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齿轮式机油泵可靠性研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/10/29 7:46:51  

摘要:齿轮式机油泵是动力机械的重要组成部分,是其润滑系统的核心。凭借其流量大、压力高、制造成本低、维修简单等优点,它在发动机的润滑系统中得到最广泛的应用。润滑系统的作用就像血液循环对人体的作用,而机油泵是润滑系统的心脏,机油泵的可靠性决定了发动机的可靠性乃至整个机械系统的可靠性。因此,对齿轮式机油泵进行可靠性研究的意义十分重大。

目前齿轮式机油泵的可靠性研究主要是针对其零部件进行可靠性评估,并未对机油泵整体进行评估。本文将齿轮式机油泵分解为17个单独的零件,定义每个零件的故障模式,以此为依据提出对齿轮式机油泵整体系统建立故障树,并对其进行定性分析;对齿轮式机油泵故障树进行了定量计算,运用模糊数法确定故障树底事件概率;将失效相关纳入考虑范围,提出了一种全新的齿轮式机油泵可靠度计算方法;将求得的底事件概率代入全新的和传统的两种方法然后进行比较,得出的结果发现前者略小于后者,因此前者较为精确;绘出了齿轮式机油泵的寿命预测图,分析指出合理的检查维护时间。

经过对齿轮式机油泵的可靠性研究得出结论:

1)在对齿轮式机油泵进行可靠性研究时需要将失效相关性纳入考虑范围内,这样有利于提高分析结果的精确性。

2)模糊数法可以简化齿轮式机油泵底事件概率的求解过程。

3)运用双参数下的威布尔分布函数绘出齿轮式机油泵可靠度分布曲线(即为齿轮式机油泵寿命预测曲线),从图中可以得到维护的具体时间。

由此得出的研究结果,有助于提高齿轮式机油泵可靠性分析的效率,可为齿轮式机油泵的性能分析和结构优化、齿轮式机油泵传统可靠性研究方法的补充与完善提供参考。

Oil gear pump is an important part of thepower machinery and the core of its lubrication system. With its advantages ofhuge flow, high pressure, low manufacturing cost and simple maintenance, it ismost widely used in the engine lubrication system. The function of thelubrication system is like the effect of blood circulation on the human body,and the oil pump is the heart of the lubrication system.So the reliability ofthe oil pump determines the reliability of the engine ,even the reliability ofthe entire mechanical system. Therefore, the reliability analysis of oil gearpump is of great significance.

At present, the researches on thereliability of oil pump mainly focused on the reliability evaluation of itscomponents and didn’t evaluate the whole oil pump. In this paper, the gear oilpump is decomposed into 17 separate parts, and the failure mode of each part isdefined. Based on this, a fault tree is established for the gear oil pumpoverall system and qualitative analysis is carried out.The fault tree of thegear oil pump is quantitatively calculated, and the probability of the bottomof the fault tree is determined by the fuzzy number method.Taking the failurecorrelation into consideration, a new calculation method for the reliability ofgear oil pump is proposed.Substituting the obtained bottom event probabilityinto a new and traditional method and then comparing it, the result shows thatthe former is slightly smaller than the latter, so the former is moreaccurate.The life prediction chart of the gear oil pump is drawn, and theanalysis indicates reasonable inspection and maintenance time.

After researching the reliability of thegear oil pump,this article draws the followingconclusions:

1)The failure correlation needs to be takeninto consideration in the reliability study of this research object, which isbeneficial to improve the accuracy of the analysis result.

2)The fuzzy number method can simplify thesolving process of gear oil pump bottom event probability.

3)Use the two-parameter Weibulldistribution function to plot the reliability distribution curve of the gearoil pump (that is, the life curve of the gear oil pump). Analyze the lifeprediction chart and propose the specific time for maintenance.

The results obtained from this study willhelp improve the efficiency of the reliability analysis of the gear oil pumpand provide reference for the performance analysis and structural optimizationof the gear oil pump and the supplement and improvement of traditionalreliability research methods for the gear oil pump.

关键词:齿轮泵;可靠性;失效相关;威布尔分布

Gear pump; Reliability; Failurecorrelation; Weibull distribution

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