静止型动态无功补偿装置的应用

高压静止型动态无功补偿装置(SVC)可提高功率因数,使供电系统的电压稳定,既提高了设备的运行可靠性,又减少了设备维护和运行成本,具有良好的技术经济效益。     

稀土高铬镍多元合金高温耐磨钢在氧化铝气态悬浮焙烧炉上的试用

通过稀土高铬镍多元合金高温耐磨钢在氧化铝气态悬浮焙烧炉CO1、CO2冷却旋风中心筒上的应用试验．表明该材料具有高耐磨性．高热强性．高抗氧化性的优点．是目前氧化铝气态焙烧炉CO1、CO2冷却旋风中心筒较为理想的使用材料。用其取代现用的不锈钢材质．可以有效提高CO1、CO2冷却旋风中心筒的使用寿命．降低检修费用．减少职工劳动强度。     

成形磨齿最佳齿根过渡曲线

针对根切与不根切两种情况，提出了成形加工齿轮最佳根过渡曲线的确定方法。     

弧齿锥齿轮 V/H 检验的数学描述

对弧齿锥齿轮Ｖ／Ｈ检验的理论进行了深入的研究。用齿轮参数和加工时的机床调整参数建立了Ｖ／Ｈ检验的数学模型，并进行了实例计算与实验验证。     

Parallel power paths and compactness of gear transmissions

Developments in mechanical power transmission have hinged around better materials and processes, new design ideas and effective new application of enduring scientific design principles and ideas. The current presentation aims at showing how deliberate measures to optimize load distribution have increased the compactness and capabilities of present day gear transmissions. Exploitation of parallel power paths, packing of gears in annular spaces and the effective use of epicyclic action by reducing the number of gear meshes and substituting rolling friction are explained. Deceased     

Near surface stress analysis strategies for axisymmetric fretting

Fretting is essentially a surface phenomenon, but bulk stresses and material properties contribute to subsequent failure. This feature of fretting demands a thorough understanding of near surface stresses under the joint action of normal, shear and thermal loading. Axisymmetric fretting is of great concern in piping and coupling design. In this paper, we develop design tools for Near Surface Analysis (NSA) for understanding axisymmetric fretting. Axisymmetric Fretting Analysis (AFA) becomes formidable owing to localised tractions that call for Fourier transform techniques. We develop two different NSA strategies based on two-dimensional plane strain models: 2D strip model (2DS) and half-plane Flamant model (2DF). We compare the results of 2DS and 2DF with the exact results for AFA obtained using Love’s stress function in conjunction with Fourier transform. There is a good correspondence between stress components obtained from 2D-models.     

血液透析系统用泵

介绍了血液透析系统所用泵的特点、结构和性能 ,建议国内研究单位或厂家研究开发此类泵及配套的电机 ,以满足国内医疗系统的要求     

应用圆柱螺线法计算邻井最近距离点的新算法

在邻井井段曲线类型为圆柱螺线时,通过数学变换,将邻井间最近距离点的约束方程转化为一个形式更简单的约束方程;使用二分法,得到了一个计算量最小且收敛性好的新的迭代算法。新算法可应用于钻井轨道设计、井眼轨迹监控等实际问题中。     

煅石膏粉空气冷却机介绍——内展翅片管空气冷却机

目前中国煅石膏粉生产使用的冷却机冷却效率低，设备体积大。介绍了一种新型高效、冷却速度快、设备体积小、使用寿命长的内展翅片管空气冷却机。当风量6000m^3／h、物料停留时间8min、冷空气温度25℃时，生产能力达到45t／h，煅石膏温度从180℃降至79℃。较好解决了2种热交换介质因导热系数不同而导致的热交换不平衡和设备体积庞大、消耗钢材偏高的问题，从而有效地提高了换热器的换热效果，降低了设备的制造成本。     

Operation of T-250/300-240 turbines without working blades in the last stages of the low-pressure cylinder

The current operating regimes for turbines of this type and their possible long-term uses affect the choice of a rational option for the modernization of the low-pressure cylinder (using a three stage rotor with reduced lengths of the working blades in the last stage or removal of working blades in the last stages), which should be made taking into account the specific conditions at each given heating and electric power plant. Studies of T-250/300-240 turbines at the heating and electric power plant TéTs-23 of JSC “Mosénergo” operating without working blades in the last stages of the low-pressure cylinder are described. These demonstrate increased efficiency during both summer and winter operation under the conditions at this plant. The condition of the trailing edges of the working blades in stages 30 and 39 is found to be excellent, but erosion of the steam inlet deflector cone in the region of the feedthrough for the low-pressure cylinder along the direction of the twist in the flow is observed. It is proposed that an alignment module be installed at the outlet of the low-pressure cylinder for protection from overload, the compressor effect, and root eddies. For further increases in efficiency it is proposed to examine the feasibility of raising the maximum allowable temperature of the exhaust at the low-pressure cylinder of the modernized turbine. __________ Translated from élektricheskie Stantsii, No. 11, November 2007, pp. 84–90.