[雙語(yǔ)翻譯]液壓系統(tǒng)外文翻譯--基于油液污染的液壓系統(tǒng)故障預(yù)防

1、2950 英文單詞， 英文單詞，1.6 萬(wàn)英文字符，中文 萬(wàn)英文字符，中文 4800 字文獻(xiàn)出處： 文獻(xiàn)出處：Singh M, Lathkar G S, Basu S K. Failure prevention of hydraulic system based on oil contamination[J]. Journal of the institution of engineers (India): series C, 2012

2、, 93(3): 269-274.Failure Prevention of Hydraulic System Based on Oil ContaminationM. Singh ;G. S. Lathkar ;S. K. BasuAbstract Oil contamination is the major source of failure and wear of hydraulic system components. As p

3、er literature survey, approximately 70 % of hydraulic system failures are caused by oil contamination. Hence, to operate the hydraulic system reliably, the hydraulic oil should be of perfect condition. This requires a pr

4、oper ‘Contamination Management System’ which involves monitoring of various parameters like oil viscosity, oil temperature, contamination level etc. A study has been carried out on vehicle mounted hydraulically operated

5、system used for articulation of heavy article, after making the platform levelled with outrigger cylinders. It is observed that by proper monitoring of contamination level, there is considerably increase in reliability,

6、economy in operation and long service life. This also prevents the frequent failure of hydraulic system.Keywords：Oil contamination; RPN; FMEA ; Failure preventionIntroductionThe development of advance technologies to mee

7、t today’s requirement for compactness needs sophisticated high pressure system. For reliable and efficient operation, a high quality and clean oil is required. Oil contamination is the major source of failure and wear of

8、 Hydraulic system components. As per literature survey approximately 70 % of hydraulic system failures are caused by oil contamination [1]. Detailed study reveals that major causes of failure of pumps, valves, actuators

9、are due to contamination. The contamination once developed/ingressed in the system, while circulating in the system, damage the surface of component or stop the movement of valve spool/other moving parts resulting in fai

10、lure of the system.This paper introduces contamination and its sources of, damage caused by contamination, types of failure, standards for measurements of oil contamination, examples of hydraulic system failure due to oi

11、l contamination and the failure preventions of hydraulic systems.Results are reported for ‘‘Off Line Filtration System’’ and also worked out a component rating with regard to contamination. At the end, the techniques to

12、prevent contaminants are given.ContaminationA contaminant is any material foreign to a hydraulic fluid that has a deterious effect on the fluid performance in a system. Contamination in a hydraulic system may consist of

13、solid, liquid or grease or combination of these. Solid insoluble contaminants grit, dust metal particle pose the greatest problems since they are most prevalent and the most damaging. Study in this paper is limited to so

14、lid particle contamination only.Sources of ContaminationThe sources of contamination [2] are given below:Ingressed contamination Built-in contamination Internally generated contamination(i) Reservoir vent port (i) Hydrau

15、lic fluid degradation (i) Due to wear and abrasion by the particlesIn the field of oil contamination, spectroscopic oil analysis programme (SOAP), dual reading ferrograph and analysis of ferrograms, specially in heated c

16、ondition, are used to identify the alloying elements in the contaminants. Considerable amount of research work has done by Basu et al. [7, 8] in dealing with failure analysis and condition monitoring in industrial proble

17、ms.Table 1.Fluid cleanliness required for typical hydraulic componentsComponents ISO code NAS codeServo control valves 16/14/11 5Proportional valves 17/15/12 6Vane and piston pumps/motors 18/16/13 7Directional and pressu

18、re control valves 18/16/13 7Gear pumps/motors 19/17/14 8Flow control valves, cylinders 20/18/15 9New unused fluids 20/18/15 9Example of Hydraulic System Failure Due to Oil Contamination Using FMEA (Failure Mode and Effe

19、ct Analysis) MethodA detailed study was carried out on the hydraulic system which is used for articulation of vehicle mounted heavy article. For this the RPN (Risk Priority Number), which is a multiplication of Occurrenc

20、e (O), Severity (S) and Detection (D) was worked out based on experiments conducted and past experience in the field. The guidance scale for OSD was taken as 1–10 and confidence level of 90 %. With this the threshold val

21、ue of pursing failures is an RPN equal to or greater than 100 as guided by Stamatis [9]. The details assessment of RPN values of the major components of the system studied by the authors are listed in Table 2. Normally t

22、hreshold value, in FMEA with RPN analysis, is found out by the mean of RPN values of all components in the system. But since these RPN data are extremely asymmetric in distribution, the median value is taken instead of M

23、ean. The median value comes to 180, which is the thres- holding value. Above this value of RPN all the units or components are critical. Critical components on the basis of this formulation can be arranged in rank as und

24、er:Units Causes of failure Rank of critical itemPump High contamination level of oil IPressure line filter Clogging of filter due to contaminant of oil IIProportional direction control valve High contamination level of o

25、il IIITilt cylinders for articulation Pilot operated valve not functioning IVTable 2 .Details of hydraulic components failures due to high oil contaminationComponents/systemsFunction Failure mode Effect of failure Causes