风机的故障诊断和风机转子现场动平衡

通过对二高线设备振动监测使用和一些故障的分析,介绍了风机故障的诊断思路、步骤及振动机理,并根据相位对此类故障进行了诊断与分析,提高了故障诊断故障的准确率。简单介绍现场动平衡技术。     

机械设备的状态监测与故障诊断 第八讲 齿轮状态监测与故障诊断

齿轮是许多机械设备中的重要组成部分,是机械没备中易于发生故障和损坏的零件。本讲主要介绍了齿轮故障的类型及故障原因、齿轮状态监测的主要方法,并重点介绍了齿轮振动特征分析及齿轮故障的振动诊断方法。     

棒线裙板中继故障的解决方法

裙板中继故障是棒材生产线的一种主要故障,发生频繁、故障较难预测,同时处理时间较长,对生产影响较大。文章介绍了描述了八钢2#棒材裙板中继故障的解决办法,较好解决了此故障。     

数控镗铣机床故障原因分析与处理

以数控镗铣机床TK6920为例，介绍了西门子SINUERIK 840D数控系统，研究、分析了数控机床的轴振动故障、轴漂移故障、回零点故障及位置环故障的原因，并提出了处理方法。     

空分设备运行故障原因分析及处理

介绍了空分设备运行故障的种类,分别阐述仪电控故障、机械故障、工艺故障的种类,分析了故障产生的原因,提出了排除故障的措施,使空分设备的运行安全性和稳定性得到提高。     

差压变送器的应用与故障分析

在工业自动化生产中,差压变送器已得到了非常广泛的应用,简要介绍了差压变送器的工作原理、常用的3种测量应用方式、选型原则和常见的故障诊断方法,并重点对电气故障、表计故障、误操作故障和取压管道故障等故障现象进行了重点分析。     

PLC运行故障分析

分析了球团厂可编程序控制器使用过程中的常见故障,简单介绍了PLC故障及现场控制设备故障的分析和预防、处理方法,最后着重介绍了电磁干扰对PLC系统影响以及预防措施。     

液压缸的故障判断

文章介绍了液压缸的故障现象，深入分析了产生故障的原因以及排除液压缸故障的种种措施。     

矿热炉变压器故障分析及处理

以矿热炉变压器故障实例，系统介绍了在现场条件下变压器故障的判断的处理，提出了恶劣工作环境下矿热炉变压器的运行和维护方法及注意事项，介绍了变压器故障现场修理工艺。     

逆变器故障处理实践

介绍了石钢小型棒材连轧生产线西门子传动柜3次过流报警故障经过,故障均为F011报警信号,记录波形和现场状况有很大差异。按照事故处理原则,通过分析和试验找出了原因,分别为:触发板故障、控制电源板连线故障和负荷故障。为今后快速查找故障,积累了实践经验。     

A psychological analysis of Adolf Hitler's decision making as commander in chief: Summa confidentia et nimius metus.

This study is an attempt to analyze Hitler's decision making during World War II. Based on detailed historical sources, we specifically analyzed Hitler's decision-making failures and investigated the possible causes for these failures following theories on cognition, motivation, and action regulation. Failures such as underestimation of an opponent and overestimation of one's own capabilities, the displacement of responsibility for failures on scapegoats, the substitution of easily solvable problems for difficult ones, methodism in decision making, and lack of self-reflection are discussed and detailed examples are provided. These failures ultimately functioned to maintain Hitler's self-confidence. We integrate the failures into a model that explains the origins of Hitler's decision making. Although Hitler's behavior could certainly be judged as “evil,” the analysis goes further and thus can help leaders learn from these failures. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

电气设备发热故障的预防和处理

介绍了电气设备发热故障的危害和形成原因,并就各种原因引起的发热故障的预防与处理方法进行了阐述。     

Probabilistic Failure Prediction for Deteriorating Pipelines: Nonparametric Approach

