弹流油膜的界面滑移测量及其对往复动态油膜的影响
发布时间：2018-10-12 06:51
【摘要】：本文主要实现了弹流油膜界面滑移现象的定量测量并以此为依据研究了往复运动条件下油膜的动态响应特性。 改进了光弹流实验台的运动控制系统，即用VisualBasic语言对运动控制卡进行编程，实现了微尺度内的高精度往复运动以及步进运动和多段运动等运动方式。满足了实验对于不同工况的需要。 理论计算了卷吸运动的初始时刻封油核心的压力分布。用弹性变形矩阵和测得的油膜厚度求解油膜的压力，，迭代得到收敛的压力值，为分析压力分布对界面滑移的影响做准备。 实验研究了弹流接触区内油膜的界面滑移现象，通过追踪封油核心的运动位移实现了滑移长度的定量测量。系统分析了压力、初始封油深度、卷吸速度等不同因素对滑移长度的影响。 测量了界面滑移条件下往复运动弹流润滑的油膜特征，实验研究了载荷、振幅、频率和界面条件等不同因素对往复动态弹流油膜的影响。特别地，当采用油/SiO2界面和钢球微振幅往复运动条件下，冲击油膜的封油核心的振动振幅明显衰减，且发生半个周期的相差。
[Abstract]:In this paper, the quantitative measurement of the slip phenomenon at the interface of elastohydrodynamic oil film is carried out and the dynamic response of the oil film under reciprocating motion is studied. In this paper, the motion control system of the photoelastic fluid experiment bench is improved, that is, the motion control card is programmed with VisualBasic language, and the high precision reciprocating motion, step motion and multi-segment motion are realized in the micro-scale. The experimental results meet the needs of different working conditions. The pressure distribution of the oil sealing core at the initial stage of the entrainment motion is calculated theoretically. The pressure of oil film is calculated by using the elastic deformation matrix and the measured oil film thickness, and the convergent pressure value is obtained iteratively, so as to prepare for the analysis of the influence of pressure distribution on interfacial slip. The interfacial slip of oil film in elastohydrodynamic contact region is studied experimentally. The quantitative measurement of slip length is realized by tracking the moving displacement of the oil sealing core. The effects of pressure, initial oil sealing depth and entrainment speed on the slip length are systematically analyzed. The oil film characteristics of elastohydrodynamic lubrication in reciprocating motion under the condition of interfacial slip were measured. The effects of load amplitude frequency and interface conditions on the oil film of reciprocating dynamic elastohydrodynamic were investigated experimentally. In particular, under the conditions of oil / SiO2 interface and the reciprocating motion of steel ball micro-amplitude, the vibration amplitude of the oil sealing core of oil film impingement obviously attenuates, and the difference of half period occurs.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH117
本文编号：2265185
[Abstract]:In this paper, the quantitative measurement of the slip phenomenon at the interface of elastohydrodynamic oil film is carried out and the dynamic response of the oil film under reciprocating motion is studied. In this paper, the motion control system of the photoelastic fluid experiment bench is improved, that is, the motion control card is programmed with VisualBasic language, and the high precision reciprocating motion, step motion and multi-segment motion are realized in the micro-scale. The experimental results meet the needs of different working conditions. The pressure distribution of the oil sealing core at the initial stage of the entrainment motion is calculated theoretically. The pressure of oil film is calculated by using the elastic deformation matrix and the measured oil film thickness, and the convergent pressure value is obtained iteratively, so as to prepare for the analysis of the influence of pressure distribution on interfacial slip. The interfacial slip of oil film in elastohydrodynamic contact region is studied experimentally. The quantitative measurement of slip length is realized by tracking the moving displacement of the oil sealing core. The effects of pressure, initial oil sealing depth and entrainment speed on the slip length are systematically analyzed. The oil film characteristics of elastohydrodynamic lubrication in reciprocating motion under the condition of interfacial slip were measured. The effects of load amplitude frequency and interface conditions on the oil film of reciprocating dynamic elastohydrodynamic were investigated experimentally. In particular, under the conditions of oil / SiO2 interface and the reciprocating motion of steel ball micro-amplitude, the vibration amplitude of the oil sealing core of oil film impingement obviously attenuates, and the difference of half period occurs.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH117
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