Abstract The study of rotating machines stands out in the context of systems and structures due to the significant number of typical phenomena that may be present during the operation of such equipment. Rotating systems play an important role in industrial environments, with a wide range of application, namely, pumps, turbines, generators and compressors, and turbochargers, among others. Given this context, tilting pad journal bearings (TPJBs) can offer considerable stability to the rotor system due to its damping and stiffness characteristics, especially under high rotation speeds, whereas journal bearings with a fixed geometry may be subjected to fluid-induced instability. Consequently, thermal effects are significant in rotating machines to evaluate the behavior of hydrodynamic bearings due to the increase in shear effects in the lubricant caused by the rotation speed, leading to excessive temperature increase under specific operational conditions and, therefore, significant changes in lubricant viscosity. These effects may influence the dynamic characteristics of bearings, affecting the dynamic response of the entire system. From this perspective, a specific test rig was designed to perform the characteristic uncoupled motion of the shaft when supported by this kind of bearing. Experimental tests were directly compared with numerical models, showing promising results. In addition, the thermohydrodynamic (THD) lubrication was numerically solved by a finite volume method, considering an approach for a 3D THD model and the pivot flexibility.

中文翻译：

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可倾瓦滑动轴承 THD 润滑的 3D 方法——理论与实验

摘要 由于在此类设备的运行过程中可能存在大量典型现象，因此在系统和结构的背景下，旋转机械的研究脱颖而出。旋转系统在工业环境中发挥着重要作用，应用范围广泛，即泵、涡轮机、发电机和压缩机以及涡轮增压器等。鉴于这种情况，可倾瓦轴颈轴承 (TPJB) 由于其阻尼和刚度特性可以为转子系统提供相当大的稳定性，尤其是在高转速下，而具有固定几何形状的轴颈轴承可能会受到流体引起的不稳定性。最后，热效应在旋转机器中很重要，以评估流体动力轴承的行为，因为转速引起润滑剂中剪切效应的增加，导致特定操作条件下温度过度升高，因此润滑剂粘度发生显着变化。这些影响可能会影响轴承的动态特性，影响整个系统的动态响应。从这个角度来看，设计了一个特定的测试台来执行由这种轴承支撑的轴的特征性非耦合运动。实验测试直接与数值模型进行了比较，显示出有希望的结果。此外，热流体力学 (THD) 润滑通过有限体积法进行数值求解，