油膜轴承传动轴系动载系数计算方法

针对传动轴系动载荷变化难以准确用数学函数描述的问题，基于刚体动力学理论，综合考虑轴系刚性与弹性振动特性，提出近似求解动载荷的分析方法，建立轴系动载荷分析模型。通过分析现有油膜轴承试验装置中传动轴系的机械结构组成，推导传动轴系在启制动工况突变时的动载系数计算公式；根据传动轴系的结构参数，确定动载系数取值范围；同时给出该动载系数模型在工程应用中的典型形式。计算表明：轴系在启制动之前，相比没有静压润滑的情况，使用静压润滑的油膜轴承的动载系数相对较小，振动对其油膜稳定性的影响较小。

Calculation Method for Dynamic Load Coefficients of Drive Shafts of Oil-film Bearing

Aimed at the problem that it is difficult to use accurately mathematical functions to deal with the dynamic load changes of drive shafts, the analysis method of approximate solution for dynamic load was proposed based on the theory of rigid body dynamics and by considering the rigid and elastic vibration features, and a mathematical model of dynamic load analysis of shafts was established.By analyzing the mechanical structure of drive shafts for existing oil-film bearing testing device, the formula of dynamic load coefficients was deduced under the conditions of start-up and braking mutation of drive shafts.The numerical range of shaft dynamic load coefficients was determined according to the structural parameters of drive shafts, and some typical forms of dynamic load coefficients in actual engineering applications were given.The results show that, compared with those without hydrostatic oil pressure, the dynamic load coefficients of hydrostatic dynamic oil-film bearing with hydrostatic oil pressure are smaller before start-up and stop of shafts, and the influence of vibration on the stability of oil film is also smaller.