Component failures in water distribution systems are usually predicted by parametric models where the model parameters are determined by projecting the past failure rates of the component to the future. This paper shows that in such techniques, failures are implicitly assumed to be stationary random processes. However, due to the nonstationary nature of some influencing factors, this assumption may lead to inaccurate predictions. A new nonparametric technique is developed for failure prediction of classes of pipes considering this nonstationary process. The presented technique uses limited data that are typical to the databases of water distribution systems. In this method, maximum likelihood estimates of the probability of future failures are calculated and used, both to predict the number of failures occurring within a specified period of time in future, and to provide some lower and upper bounds (confidence intervals) for the estimations. This technique is applied to predict the failures of water pipes in western suburbs of Melbourne. Results of the predictions are compared with the empirical results from a failure record. Deviation of these predictions from empirical measures in terms of both rejection rates and mean-square errors of predictions are acceptable.     

稀油密封煤气柜冬季运行问题及防范措施

通过分析北方地区稀油密封煤气柜冬季运行时的一些常见问题,找出煤气柜故障的发生原因,并提出了有效的防范措施。     

汽轮机调速系统故障原因分析及处理

介绍并分析了热电厂汽轮机调速系统所发生故障。通过多次检修,找出原因并提出消除故障的措施,实现了机组的安全、经济运行。     

Statistical Modeling of the Serviceability of Sewage Pumps

Sewage pumping stations represent an element of the sewer system, which is directly responsible for affecting serviceability; i.e., failing pumps may result in combined sewer overflows or flooding. However, failures of sewage pumps are not yet incorporated in sewer assessments due to lack of data. This paper presents the analysis of pump failure data provided by two sewer management authorities in The Netherlands. Pump failures have been studied accounting for the nature of the failures, the operation and maintenance procedures of the management authority, the aging of the pumps, and the changes in the environment of pumps. The analysis shows that sewage pumps fail relatively often due to the composition of sewage and the discontinuous operation of the pumps. The interarrival time and the duration of failures are highly variable and independent of the specific function of the pump. Resulting pump failure characteristics are applied in a Monte Carlo simulation to calculate the impact of failures on combined sewer overflow volumes. The results indicate that the serviceability of sewer systems is significantly affected by failing pumps. Therefore, including pump availability in sewer system assessments should be considered.     

井下电动铲运机常见故障及维修探析

铲运机是金属矿山井下生产的主要设备,其合理配置、高效运行对矿山节能降耗、提高生产效率至关重要。以WJD-0.75型电动铲运机为例,列举了生产运行过程中出现的常见故障,分析了故障产生的原因,介绍了故障排除方法,总结了故障处理经验及教训,值得借鉴。     

经验法查找10kV单相接地线路

提出10kV接地故障的危害,接地方式的种类和选择,介绍人工查找10kv接地故障的管理和技术措施,阐明现场处理经验和注意事项,用流程图总结整个接地查找方法,实际效果显著。     

Analysis of Recent Bridge Failures in the United States

Over 500 failures of bridge structures in the United States between 1989 and 2000 were studied. The age of the failed bridges ranged from 1 year (during construction) to 157 years, with an average of 52.5 years. The most frequent causes of bridge failures were attributed to floods and collisions. Flood and scour, with the major flood disaster in 1993, contributed to the frequency peak of bridge failures (almost 53% of all failures). Bridge overload and lateral impact forces from trucks, barges/ships, and trains constitute 20% of the total bridge failures. Other frequent principal causes are design, detailing, construction, material, and maintenance. Comparison made among three periods of similar studies (1977–1981, 1982–1988, and 1989–2000) revealed almost similar trends, with most failures occurring during the bridge’s service life. Also, human-induced external events occurred frequently in all three periods, but were most dominant in the first and third periods. Technological advances in information systems have a great impact on data collection and analysis.     

10KV交联电缆热缩接头常见故障及对策

通过对１０ｋＶ交联电缆热缩接头常见故障的分析总结,找出了造成短路故障的主要原因,制定了行之有效的预防对策。