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Multi-Field Coupling Dynamics Modeling of Aerostatic Spindle

机译:空气静力学主轴多场耦合动力学建模

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摘要

The aerostatic spindle in the ultra-precision machine tool shows the complex multi-field coupling dynamics behavior under working condition. The numerical investigation helps to better understand the dynamic characteristics of the aerostatic spindle and improve its structure and performance with low cost. A multi-field coupling 5-DOF dynamics model for the aerostatic spindle is proposed in this paper, which considers the interaction between the air film, spindle shaft and the motor. The restoring force method is employed to deal with the times varying air film force, the transient Reynolds equation of the aerostatic journal bearing and the aerostatic thrust bearing is solved using ADI method and Thomas method. The transient air film pressure of aerostatic bearings is obtained which clearly presents the influence induced by the tilt motion of the spindle shaft. The motion trajectory of the spindle shaft is obtained which shows different stability of the shaft under different external forces. The dynamics model shows good performance on simulating the multi-field coupling behavior of the aerostatic spindle under external force. which is quite meaningful and useful for the further research on the dynamic characteristics of the aerostatic spindle.
机译:超精密机床中的空气静力学主轴显示了工作状态下复杂的多场耦合动力学行为。数值调查有助于更好地了解空气静力学的动态特性,并以低成本提高其结构和性能。本文提出了一种用于空气静力学主轴的多场耦合5-DOF动力学模型,其认为空气膜,主轴轴和电动机之间的相互作用。采用恢复力方法来处理变化的空气膜力的时间,使用ADI方法和托马斯方法解决了空气静态轴颈轴承的瞬态雷诺等式和空气施涡轴承。获得了空气膜的瞬态空气膜压力,其清楚地呈现由主轴轴的倾斜运动引起的影响。获得主轴轴的运动轨迹,其在不同的外力下表示轴的不同稳定性。动力学模型对模拟外力下的空气静力学的多场耦合行为进行了良好的性能。这对进一步研究了对空气静力学的动态特性进行了非常有意义的。

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