The inter-shaft bearings are important supporting parts between higher and lower pressure rotors in dual-rotor systems, it is essential to analyze their temperatures during operation. This paper concentrates on the effect of the dynamics of the system on the temperatures of bearings, namely, the dynamic load is coupled with thermal behaviours. The dynamic load of the inter-shaft bearing is obtained by solving the dynamic equations of the system numerically. The friction heat generations (FHGs) under the dynamic load are obtained by Palmgren’s empirical formula, based on which, the unsteady-state heat balance equations under the dynamic load are proposed considering the viscosity-temperature relationship of the lubricant. The steady-state and unsteady-state temperatures analysis of the inter-shaft bearing are carried out afterwards. The results show that the temperature of the inter-shaft bearing and the total FHG increase sharply and form two peaks in the “resonance zone” of the dual-rotor system, and gradually increase in the “non-resonance zone” of the system. The steady-state temperature of lower rotation speed in the “resonance zone” may be much higher than that of higher rotation speed in the “non-resonance zone”. The load FHG plays a leading role in the “resonance zone”, while the viscosity FHG plays a leading role in the “non-resonance zone”.

轴间轴承是双转子系统中高压和低压转子之间的重要支撑部件，在运行过程中对其温度进行分析至关重要。本文重点研究系统动力学对轴承温度的影响，即动态载荷与热行为相关联。轴间轴承的动载荷是通过对系统的动力学方程进行数值求解得到的。动载荷下的摩擦生热(FHGs)由Palmgren经验公式求得，在此基础上，考虑润滑油的粘温关系，提出动载荷下的非稳态热平衡方程。随后进行轴间轴承的稳态和非稳态温度分析。结果表明，轴间轴承温度和总FHG温度急剧升高，在双转子系统的“共振区”形成两个峰值，并在系统的“非共振区”逐渐升高。“共振区”较低转速的稳态温度可能远高于“非共振区”较高转速的稳态温度。载荷FHG在“共振区”中起主导作用，而粘度FHG在“非共振区”中起主导作用。“共振区”较低转速的稳态温度可能远高于“非共振区”较高转速的稳态温度。载荷FHG在“共振区”中起主导作用，而粘度FHG在“非共振区”中起主导作用。“共振区”较低转速的稳态温度可能远高于“非共振区”较高转速的稳态温度。载荷FHG在“共振区”中起主导作用，而粘度FHG在“非共振区”中起主导作用。