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Abstract
3D whole engine finite element model of a low pressure rotor rig test model is established in this paper. Rotorynamic characteristics are mainly analysed with three models, which include rotor model with static stiffness, rotor model with dynamic stiffness, and whole engine model. The calculation results were compared and discussed deeply. Rotordynamic characteristics of rotor model with static stiffness are similar with the rotor model with dynamic stiffness, but the latter may have additional resonance peaks caused by dynamic stiffness. Whole engine model, which can capture the modes of casing and coupling vibration between stator and rotor, may have more critical speeds than rotor model only. The unbalance response amplitude and phase angle of the whole engine model are different with the only rotor model, in the values and distributions of the peaks. The result of rotor model with dynamic stiffness is closed to the whole engine model than the rotor model with static stiffness. The peak values of the whole engine model are smaller than the only rotor model. Rotordynamic characteristics with whole engine model are more accurate than rotor model only, so it necessary to analyse rotordynamic characteristics with whole engine model in detail design stage.
Highlights
Finite element Aero-engine rotordynamic model usually does not include detailed casing model
While the critical speeds predicted by the three models are comparable, the critical speeds based on the rotor model with dynamic stiffness are closer to the whole engine model than the rotor model with static stiffness, since the dynamic stiffness is dynamically more representative of the whole engine model
We can see that the results based on the standalone rotor models are similar, while the rotor model with dynamic stiffness has an additional peak induced by the stator casing model
Summary
Finite element Aero-engine rotordynamic model usually does not include detailed casing model. 3D finite element model of an aero-engine low pressure rotor rig test system is established. The 3D whole engine finite element model of a low pressure rotor rig test model is shown, which includes the casing and the rotor. The rotor is supported by 3 bearings Both the rotor and casing are modelled using SOLID185 elements. The COMBI214 elements are used to modelling bearings and supports, which connect the rotor to the casing. The global vibration mode shapes of the whole engine are shown, including coupling modes between the rotor and the casing. Modes of engine (c) mode 3 (frequency ratio 0.731)
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