To analyze the nonlinear dynamics of a tilting-pad journal bearing (TPJB)-rotor system with high accuracy and speed, the database method (DM) is modified to rapidly determine the nonlinear fluid film force (NFFF) of a TPJB while considering turbulent and thermal effects. A high-accuracy, large-capacity NFFF database for a single pad is constructed by numerically solving the turbulent adiabatic hydrodynamic model for five equivalent state variables of the journal, which are discretized in the pad coordinates. The remaining variables are not discretized in the DM. A combined linear and parabolic interpolation polynomial based on the database is established to accurately calculate the NFFF of the tilting pads; thus, the NFFF of a four-pad TPJB is obtained in the bearing coordinates. The DM is applied to analyze and compare the nonlinear dynamic behavior of a water-lubricated TPJB-Jeffcott rotor system with and without turbulent and thermal effects. The present DM solution without these effects and the previous DM solution are shown to be consistent. The results demonstrate the importance of the flow regime and the negligibility of temperature increases in the nonlinear dynamics of a water-lubricated TPJB. This work contributes to the accurate and efficient analysis of the nonlinear dynamics of high-speed TPJBs and low-viscosity-fluid-lubricated TPJBs.

中文翻译：

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快速分析倾斜垫轴颈轴承-转子系统的湍流和热效应的非线性流体膜力和动力学特性

为了高精度和快速地分析斜垫轴颈轴承（TPJB）-转子系统的非线性动力学，修改了数据库方法（DM）以在考虑湍流和湍流的同时快速确定TPJB的非线性流体膜力（NFFF）。热效应。通过数值求解轴颈的五个等效状态变量的湍流绝热流体力学模型，可在单个垫块中建立高精度，大容量的NFFF数据库，这些变量在垫块坐标中离散化。其余变量在DM中不离散化。建立了基于数据库的线性和抛物线组合插值多项式，以准确计算倾斜垫的NFFF。因此，在方位坐标中获得了四垫板TPJB的NFFF。DM用于分析和比较带有或不带有湍流和热效应的水润滑TPJB-Jeffcott转子系统的非线性动力学行为。没有这些影响的当前DM解决方案和以前的DM解决方案被证明是一致的。结果表明，在水润滑的TPJB的非线性动力学中，流动状态的重要性和温度升高的可忽略性。这项工作有助于对高速TPJB和低粘度流体润滑TPJB的非线性动力学进行准确而有效的分析。结果表明，在水润滑的TPJB的非线性动力学中，流动状态的重要性和温度升高的可忽略性。这项工作有助于对高速TPJB和低粘度流体润滑TPJB的非线性动力学进行准确而有效的分析。结果表明，在水润滑的TPJB的非线性动力学中，流动状态的重要性和温度升高的可忽略性。这项工作有助于对高速TPJB和低粘度流体润滑TPJB的非线性动力学进行准确而有效的分析。