建立了某涡轮盘片结构的有限元模型, 通过对其进行热分析获得了该结构的稳态温度场。然后分别分析了非旋转状态与旋转状态下稳态温度场对盘片结构耦合振动的影响, 并与忽略温度影响的情况进行了对比。结果表明, 忽略温度影响的盘片结构耦合振动第一阶静频和动频误差均已超过10%, 对于以叶片振动为主的振动模态, 频率误差是第一阶的2～3倍。由于温度的影响使得盘片结构固有频率降低, 相同倍频的激振力, 在温度场作用下会激起更多阶的共振。因此在分析盘片结构耦合振动特性时, 温度的影响是不应当被忽略的。
This paper first establishes a finite element model of a turbine blade-disk structure, and obtains its steady-state temperature field by performing thermal analysis of the model.Then, effects of the temperature field on coupled vibration of the blade-disk structure under non-rotating and rotating conditions are analyzed respectively, andthe results are compared with those obtained without considering the temperature effects.Analysis results show that if the effect of temperature field is neglected, the static and dynamic frequency errors for the first mode vibration of the coupled blade-disk structure will be over 10%.For the modes where the blade vibration dominates, the frequency errors are 2 to 3 times higher than that of the first mode.Because the inherent frequencies of the blade-disk structure become lower due to the temperature field effects, the exciting forces of the same multiplication frequency can actually excite more orders of resonance.So the temperature field effects should not be ignored when analyzing coupled vibrations of turbine blade-disk structures.
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