴承,降低设备使用寿命,在安装时必须保证安装精度提高使用寿命。     

小间隙电解加工工艺探讨

简要阐明了小间隙电解加工的主要工艺及注意事项.     

1000MW机组汽轮机碰缸工艺

详细介绍和阐述了上海上电漕泾1 000MW机组在汽轮机动静间隙检查过程中,对高、中、低压缸进行碰缸检修的方法,以及调整动静间隙的工艺,为同类型机组汽轮机组碰缸检修提供参考。     

500kV同塔双回输电线路电磁环境的影响因素分析

介绍我国工频电磁场环境的相关规定及工频电场强度、工频磁场强度的计算公式,通过分析相序排列和对地距离等因素对500 kV同塔双回输电线路电磁环境影响的规律,得到对电磁环境影响最小的相序排列和满足环保要求的最小对地距离.