转子系统局部热弯曲两种建模方式比较

Comparison of Two Modeling Methods for Rotor System with Local Thermal Bending

局部热弯曲的转子系统建模方式有二维方法和三维方法两种,但两种方法的比较、适用范围的分析等尚未见报道.因此结合热传导学和转子动力学理论对局部热弯曲转子系统建模的两种方法进行详细阐述,并通过分析实际转子系统的热场、热变形、热弯曲振动,对两种建模方式的效率和精度进行分析和比较.研究结果表明:二维热场分析方法精度低但计算效率高,适用于输入热量集中的情况;三维热场分析方法精度高但计算效率低,适用于输入热量分散的情况.

Both 2D and 3D methods can be used for modeling a rotor system with local thermal bending,but comparisons of the two methods and their applications are still not reported.The two methods were discussed in detail based on heat transfer and rotor dynamics theories in rotor system with local thermal bending.The efficiency and accuracy of the two methods were compared through analyses of thermal field,thermal deflection and thermal bending vibration of an actual rotor system.The results show that the 2D thermal field analysis has lower accuracy but higher computational efficiency,which is suitable for concentrated heat input,while the 3D method has higher accuracy but lower computational efficiency,which is suitable for dispersed heat input.