Study Of The Performance Of Sliding Bearing Based On Mass-Conserving Model

Numerical calculation model of lubrication has an influence on the computational results of performance parameters for sliding bearing.The P-? model based on mass-conserving boundary conditions achieves good results in practical application.The thesis mainly utilizes P-? model to study the performance parameters of sliding bearing,when it is in the steady state,micro-textured,and under the dynamic load:For a journal bearing in the steady state,respectively using Reynolds boundary conditions and P-? model to compute,the results from two models were compared.Under the condition of different length-diameter ratio,eccentricity and cavitation pressure,utilizing P-? model to analyze the carrying capacity,the attitude angle and the friction coefficient of journal surface.Researching infinite-length slider with grooves and slider with spherical dimples,it was shown that only mass-conserving model should be used when dealing with micro-textured bearings.The optimum textured portion of the carrying capacity can be obtained by numerical calculation.According to equal flux through different cross sections of P-? model,deducing oil-film pressure and carrying capacity of infinite-length parallel and inclined sliders with grooves.P-? model can be well applied to the numerical calculation of dynamic lubrication.It was applied to compute squeeze-flow of infinite-length parallel-plate and investigate variation of the cavitation area;Using the P-? model to simulate the response of journal bearing under dynamic load.Compared with P-? model,Reynolds' model largely underestimates the dynamic cavitated area.Experimental idea of measuring cavitation pressure based on P-? model is put forward.Under the static load,the shaft of journal bearing will stabilize in equilibrium point,utilizing the equilibrium position and static load to calculate the cavitation pressure.