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建立了径向轴承在载荷和速度突然变化时的三维数学模型 ,模型中考虑了轴瓦的热变形 ,在油膜和轴瓦交界面采用热流连续的理想边界条件 ,数值模拟轴承的瞬态温度场 ,并对轴承的瞬态性能进行分析。在每一瞬时 ,用 Newton-Raphson算法同时求解 Reynolds方程、膜厚方程和轴颈运动方程获得轴承油膜的压力分布和轴颈中心的运动速度 ,然后数值积分压力分布得到轴承的油膜力 ,差分运动速度得到轴颈中心位置和运动加速度。用一有效的有限差分法同时求解油膜和轴瓦的温度控制方程。最后将 Reynolds方程和能量方程通过节点压力和温度相耦合获得轴承的瞬态三维温度场。结果表明本文所介绍的方法收敛快 ,大大节约计算时间。
A three-dimensional mathematical model of radial bearing with sudden changes in load and speed is established. The model takes into account the thermal deformation of the bearing. The ideal boundary conditions of continuous heat flow are used to simulate the transient temperature field of the bearing. The transient performance of the bearing is analyzed. At each instant, the Newton-Raphson algorithm is used to solve the Reynolds equation, the film thickness equation and the journal motion equations simultaneously to get the pressure distribution of the bearing oil film and the center of the journal. Then the numerical integral pressure distribution can obtain the oil film force and differential motion The center of the journal and the acceleration of the movement are obtained. Simultaneous Calculation of Temperature Control Equations of Oil Film and Bearing Bush by an Effective Finite Difference Method. Finally, the Reynolds equation and the energy equation are obtained by coupling the node pressure and temperature to obtain the transient three-dimensional temperature field of the bearing. The results show that the method described in this paper converges fast, saving a lot of computational time.