水平偏转线圈绕制模具复杂型面检测及加工标准的建立与实施

本文采用复杂型面数字仿真分析技术和光滑曲面拟合技术相结合,对水平偏转线圈绕制模的成形面进行了研究,结果表明模具成形面可通过对特定回转面沿对称轴两侧进行对称微量修整而得到,由此建立了绕制模复杂型面的检测及加工标准和实施方法,并开发了相应的智能加工(检测)系统。     

Development of a live-line partial-discharge detection method for XLPE-insulated copper wire-shielded cable using a “yoke coil”

This paper describes a new partial-discharge detection method for an XLPE-insulated copper wire-shielded cable line using a “yoke coil.” Partial discharges are measured with the yoke coil which detects the azimuthal component of the current flowing through the copper wires wound on an outer semiconducting layer with a given angle against the axial direction of the cable. The highest detection sensitivity of 2 pC has been achieved at a frequency range of 5 to 20 MHz using a 77-kV 100-mm² model cable line (200 m in length). It was confirmed that the partial discharge caused by an artificial defect has successfully been detected using the proposed method. In the PD measurement for an actual 77-kV XLPE-insulated live line, the detection sensitivity was 10 pC.     

CS54E—2—AV型彩色电视接收机场扫描电路设计

本文提出场扫描电路一种新的供电方式,即用一组低压电源完成场扫描电路正程低压供电和逆程高压供电。     

应用防错技术实现质量零缺陷

介绍了防错技术的定义和起源，举例说明了防错技术的分类和特征，并分析了防错技术的作用应用范围；提出潜在失效模式分析、数据库知识管理以及防错分析三种方法是防错实施的重点。以此为基础提出防错技术在零缺陷质量目标下的七步实施模式。     

THE DETERMINATION OF THE FLELD PARAMETERS OF SADDLE DEFLECTION YOKE WITH A FERROMAGNETIC SHIELD

The analysis and computation of the field distribution of the saddle deflection coil with aferromagnetic shield by the boundary element method are described,and the limitations of the modelproposed by D.M.Fye(1979)is pointed out.The Green's function is expanded by the Maclaurin series,andthe analytical forms of the field parameters B_0,B_2,and B_4 are given.The results obtained agree well with theexperimentally measured values.     

A classifier learning system using a coevolution method for deflection yoke misconvergence pattern classification problem

Deflection yoke (DY) is one of the core components of a cathode ray tube (CRT) in a computer monitor or a television that determines the image quality. Once a DY anomaly is found from beam patterns on a display in the production line of CRTs, the remedy process should be performed through three steps: identifying misconvergence types from the anomalous display pattern, adjusting manufacturing process parameters, and fine tuning. This study focuses on discovering a classifier for the identification of DY misconvergence patterns by applying a coevolutionary classification method. The DY misconvergence classification problems may be decomposed into two subproblems, which are feature selection and classifier adaptation. A coevolutionary classification method is designed by coordinating the two subproblems, whose performances are affected by each other. The proposed method establishes a group of partial sub-regions, defined by regional feature set, and then fits a finite number of classifiers to the data pattern by using a genetic algorithm in every sub-region. A cycle of the cooperation loop is completed by evolving the sub-regions based on the evaluation results of the fitted classifiers located in the corresponding sub-regions. The classifier system has been tested with real-field data acquired from the production line of a computer monitor manufacturer in Korea, showing superior performance to other methods such as k-nearest neighbors, decision trees, and neural networks.     

论摆动磁场式Π形电磁轭磁场和提升力

推导了一恒定磁场与一正弦交变磁场合成为摆动磁场的数学关系式,设计出摆动磁场式Π形电磁轭,一次磁化即可实现全方位探伤。该磁化装置的提升力与其在工件中产生的合成磁场无对应关系,因此不能反映对工件的磁化能力。     

塔架式单点系泊系统中软钢臂结构强度和疲劳分析

阐述从系泊时域分析结果中筛选极端工况软钢臂结构设计载荷的方法,采用考虑惯性释放的有限元算法计算结构应力的过程,并推荐结构强度和稳定性校核的接受衡准。根据疲劳载荷长期分布,采用有限元方法计算相关各疲劳载荷对应的疲劳应力因子,进而求得所有位置疲劳应力的长期分布,采用确定性疲劳分析方法计算疲劳寿命。     

结构参数对筒形磁力联轴器磁转矩的影响

在假设磁转子的气隙远小于其轴向尺寸的情况下可忽略其边端效应,将磁力联轴器的磁场求解简化为二维平面磁场。借助ANSYS软件对磁力联轴器的磁场分布进行数值模拟,得到了不同磁转角下的磁力线分布和磁感应强度分布,并计算出对应的磁转矩,分析了内外磁体厚度、内外轭铁厚度、气隙及磁极数目对磁转矩的影响,以期对磁力联轴器的设计和应用提供有益参考。     

高强钢摩擦焊接头感应加热区宽度窄化技术

针对高强钢摩擦焊接头焊后正火感应热处理加热区过宽产生的焊接接头软化失效问题，为窄化感应加热区宽度作了磁轭式感应器；采用红外热成像技术实时检测高强钢钻杆摩擦焊头焊后正火感应热处理过程的温度分布，评定了该感应器窄化感应加热区的效果。