立式水轮发电机组检修中轴线找正的探讨

围绕立式水轮发电机组在检修中对轴线的测量、数据分析和发电机轴线、综合轴线找正进行了探讨，阐述了在调整过程中应该注意的问题，同时以葛洲坝电站机组为例，分析了电站机组在检修中轴线找正的方法。     

高炉煤气管道剩余壁厚检测装置研究

基于电磁激励式漏磁原理设计出一种新型检测装置,详细介绍检测原理、检测装置结构及参数确定。该装置周向均布有32组检测单元,确保了管道径向无漏检;采用由螺母丝杠副带动的变径机构,使之在Φ400~600 mm范围内的管道中均能可靠工作,大大提高了检测装置的作业环境适应性;柔性结构的设计为装置的过弯检测及弯管通过性提供了技术上的保障。该设计不但能够满足冶金企业高炉煤气管道剩余壁厚检测的需要,而且也可以应用于其他生产领域的金属管道无损检测中。     

高温旋风分离分级效率的理论计算及其分析

旋风分离器是高温除尘技术中优先考虑的预除尘设备。以平衡尘粒模型以及相似理论原理分析为基础,给出了该分离器高温旋风分离的分级效率的计算方法,对反映其在高温状态下分离特性的参数分割粒径dc50和分布指数m进行了分析。以Stairmand高效旋风分离器为例,分级效率的理论计算结果与高温旋风分离的试验值进行了比较对照。     

Analytic Model of Reactive Flow

A simple analytic model allows prediction of rate constants and size effect behavior before a hydrocode run, if size effect data exist. It utilizes detonation velocity, average detonation rate, pressure and energy at infinite radius. This allows the derivation of a generalized radius, which becomes larger as the explosive becomes more non‐ideal. The model is applied to near‐ideal PBX 9404, in‐between ANFO and most non‐ideal AN. The power of the pressure declines from 2.3, and 1.5 to 0.8 across this set. The power of the burn fraction, F, is 0.8, 0 and 0, so that an F‐term is important only for the ideal explosives. The size effect shapes change from concave‐down to nearly straight to concave‐up. Failure is associated with ideal explosives when the calculated detonation velocity turns in a double‐valued way. The effect of the power of the pressure may be simulated by including a pressure cut‐off in the detonation rate. The model allows comparison of a wide spectrum of explosives providing that a single detonation rate is feasible.     

A study on fuel spray of spark-ignited direct injection engine using laser image technology

One of the important research for developing a spark-ignited direct injection engine is optimization of the fuel spray distribution and air flow field in the cylinder. Therefore, spray pattern and mean fuel droplet size of swirl injector were investigated using Laser Light Sheet Photography and PDPA' respectively. And, for the formation of stratified mixture with adequate strength near a spark plug at injection mode in compression stroke, spray distribution after impingement on flat piston or bowl piston in a transparent motoring engine was visualized for the three different injector positions. KIA Motors Corp.     

智能化光栅数显表在大直径测量中的应用

光栅数显表是一种用于精密测量直线位移的数字化仪表。本文介绍了一种利用单片机为核心设计的通用型光栅数显表的绝对零位系统进行大直径测量的新方法。可对各类大型车床的加工件进行动态测量,并直观地显示其直径。     

SSPD传感器在光电精密测径系统中的应用

介绍了应用ＳＳＰＤ传感器实现光电精密测径的系统工作原理以及系统各部分结构。     

Improved Circularity Metrology of Small Cylindrical Workpieces by the Segmenting-stitching Technique

To address the alignment and measuring force problem in the segmenting-stitching technique for the circularity metrology of small cylindrical workpieces (diameter less than 1.5 mm and length less than 10 mm), a magnet combination jig method is proposed. A small round magnet is attached between the round magnetic jig and small cylinder, and the other end of the small cylindrical workpiece is attached to some cylindrical magnets. Thus, the smaller cylinder can be put in the V-groove and measured successfully with the magnet combination. For ver-ifying the advantage of the magnet combination jig, four measurement quality evaluations are proposed: the circumferential deviation of neighbor arc contours, radial deviation of neighbor arc contours, angle of inclina-tion between the V-groove and small cylinder, and curvature of the obtained arc. The results show that the matching coefficient is enhanced by 98%, the Euclidean distance of overlap parts of neighbor arc contours is reduced by 68%, the position error is reduced 27%, and the average curvature of the arc contours is improved. It can be concluded that the measuring quality can be enhanced prominently by this magnet combination method for the segmenting-stitching method.