汽轮发电机振动故障专家系统诊断方法研究

通过对汽轮发电机振动故障机理、故障特征和故障原因的分析,建立了汽轮发电机振动故障特征表,根据振动故障特征表的知识以决策树的形式构建了汽轮发电机振动故障专家系统知识库,并建立了汽轮发电机振动故障专家系统决策树诊断模型。最后通过发电机振动故障实际案例对汽轮发电机振动故障专家系统诊断方法进行了验证,证明了其准确性和可行性。     

VOLVO铰接式卡车制动异响故障的处理

Volvo铰接式卡车具有生产能力最大化所需要的动力和优异的性能。该卡车在矿山领域使用具有十分广阔的前景。分析了VOLVO A40E铰接式卡车制动原理,对制动异响故障现象进行了描述和分析,并针对制动系统结构、原理及控制特点,根据故障现象并结合实际情况进行了故障判断、查找。最终找出了故障原因、解决了故障。     

冶金铁水车钩缓常见故障分析及治理措施

针对冶金铁水车钩缓常见的故障进行了统计并分析故障产生的原因,制定并采取了科学合理的治理措施,使故障得到了有效的控制或消除,为冶金铁水安全运输提供了保障。     

UPS故障导致机组DCS系统故障过程分析

分析电厂1号机组突发的DCS故障。由于DCS系统的电源UPS发生故障,DCS计算机非正常停电重启,失去了大量的故障过程数据。通过收集各系统残存数据,对DCS部分原始数据解读,并结合设备现象,分析出DCS系统故障的总脉络,分析出过程中机组的重要工艺保护,分析出UPS故障后导致DCS系统故障的关键所在,并进一步提出了冗余电源切换装置的技术要求。     

35kV隔离开关分合闸故障分析及处理

介绍了德兴铜矿变电站35k V隔离开关故障,并对故障情况进行分析,寻找解决隔离开关分合闸故障率高的问题,从变电站发生的各种分合闸故障找出最主要的影响因素,并对此因素进行攻关,在变电站实施攻关措施,并在各变电站加于应用,有效地解决了变电站35k V隔离开关分合闸故障次数多的问题,预防和杜绝不能正常分合闸跳闸现象,降低变电站故障次数,保障了变电站安全稳定运行。     

电炉炼钢电气故障分析与分类

本文对电炉炼钢热负荷试车以来发生的电气故障进行了分类,并介绍了较有特点的故障实例,通过总结故障原因,找到解决问题的方法。     

高压同步电动机定子绕组故障分析及修理

通过对高压同步电机定子绕组匝间故障的修复,对同步电机定子绕组匝间短路故障进行了简单的分析,并采用甩掉故障线圈的局部修理方法进行修复,减少了故障停机时间,取得了良好的效果。     

液压站油箱内油液外溢原因分析及对策措施

在正常生产期间,中厚板加热炉液压站发生了一起油箱内的油液急剧翻腾和外溢的奇特故障。经过现场分析判断,确定了故障原因,采取了应急处理措施,并在故障发生后实施了相应的改进措施,避免了同类故障的再次发生。     

一起220kV输电线路故障及保护动作分析

通过对现场设备和线路的检查、故障动作报告、故障录波,分析了一起线路接地故障的类型、过程和产生原因,对故障存在的疑点进行了分析和排查,并对故障中继电保护的动作行为进行了分析,得出了结论及工作改进的方向。     

压力机卡死故障的分析处理

本文通过对压力机卡死故障的处理 ,分析了该机的工作机理 ,并对处理该机故障过程中出现的液压故障进行了分析和总结。     

转炉净化系统故障剖析及处理

介绍了转炉净化系统易发生的几种故障并对常见故障进行了剖析，介绍了故障原因、危害及处理、预防措施。     

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。     

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)     

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。     

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.     

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。     

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。     

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.     

Effect of Common Cause Failures on Indirect Costs

Next generation bridge management systems will take into consideration multiple hazard scenarios and not only traffic loading and structural deterioration as they do now. The indirect costs used in these bridge management systems to determine optimal management strategies vary according to the hazard scenarios considered. The difference depends on whether or not the bridge failures are due to a common cause, such as a single flood or earthquake, or due to load events that may be considered statistically unrelated, such as truck loads. To illustrate the effect of common cause bridge failures on indirect costs, two examples are presented that treat the failures first as if they are due to statistically independent loading events and then as if they are due to a common cause. To examine the effect of bridge failures on indirect costs of the system, estimation is performed at the network level. The first example, on a simple network, shows the indirect cost estimate for all of the network condition states. The second example, on a complex network, shows the difference in the possible reduction of total indirect costs with a single bridge intervention as well as the change in intervention sequence. The main conclusions are that total indirect costs and optimal intervention sequences differ depending on whether or not bridge failures are due to a common cause, and that the largest changes in indirect cost estimation occur when simultaneously failed bridges affect the method of indirect cost incurrence.     

螺旋埋弧焊管焊接事故分析

着重分析送丝机构对焊接的影响 ,电弧爆裂声变化 ,焊缝宽度不均匀等螺旋埋弧焊管在生产过程中一些常见焊接事故产生的原因 ,并针对这些事故提出了防治措施和处理方法 .要求在焊接生产过程中 ,要认真做好设备运转记录 ,为预防和处理事故提供科学依据 ;对每一次发生的焊接事故要搞清现象 ,联系原理 ,区别情况 ,周密分析 ;从简到繁 ,由表及里 ,总结经验 ,及时整理 ;不断提高观察、判断、处理事故的能力 .