橡胶轴承黏弹性和振动载荷耦合润滑特性研究

基于橡胶材料黏弹性,建立综合时变效应的无限长线接触轴承润滑模型。基于三参量固体蠕变模型,并耦合振动载荷对橡胶轴承进行了弹流润滑分析。计算并分析了3种振动载荷形势下,橡胶轴承润滑膜的最大压力和最小膜厚变化,并与不考虑蠕变影响的情况进行了对比。探讨了相同载荷、不同时刻下,橡胶轴承润滑膜压力和膜厚的变化。压力的求解采用了多重网格法,为了提高收敛精度,其底层采用了牛顿迭代,求解弹性变形采用了多重网格积分法。结果表明,在计入橡胶轴承的黏弹性时,润滑膜压力在随着振动载荷做同等形式振动的同时,在蠕变开始阶段,压力会取得较大的值,且随着运行时间的延长,整体下降并趋于稳定;相反,润滑膜厚度在随载荷做相反形式振动的同时,在开始阶段,膜厚会取得较小的值,且随着运行时间的延长,整体增大并趋于稳定;相同载荷下,随着时间的延长,承载区变大,润滑膜压力减小,膜厚变大。

Study on Lubrication Characteristic of Rubber Bearing based on Viscoelasticity and Vibrative Load

Based on the viscoelasticity of rubber bearing material, an infinite line contact bearing lubri cation model with transient effects is established. Based on three-parameter solid creep model and coupled vi bration load, the elastohydrodynamic lubrication analysis of rubber bearings is carried out. The maximum pressure and minimum film thickness of the rubber bearing lubricant film under three load vibration situations are calculated and analyzed, compared with the case that the creep effect is not considered. The changes of lu brication film pressure and film thickness of rubber bearing under the same load and different time are dis cussed. The multigrid method is adopted to solve the pressure, Newton iteration is adopted to solve the bottom layer and multigrid integral method is adopted to solve the elastic deformation in order to improve the conver gence accuracy. The results show that when the viscoelasticity of the rubber bearing is taken into account, the pressure of the lubricant film vibrates in the same form as the load vibration. The pressure will reach a larger value at the beginning of the creep and the whole pressure profile declines to stability with the running time in creases. The thickness of the lubricant film vibrates in the opposite form with the load vibration. The film thickness will take a smaller value at the beginning, the overall increases and tends to be stable with the run ning time increases. The supporting region becomes larger over time under the same load, the pressure profile of the lubricant film decreases and the film thickness becomes thicker.