分析仪器的故障诊断与处理

介绍了常用分析仪器,在日常使用过程中常见的故障种类,故障原因判断与分析,故障的预防,以及故障检查与排除方法。     

使用农用电动机须安装熔断器

电动机在运行中，可能因绕阻绝缘烧坏而接地，或因其接线端相碰而造成短路。为了保护电源并迅速排除短路故障，必须在电动机电路中安装熔断器。熔丝的额定电流值可是电动机额定电流的2．5—3倍，这样，电动机超支时熔丝不易被烧断，而在电路内发生短路故障时，熔丝又能迅速熔断，保护电动机。     

建筑工程中的防雷接地技术及避雷问题分析

本文笔者对柱内两根主筋作接地引下线的安装、断接螺栓的安装、混凝土构件中钢筋与接地极的连接、柱内主筋引出点的安装方法等进行了阐述，并对屋面装修后的避雷问题提出了一些看法，个人经验，供同行参考。     

Diagnosis of Multiple Fixture Faults in Multiple-Station Manufacturing Processes Based on State Space Approach

Dimensional quality is one of the most critical challenges in industries, which uses the multistage manufacturing process (MMP) such as assembly and machining for automotive and aerospace industries.According to investigations, fixture faults accounted for 72% of all the dimensional faults. Previous studies focused on only one fault or multiple faults occurred in one station or one fault in multiple stations, but these cases rarely appear in the real manufacturing. This paper presents a method for diagnosis of multiple fixture faults in the multi-station manufacturing process. The proposed method is based on the state space model of the MMP processes, which carries the information of the fixture layout geometry and sensor position. To identify the root cause, three continuous steps were used: a) development of the state space model and the construction of the statistics variables on offline mode, b) measurement of the coordinate measuring machines data on online mode and calculation of the statistics variables, and c) diagnostic algorithm for identifying the root cause. The presented paper integrates the state space model of the manufacturing processes and hypothesis test considering the impact of the measure noises. A case study verifies the proposed method.     

未来装备医工程思维

按照耗散结构理论，人类与其所创造的装备在本质上是有共性的，在与疾病和与故障的斗争方面也有很多相同或相近之处。在系统论的指导下，将医学科学理论和方法用于装备的故障诊断、预测和防治，有可能逐步形成用工程手段来防治故障的专门用于装备的“医学”——“装备医工程”(PME， plant medicine engineering);讨论了疾病和故障成因及其诊断、病因和故障机理的深层规律、治愈和自愈、治标和治本等共性问题，并就汲取中医的黑箱法和西医白箱法的精髓，创建医工程的水晶箱法进行了探讨；应用上述理论，对当前设备诊断技术研究的若干误区进行了分析。     

软盘驱动器的维护

文章详细阐述了计算机常用3．5英寸软盘驱动器经常出现的故障及其排除方法，重点讲解了软驱寻道故障、软驱磁头故障和软驱写保护故障．     

某警戒雷达机内测试设备的分析与评估

本文结合某新型警戒雷达的实际使用情况,分析了该雷达机内测试设备(BITE)的设计特点和几个实例,指出了设计的优点和存在的问题,从中得到新雷达BITE设计的几点启示和建议。