An experimental study is performed to investigate the frequency effects of the excitation force on the linear stiffness and damping coefficients of a LOP (load on pad) type five-pad tilting pad journal bearing with the diameter of 300.91 mm andthe 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) excitationfrequency ratio in the x-axis direction v{sub}x = 0.5, 2) excitation frequency ratio in they-axis direction v{sub}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 duringthe 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 variationof 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 dampingcoefficients 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 increasewith the bearing load.
展开▼
机译：进行了实验研究，以研究激振力对LOP（垫载荷）型五垫倾斜垫轴颈轴承的线性刚度和阻尼系数的频率影响，直径为300.91 mm，长度为149.80 mm。在当前工作中，感兴趣的主要参数是激发测试轴承振动的频率。使用正交安装的液压激励器，可以独立地控制激励频率，如下所示：1）x轴方向上的激励频率比v {sub} x = 0.5，2）轴向上的激励频率比v {sub} y = 0.6、0.7、0.8、0.9。控制激励力的大小以确保测试轴承在测试过程中具有线性行为。轴承和轴之间的相对运动以及轴承箱的加速度是使用不同的轴承载荷和轴速度值作为激励频率的函数进行测量的。测量表明，激励频率的变化对刚度和阻尼系数影响很小。五板可倾瓦块轴颈轴承的刚度系数随着激励频率比的增加而略有降低，而阻尼系数随激励频率比的增加而略有增加，特别是在较低速度和较高负载的情况下。轴承载荷方向的直接刚度和阻尼系数均随轴速度的增加而减小，但随轴承载荷的增加而增大。
展开▼
