挤压膜悬浮导轨的悬浮特性研究

Research on the Characteristic of the Floating Guide Way with Squeeze Film

运用数值解法对自由悬浮体挤压膜悬浮导轨进行理论分析,其数值结果适用于各种大小的挤压数和激振振幅,与实验结果更加贴近。研究2种激振模式即刚体模态激振和弯曲波激振下的自由悬浮块数学模型,运用数值方法计算气膜特性,得到2种激励下的气膜特性。结果表明:采用弯曲波激振模式能得到更好的承载力和气膜稳定性;对于弯曲波激振模型,由于波传递的影响,悬浮体可能发生偏转或不稳定,可依靠提高频率和减小波幅值来提高悬浮精度,采用轴对称模型,或用2个波长以上的波支撑悬浮体来克服悬浮体的偏转。

The numerical results obtained by numerical analysis methods for floating guide-way with squeeze film which the floating object is free can apply to arbitrary squeeze number and driving amplitude,and is close to the results of experiments. The models of free object floating with two driving methods that is rigid mode driving and flexible wave driving were investigated. By calculating the properties of the film with numerical methods,the applicable condition and characteristics of the two kinds of driving modes were got. The results show that the flexible wave driving can obtain better carrying capacity and film stability. The suspended objects may rotate or are unstable for the flexible oscillation because of the transportation of the wave. By increasing the frequency and decreasing the amplitude of the wave,the suspended accuracy can be improved,by adopting the axial symmetry model and holding the suspended objects by more than two waves,the objects can be kept stable.