| As an important part of mechanical equipment, the service life and job performance of bearing has significance influence on if the mechanical equipment can working well. Especially for the more precision、higher speed and stronger capacity of mechanical equipment,it is more strict to the equipment of bearing performance and the bearing need high speed and large capacity. Bearing lubrication is a key factor affecting bearing performance, and good lubrication can increase the bearing capacity and service life, which is the important to guarantee for mechanical equipment can run normally. So the bearing lubrication is universal attention. Experimental and numerical simulation are the main means to research the bearing movement characteristics and dynamic analysis. However, experimental research method is usually influenced by the factors of operation and external environment, which may leads to the deviation of the experiment result. To the contrary, the numerical simulation method rule out the influence of all kinds of people and environment, more and more researchers study the bearing lubrication mechanism by simulating method.At present, most of the simulation is conducted by finite element simulation software analysis and calculation, this method can be used for some simple structure analysis, but if using this method for the analysis of the fluid dynamics, due to the arbitrary of fluid flow, at the time of computing it needs to mesh and calculate the grid once more time of the model in each time step when calculating, and the grid may deformation and mutation in the process of calculating, which will lead to inaccurate results. So the finite element method for high speed collision, large deformation and the free surface flow has some limitations on the solution of the nonlinear problem. In order to solve this problem better, need to seek new ways to solve this kind of complex nonlinear flow problem. Smooth Particle hydrodynamics is a kind of meshfree method based on Lagrange, its advantage is not fixed grid to connect nodes, but by a series of independent property of a single particle, and the simulation is conducted under the control equations.This article applies the basic theory of Smoothed Particle Hydrodynamics- SPH method discrete mathematical model of squeezing oil film in bearing micro contact area, the oil film is decomposed into a single particles, the particles with their own physical properties, such as quality, density, velocity, viscosity, internal energy and so on, and moving under the constraint of control equation. The discreteed oil film consistent with the oil film in real situation. So it can describe the movement rule of squeezing oil film accurately.In this paper, by applying the SPH method to micro contact area is mainly in the following several aspects of research: 1.According to the simplified bearing geometric model to establish its mathematical model, Based on the basic theory of SPH method combined with the Navier- Stokes equations, the numerical analysis software by considering the nonlinear behavior of oil film is developed using C language, and the special micro contact region of squeeze film flow behavior were simplified and the SPH numerical model is established. 2.According to the established SPH numerical calculation model, select the appropriate control equation, calculating and analysis the model.Study the influence of the squeezing oil film viscosity on movement characteristics of the squeezing oil film flow characteristics on contact area under the condition of full rich oil. 3.The influence of squeeze film pressure and velocity were analyzed under the full rich oil lubrication state by changing the oil film viscosity on micro contact region. |
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