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.
ZHANG Ting-ting, WANG Ke-ming, LI Xiang, JING Xiao-dong
. Analysis of the effects of temperature field on coupled blade-disk vibration characteristics[J]. Journal of Shenyang Aerospace University, 2013
, 30(2)
: 13
-17
.
DOI: 10.3969/j.issn.2095-1248.2013.02.004
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