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对微型转子(半径为19.85mm)动态特性进行了数值模拟和实验研究。在数值模拟中,利用ANSYS对空气轴承-微转子系统进行了双向瞬态流固耦合研究;模拟了启动阶段转子在空气轴承调节下的运动过程。结果表明:转子的动态过程为一运动幅度逐渐减小的振荡过程,最后将稳定于某一平衡位置;在轴承供压越大时,转子运动幅度越大,且达到稳定所需时间更长。计算结果发现了轴承间隙宽度与轴承流量的正相关关系。在对应实验中,实验结果与模拟结果很好的相符。由数值模拟和实验研究,说明了在较大止推轴承供压下由于转子轴向运动幅度大,有更大发生碰撞的风险;而在70 927Pa的供压下进行启动则更为合适。
The micro-rotor (radius of 19.85mm) dynamic characteristics of a numerical simulation and experimental study. In the numerical simulation, the air-bearing-micro-rotor system was studied by the two-way transient fluid-solid coupling using ANSYS. The rotor movement under the air bearing adjustment was simulated. The results show that the dynamic process of the rotor is an oscillating process with decreasing amplitude of motion, and finally stabilizes at a certain equilibrium position. When the bearing pressure is increased, the rotor’s motion amplitude is larger and the time required to achieve stability is longer. The calculated results show a positive correlation between bearing clearance and bearing flow. In the corresponding experiments, the experimental results are in good agreement with the simulation results. Numerical simulations and experimental studies show that there is a greater risk of collisions due to the large axial movement of the rotor due to the larger thrust bearing pressure supply. However, it is more appropriate to start with a supply pressure of 70 927 Pa.