电炉用矩形母线排的短路校验

通过对平行和竖立布置的矩形母线排发生短路现象的分析,分别利用简化算式计算了短路时通过母线的冲击电流和母线间产生的电动力;根据矩形母线的不同布置形式,校验了影响母线稳定性的绝缘子跨距及所受的最大允许应力,指出了三相母线短路时中间相受力最大,三相母线在同一平面竖立布置比平行布置受力大12.5倍。经过实践证明该算法安全经济,对设计同功率机械工厂热加工车间电炉用矩形母线线路具有较好的借鉴作用。

大型储罐液压顶升倒装法关键部位强度校验方法

本文主要介绍在大型储罐采用液压顶升倒装法的施工中,需要制作顶升用工装夹具,涨圈、门型卡板、吊耳板。为了满足罐体提升过程中各工装夹具强度受力要求,对这些夹具部件进行了受力强度校验。最终满足倒装法的施工要求。

聚酯工艺蒸汽冷凝器设计及校验

阐述了列管式冷凝器设计、应力校核,此计算、校验方法实用、可靠,具有推广意义。

IMS凸度仪高压电缆的维护方法

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Experimental Confirmation on the Calibration Curves for Preston＇s Method

The Preston＇s method is considered as one of the most commonly employed methods to measure the wall shear stress. However, it is only possible to determine the wall shear stress from measured pressure differences of the Preston tube and undisturbed static pressure, combined with calibration curves, which depend on the Preston tube diameter, fluid density, and viscosity. Since its invention, no significant advancement in theory has been made, and calibration curves proposed by Preston, Patel and Bechert are still in use. In the present study, a need to measure surface shear stress over a circular cylinder prompted us to develop our original Preston tube system. The developed system has been calibrated by measuring the wall shear stress in the fully developed turbulent flow regime in a circular pipe. The present results generally confirm the previously reported calibration curves. A slight modification of the coefficients in the calibration equation shows further improvement.