Optimization of Groove Geometry for Thrust Air Bearing to Maximize Bearing Stiffness
Optimization of Groove Geometry for Thrust Air Bearing to Maximize Bearing Stiffness
复制标题
DOI：
10.1115/1.2913546
复制
发表时间：
2008-07
影响因子：
2.5
通讯作者：
H. Hashimoto;M. Ochiai
中科院分区：
文献类型：
--
作者：
H. Hashimoto;M. Ochiai
流体动压气膜轴承广泛应用于超高速、轻载荷的旋转机械。在动压气膜轴承的设计中，提高气膜刚度是减小轴承振动的关键。在各种类型的动压气膜推力轴承中，沟槽轴承具有高刚度和承载能力的优点，但轴承的刚度强烈地依赖于沟槽的几何形状。因此，当槽的几何形状被适当地设计时，可以期望显著地改善轴承的稳定性特性。然而，传统的轴承几何形状是基于固定的对数螺旋曲线，并且没有关于如何有效地改变凹槽几何形状以大幅改善轴承特性的文献。本文提出了一种全新的优化设计方法，该方法利用样条函数灵活地改变槽型，以最大化槽型止推轴承气膜刚度。实验验证了该方法的有效性。
Hydrodynamic gas film bearings are widely used for very-high-speed, lightly loaded rotating machinery. In the design of hydrodynamic gas film bearings, it is of cardinal importance to enhance the stiffness of gas films to minimize vibration due to external excitations. Among various types of hydrodynamic gas film thrust bearings, grooved bearings have an advantage of high stiffness and load-carrying capacity, but the stiffness of the bearings strongly depends on groove geometry. Therefore, when the groove geometry is suitably designed, it is expected to considerably improve the stability characteristics of the bearings. However, conventional bearing geometries are based on a fixed logarithmic spiral curve, and there is no literature on how to effectively change the groove geometry to drastically improve the bearing characteristics. In this paper, the entirely new optimum design methodology, in which the groove geometry can be flexibly changed by using the spline function, is presented to maximize the stiffness of gas films for grooved thrust bearings. The effectiveness of the methodology is experimentally verified.