环槽阶梯轴承系统瞬态响应分析研究

Analyzing transient response of round and stepped recess bearing systems

为了研究润滑介质、转子和轴瓦之间的相互作用,探讨了一种用于超高速主轴的环槽阶梯滑动轴承系统对摩擦学性能的影响.分析了该轴承系统对受到不同形式外载荷时的瞬态响应特性,采用一种融合计算流体动力学和流固耦合的瞬态分析方法对该轴承系统完整模型进行数值分析,同时采用基于压力的相变条件研究润滑介质的空化现象.对一个润滑速度场可视化实验轴承系统和一个文献中的轴承系统进行分析,实验结果验证了该瞬态耦合分析方法的正确性,通过对环槽阶梯轴承系统从静止启动到稳定运转这一瞬态工作过程进行分析,获得了外载荷的形式和大小、转速及进水压力对轴承系统润滑特性和轴颈轨迹的影响规律.

The tribological behavior and transient respones of a round and stepped recess sliding bear- ing used in high-speed spindles was studied. A transient analysis method based on computational fluid dynamics and fluid-structure interaction was presented. Phase changing condition based on pressure was adopted to analyze the cavitations of lubricating fluid. An experimental bearing system of a lubri- cation velocity field visualization and another in the literature were analyzed. The correctness of the transient coupled analysis was verified. After analyzing the round and stepped recess bearing system in the transient process from a static start to stable operation, the influence law of load form and size, speed, inlet pressure on bearing system lubrication characteristics and journal trajectory were ob- tained.