水润滑飞龙滑动轴承弹流润滑性能分析

发布时间：2018-03-23 23:13

本文选题：水润滑　切入点：飞龙轴承　出处：《青岛理工大学》2015年硕士论文

【摘要】：水的粘度很小,所以用水做润滑剂时要选用弹性模量远远小于金属的飞龙材料制作水润滑轴承。本文针对飞龙材料的滑动轴承,建立水润滑的无限长线接触弹流润滑模型,运用多重网格法来求解Reynolds方程,用多重网格积分法求得膜厚方程中的弹性变形项,运用逐列扫描法求解能量的方程,得到了不同因素影响下的水润滑飞龙滑动轴承的弹流润滑数值解。主要影响因素包括:温度、表面粗糙度、微凹坑织构、固体颗粒以及外部冲击载荷等影响因素。首先,对水润滑飞龙滑动轴承进行稳态等温弹流润滑分析。数值分析得到水润滑飞龙轴承压力和膜厚的分布规律;探讨了不同载荷、转速的大小对水润滑飞龙轴承入口区压力、压力峰和膜厚的影响,并比较了三种不同塑料材料的水润滑性能。其次,对水润滑飞龙滑动轴承进行考虑表面粗糙度的热弹流润滑分析。对比分析等温弹流解和考虑热效应的弹流数值解;探讨了考虑余弦表面粗糙度对水润滑飞龙轴承压力和膜厚的影响,以及水润滑膜压力和膜厚随粗糙度幅值和波长的变化规律。第三,建立了微凹坑织构的摩擦副模型,得到了圆弧形、矩形以及直角三角形三种微凹坑织构下水润滑飞龙轴承的完全数值解,讨论了不同滑滚比下水润滑飞龙轴承最小膜厚的变化,同时也分析了微凹坑织构的深度、凹坑直径对压力和膜厚的影响。第四,考虑热效应和轴承间隙中固体颗粒的影响,对水润滑飞龙轴承进行流体润滑数值分析。建立含固体颗粒的流体润滑模型,修正Reynolds方程,数值模拟得出含固体颗粒时弹流润滑膜压力与膜厚的变化情况,与不含颗粒的热解进行对比,研究颗粒尺寸、颗粒位置及轴承相对间隙大小对存在颗粒的飞龙轴承润滑性能的影响,进一步研究粗糙度与固体颗粒同时存在时压力与膜厚的分布。最后,建立了考虑不同形式的外冲击载荷的水润滑飞龙滑动轴承的弹流润滑几何模型,数值模拟了轴承在不同形式冲击载荷如阶跃、矩形和正弦冲击载荷影响下的水润滑膜压力以及膜厚在不同瞬时的变化趋势,研究冲击载荷幅值和脉宽对水润滑飞龙轴承润滑性能的影响。
[Abstract]:The viscosity of water is very small, so water should be used as lubricant to make water lubricated bearing with elastic modulus much smaller than metal. In this paper, an infinite line contact elastohydrodynamic lubrication model of water lubrication is established for the sliding bearing of flying dragon. The multigrid method is used to solve the Reynolds equation, the elastic deformation term in the film thickness equation is obtained by the multi-grid integral method, and the energy equation is solved by the row by row scanning method. The numerical solution of EHL of hydrolubricated flying dragon sliding bearing is obtained under the influence of different factors. The main influencing factors include temperature, surface roughness, microcrater texture, solid particle and external impact load, and so on. First of all, the influence factors such as temperature, surface roughness, microcrater texture, solid particle and external impact load are obtained. The steady state isothermal elastohydrodynamic lubrication analysis of water lubricated flying dragon bearing is carried out. The distribution of pressure and film thickness of water lubricated flying dragon bearing is obtained by numerical analysis, and the pressure at the inlet area of water lubricated flying dragon bearing under different loads and rotational speeds is discussed. The effects of pressure peak and film thickness on the water lubricating properties of three different plastic materials were compared. The thermo-elastohydrodynamic lubrication analysis of water-lubricated flying dragon sliding bearing considering surface roughness is carried out. The isothermal elastohydrodynamic solution and the elastohydrodynamic numerical solution considering thermal effect are compared and analyzed. Considering the influence of cosine surface roughness on the pressure and film thickness of water-lubricated flying dragon bearing, the variation of hydrophilic synovium pressure and film thickness with roughness amplitude and wavelength is discussed. Thirdly, the friction pair model of microcrater texture is established. The complete numerical solution of the hydrolubricated flying dragon bearing with circular arc, rectangular and right triangle microcrater texture is obtained. The variation of the minimum film thickness of the hydrolubricated flying dragon bearing with different slip ratio is discussed, and the depth of the microcrater texture is also analyzed. The influence of pit diameter on pressure and film thickness. Fourthly, considering the thermal effect and the influence of solid particles in the bearing clearance, the fluid lubrication model of water lubricated flying dragon bearing is established, and the Reynolds equation is revised. The change of EHL film pressure and film thickness with solid particles was obtained by numerical simulation, and compared with pyrolysis without particles, the particle size was studied. The influence of particle position and relative clearance of bearing on lubrication performance of flying dragon bearing with particle is studied. The distribution of pressure and film thickness when roughness and solid particle exist simultaneously is studied. An elastohydrodynamic geometric model of hydro-lubricated flying dragon sliding bearing with different external impact loads is established, and the numerical simulation of the hydro-hydrodynamic lubrication geometric model of the hydro-hydrodynamic sliding bearing with different forms of impact load, such as step, is presented. The influence of impact load amplitude and pulse width on the lubricating performance of water lubricated flying dragon bearing was studied under the influence of rectangular and sinusoidal impact load on the water moistening synovial film pressure and film thickness in different instantaneous trends.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH133.3

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