轴颈三维运动状态下的滑动轴承润滑分析

发布时间：2018-04-08 12:16

本文选题：滑动轴承　切入点：润滑分析　出处：《安徽工程大学》2012年硕士论文

【摘要】：内燃机作为一种重要的动力装置,广泛运用于国防、交通、工农业等各个领域。而作为现代化、高速化、结构更紧凑的内燃机(包括汽油机、柴油机)的重要零部件之一的滑动轴承,已经成为了发动机减少能源消耗、增强运行稳定性以及提高输出功率、效率的制约因素之一。因此对内燃机轴承系统下的滑动轴承润滑性能的研究显得尤其重要。径向滑动轴承流体动力润滑分析是滑动轴承设计的基本问题,有关滑动轴承动力润滑的理论研究已基本成熟。近年来,考虑实际工况(如轴承制造与装配误差、轴瓦表面粗糙度、轴瓦变形、轴颈倾斜等)对轴承润滑性能的研究也日趋完善。上述现有研究的理论依据,基本上都是建立在只考虑轴颈的圆周运动、而不计轴颈轴向运动的二维运动Reynolds方程的基础之上。然而,在一些特殊情况下,轴颈的轴向运动确实存在。本文发现李震教授、何芝仙教授、桂长林教授在研究内燃机曲轴轴承系统动力学摩擦学耦合问题时,实际工况下内燃机曲轴主轴承的轴心轨迹是三维的,即曲轴主轴承轴颈同时存在圆周、径向和轴向的三维运动,在对曲轴主轴承进行润滑分析时,却未考虑轴颈的轴向运动,有关轴颈三维运动情况下的滑动轴承润滑分析也尚未见报道。本课题研究来源于导师选题,是对轴颈二维运动下滑动轴承润滑性能问题的延伸,李震教授、何芝仙教授和桂长林教授对轴颈二维运动的Reynolds方程研究已经建立了成熟的体系,在前人的研究基础上,主要运用相类似的方法分析了轴颈三维运动状态下滑动轴承的润滑性能。首先,本文分析了近些年来滑动轴承润滑领域的相关内容的研究以及所取得的最新研究进展,阐述了研究滑动轴承润滑的重要意义。其次,以现有的轴颈倾斜的轴承模型为基础,利用有限差分法对滑动轴承润滑分析的二维Reynolds方程的油膜反力进行求解,再积分求出其他的摩擦学性能参数,运用编程软件编写润滑程序计算得到结果。第三,提出了轴颈圆周、径向和轴向三维运动状态下滑动轴承润滑分析的Reynolds方程,在二维Reynolds方程基础上加上轴向运动项,研究分析了轴颈轴向运动对滑动轴承的摩擦学性能的影响。第四,以N4105内燃机中曲轴-轴承系统为研究模型,根据柔性曲轴-轴承系统多体动力学分析ADAMS仿真模型得到的主轴颈轴心运动参数,调用第三章的润滑程序求出五个主轴颈在轴颈三维运动状态下的摩擦学特性,并和轴颈二维运动作比较。最后,针对本课题所作的主要工作和创新点作出总结,并对以后的进一步研究提出了作者的一些个人看法。
[Abstract]:As an important power device, internal combustion engine is widely used in many fields, such as national defense, transportation, industry and agriculture.As one of the most important parts of modern, high-speed and compact internal combustion engines (including gasoline engines and diesel engines), sliding bearings have become the engine to reduce energy consumption, enhance operational stability and increase output power.One of the constraints to efficiency.Therefore, it is very important to study the lubrication performance of sliding bearings in internal combustion engine bearing system.The hydrodynamic lubrication analysis of radial sliding bearings is a basic problem in the design of journal bearings, and the theoretical research on the dynamic lubrication of journal bearings has been basically mature.In recent years, the study of bearing lubrication performance has been improved by considering the actual working conditions (such as bearing manufacturing and assembly error, bearing surface roughness, bearing deformation, journal tilt, etc.).The theoretical basis of the present research is based on the Reynolds equation of two-dimensional motion which only considers the circular motion of the journal and does not take account of the axial motion of the journal.However, in some special cases, the axial motion of the journal does exist.In this paper, it is found that when Professor Li Zhen, Professor he Zhixian and Professor Kui Changlin are studying the dynamic tribological coupling of crankshaft bearing system of internal combustion engine, the axial center track of crankshaft main bearing of internal combustion engine under actual working condition is three dimensional.That is to say, there are three dimensional motions in the journal of crankshaft main bearing at the same time, which are circumferential, radial and axial, but the axial motion of journal is not taken into account in the lubrication analysis of the main bearing of crankshaft.Lubrication analysis of journal bearing under three-dimensional motion of journal has not been reported.The research is an extension of the lubrication performance of journal bearing under the two dimensional motion of journal. Professor Li Zhen, Professor he Zhixian and Professor Gui Changlin have established a mature system to study the Reynolds equation of the two-dimensional motion of journal.On the basis of previous studies, the lubrication performance of journal bearings under the condition of three-dimensional motion of journal is mainly analyzed by using similar methods.First of all, this paper analyzes the recent researches on the lubrication of sliding bearings and the latest research progress, and expounds the significance of the study on lubrication of sliding bearings.Secondly, based on the existing journal tilting bearing model, the oil film reaction force of the two-dimensional Reynolds equation of journal bearing lubrication analysis is solved by using the finite difference method, and the other tribological performance parameters are obtained by integration.The results are obtained by using the program software to compile the lubrication program.Thirdly, the Reynolds equation for lubrication analysis of journal bearings under the condition of circular, radial and axial motion of journal journal is presented. The axial motion term is added to the two-dimensional Reynolds equation.The influence of axial motion of journal on the tribological performance of sliding bearing is studied.Fourthly, taking the crankshaft-bearing system of N4105 engine as the research model, according to the multi-body dynamics analysis of the flexible crankshaft-bearing system, the motion parameters of the main journal axis are obtained by the ADAMS simulation model.The tribological characteristics of the five spindle necks under the three dimensional motion of the journal are obtained by using the lubrication program in chapter 3, and compared with the two dimensional motion of the journal.Finally, this paper summarizes the main work and innovation of this subject, and puts forward some personal opinions of the author for the further research in the future.
【学位授予单位】：安徽工程大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117.2

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