三角形周期脉冲载荷对轧辊轴承弹流润滑的影响
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摘要
建立了三角形周期脉冲载荷作用下轧辊轴承弹流润滑数学模型,利用压力求解的多重网格法及弹性变形的多重网格积分法数值模拟了连续三角形周期脉冲载荷作用下乳化液润滑膜压力及膜厚的分布,分析了三角形周期脉冲载荷作用下润滑膜中心压力、中心膜厚及最小膜厚随时间变化的特性。计算结果表明,润滑膜中心压力的变化周期同脉冲周期一致,中心膜厚的变化滞后于脉冲和中心压力的变化;随三角形周期脉冲幅值的增大,中心压力和中心膜厚的振幅均增大,周期脉冲幅值越大,中心压力值越大,中心膜厚上下波动越大;当周期脉冲脉宽变大时,中心压力和中心膜厚的波动脉宽也变大,0.03 s后的中心膜厚上下波动范围变化微小。
A mathematical model is built for elastohydrodynamic lubrication of roll neck bearings under triangle periodic pulse load. The distribution of lubricating film pressure and film thickness of emulsion under continuous triangle periodic pulse load is simulated by using the multi- grid method for pressure and the multi- integration method for elastic deformation. The variation characteristics of central pressure,central film thickness and minimum film thickness with time are analyzed. The numerical results reveal that the variation period of central pressure of lubricating film is in accord with the pulse period,but the variation of the central film thickness lags behind the variations of the pulse and the central pressure. With the increase of the triangle periodic pulse amplitude,the amplitudes of the central pressure and central film thickness increase,and the higher the value of periodic pulse amplitude,the higher the value of central pressure,the larger the fluctuation of the value of central film thickness. With the increase of the periodic pulse width,the fluctuating pulse width of central pressure and central film thickness become larger,the variation of fluctuation range of central film thickness is small after 0. 03 s.
A mathematical model is built for elastohydrodynamic lubrication of roll neck bearings under triangle periodic pulse load. The distribution of lubricating film pressure and film thickness of emulsion under continuous triangle periodic pulse load is simulated by using the multi- grid method for pressure and the multi- integration method for elastic deformation. The variation characteristics of central pressure,central film thickness and minimum film thickness with time are analyzed. The numerical results reveal that the variation period of central pressure of lubricating film is in accord with the pulse period,but the variation of the central film thickness lags behind the variations of the pulse and the central pressure. With the increase of the triangle periodic pulse amplitude,the amplitudes of the central pressure and central film thickness increase,and the higher the value of periodic pulse amplitude,the higher the value of central pressure,the larger the fluctuation of the value of central film thickness. With the increase of the periodic pulse width,the fluctuating pulse width of central pressure and central film thickness become larger,the variation of fluctuation range of central film thickness is small after 0. 03 s.
引文
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[3]刘本海,王优强.乳化液润滑复合塑料轴承的弹流润滑分析[J].润滑与密封,2009(3):36-40.
[4]Yang Pei-ran,Wen Shi-zhu.A Generalized Reynolds Equation for Non-Newtonian Thermal Elastohydrodynamic Lubrication[J].ASME Journal of Tribology,1990,112:631-636.
[5]Dowson D,Higginson G R.Elasto-Hydrodynamic Lubrication[M].London:Pergamon Press,1977.
[6]Roelands C J A.Correlation Aspects of Viscosity-Temperature-Pressure Relationship of Lubricating Oils[D].Netherlands:Delft University of Technology,1966.
[7]王家序,余江波,田凡,等.水润滑塑料合金轴承数值分析的多重网格法[J].润滑与密封,2005,30(4):62-64.