Excitation Frequency Effects on the Stiffness and Damping Coefficients of a Five-Pad Tilting Pad Journal Bearing
Excitation Frequency Effects on the Stiffness and Damping Coefficients of a Five-Pad Tilting Pad Journal Bearing
复制标题
激励频率对五瓦可倾瓦轴颈轴承刚度和阻尼系数的影响
DOI：
10.1115/1.2834098
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
S. Yang
中科院分区：
文献类型：
--
作者：
H. Ha;S. Yang
对直径为300.91 mm、长度为149.80 mm的LOP（load on pad）五瓦可倾瓦滑动轴承进行了激振力频率对轴承线性刚度和阻尼系数影响的实验研究。使用正交安装的液压激励器独立控制激励频率，如下所示：1）x轴方向上的激励频率比ν x = 0.5，2）y轴方向上的激励频率比ν y = 0.6，0.7，0.8，0.9。控制激振力的大小以确保测试轴承在测试期间具有线性行为。轴承和轴之间的相对运动，以及轴承箱的加速度作为激励频率的函数，使用不同的轴承载荷和轴转速的值进行测量。试验结果表明，激振频率的变化对结构的刚度和阻尼系数影响不大。五瓦可倾瓦滑动轴承的刚度系数随激振频率比的增大而略有减小，阻尼系数随激振频率比的增大而略有增大，特别是在低速高载情况下。轴承载荷方向的直接刚度系数和阻尼系数均随转速的增加而减小，随轴承载荷的增加而增大。
An experimental study is performed to investigate the frequency effects of the excitation force on the linear stiffness and damping coefficients of LOP (load on pad) type five-pad tilting pad journal bearing with the diameter of 300.91 mm and the length of 149.80 mm. The main parameter of interest in the present work is excitation frequency to shake the test bearing. The excitation frequency is controlled independently, using orthogonally mounted hydraulic exciters, as follows: 1) excitation frequency ratio in the x-axis direction ν x = 0.5, 2) excitation frequency ratio in the y-axis direction ν y = 0.6, 0.7, 0.8, 0.9. The magnitude of the excitation force is controlled to make sure that the test bearing has a linear behavior during the test. The relative movement between the bearing and shaft, and the acceleration of the bearing casing are measured as a function of excitation frequency using the different values of bearing load and shaft speed. Measurements show that the variation of excitation frequency has quite a little effect on both stiffness and damping coefficients. The stiffness coefficients of the five-pad tilting pad journal bearing slightly decrease as the excitation frequency ratio increases, while the damping coefficients slightly increase with excitation frequency ratio, especially in the case of lower speed and higher load. Both direct stiffness and damping coefficients in the direction of bearing load decrease with an increase of shaft speed, but increase with the bearing load.