外文翻譯--風(fēng)扇軸失效原因的調(diào)查

1、中文 中文 5400 字出處： 出處：Engineering Failure Analysis, 2010, 17(5): 1188-1194 附錄 AInvestigation of causes of fan shaft failureM. Ristivojevic, R. Mitrovic and T. LazovicBelgrade University, Faculty of Mechanical Engineering,

2、Kraljice Marije 16, Belgrade 11120, SerbiaAbstractEnergy efficiency of thermal power plants depends on the vital plant elements’ reliability levels. In order to preserve high level of energy efficiency, the vital element

3、s’ operational capability is continually monitored via observing the working temperature, vibration and noise levels. Yet, however, in spite of this, and usually due to inadequate maintenance, inadequate assembly, errors

4、 in the design or manufacturing processes, or due to accidents, abrupt failures of the plant’s vital elements can occur. An example for this is the volumetric destruction of the fresh air fan shaft due to melting of the

5、shaft at the shaft’s stationary support. In addition to shaft destruction, the fan bearing and wheel blades have undergone destruction as well. This breakdown has occurred in the course of continual monitoring of the bea

6、ring service temperature and vibrations levels. Former studies, aimed at determining the breakdown causes, were based on the detailed examination of the damaged elements’ materials and detailed analysis of the bearing se

7、tting arrangement. Considering the fact that the shaft stationary support was realized by means of a double-pressed joint, a thorough analysis has been made in this paper of the pressed joint operational capability in th

8、e boundary service conditions, in order to determine the extent to which the pressed joint participated in the breakdown.immovable.In service conditions, proper fan operation is ensured by continual monitoring of the ele

9、ctric motor service temperature, as the driving machine, and of both bearings on the fan shaft. Due to high operating temperatures, the plant components’ cooling has been provided for.The electric motor is air cooled, wh

10、ile the initial structural solution of water cooling was replaced by air cooling. Yet, however, in spite of the continual monitoring of the fresh air fan assembly’s vital elements’ operational capability, a major breakdo

11、wn occurred, i.e. the volumetric shaft destruction. In order to establish the causes of the breakdown, a thorough examination of the quality of materials was undertaken (micro-structure examining and determining the shaf

12、t material’s chemical and mechanical properties) [1] and design solution for the bearing setting arrangement was analyzed [2]. Literature [1] provides images of the breakdown status of the fixed support’s bearing assembl

13、y setting arrangement. Literature [2] provides proposed optional solutions, aimed at improving the actual structural design of the shaft setting arrangement at the immovable support. Bearing in mind that the bearing sett

14、ing arrangement in the shaft’s fixed support is realized by means of a double-pressed joint: shaft–bushing and bushing–bearing inner ring, this paper depicts a thorough analysis of the pressed joints’ operational capabil

15、ity in the extreme service and design conditions. Based on the performed analysis, the contribution of the pressed joints to the fan shaft breakdown in thermal plants has been recognized.2. Setting arrangement analysis i

16、n fixed shaft supportThe fan shaft sleeve was fitted with a bushing to which a self-adjusting barrel-shaped bearing was positioned as well as a disk. The axial movement of the inner bearing ring at the sleeve was prevent