Measurement of the Dynamic Characteristics of a Large Sleeve Bearing
Measurement of the Dynamic Characteristics of a Large Sleeve Bearing
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大型套筒轴承动态特性的测量
DOI：
10.1115/1.3451502
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发表时间：
1971
期刊：
影响因子：
--
通讯作者：
P. G. Morton
中科院分区：
文献类型：
--
作者：
P. G. Morton
流体润滑轴承对任何转子系统的不稳定涡动和“临界转速”的贡献可以用一定的线性化系数表示。这些系数中最重要的是与轴颈相对于轴承衬套的垂直和水平平移有关的系数。在流体动力润滑轴承的这八个系数的理论推导方面已经做了很多工作，但是在大型涡轮型轴承的情况下，还没有发表关于它们的直接实验测定的工作。本文介绍了一种能够测量28英寸以下轴承动态油膜特性的试验台的设计和操作。直径运行速度高达4000转/分。在一个20英寸的在层流状态下运行的直径轴承与计算系数进行了比较。理论和实验系数被用来预测几个大型汽轮发电机转子的动态特性下运行的测试条件下的轴承相似的几何形状。结果表明，基于当前理论的预测大大低估了稳定性和高估了测试轴承的刚度。
The contribution of fluid lubricated bearings to the unstable whirl and “critical speeds” of any rotor system can be expressed in terms of certain linearized coefficients. The most important of these coefficients are those relating to vertical and horizontal translation of the journal relative to the bearing bush. Much work has been done on the theoretical derivation of these eight coefficients for hydrodynamically lubricated bearings, but there has been no published work on their direct experimental determination in the case of large turbo-type bearings. The paper describes the design and operation of a rig capable of measuring the dynamic oil film characteristics for bearings up to 28 in. dia running at speeds up to 4000 rpm. Coefficients measured on a 20-in.-dia bearing running in the laminar regime are compared with computed coefficients. Both theoretical and experimental coefficients are used to predict the dynamic characteristics of several large turbogenerator rotors running under test conditions on bearings of similar geometry. It is shown that predictions based on current theory considerably underestimate the stability and overestimate the stiffness of the test bearing.