| Citation: | HUANG Xingrong, SUN He, WU Jian, et al. Analysis of resonant frequency shift phenomenon raised from dynamic strain measurement data of turbine blade in a turbofan engine[J]. Journal of Aerospace Power, 2022, 37（11）：2388-2397 doi: 10.13224/j.cnki.jasp.20220189
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A high-pressure turbine blade of a high thrust-to-weight ratio turbofan adopted edge plate damper design to reduce the vibration stress of the blade. During the core machine ground bench test, the frequency-domain characteristics of the strain test data showed drift phenomenon, and the vibration energy presented random feature in a narrow frequency band. The phenomenon was discussed and analyzed at first. Then the equivalent model of a single blade considering the influence of the edge plate damper was established according to test data. Based on the time integration method and the nonlinear modal theory, the response characteristics, friction characteristics, resonant frequency characteristics and friction damping characteristics of the system were calculated under different rotation speeds. The simulation results showed that the rotation speed fluctuation affected the frequency domain distribution characteristics of the vibration response and the resonant frequency range distribution of the system: at 11 713 r/min, the nonuple excitation order induced the resonance frequency band of 1 756—1 952 Hz, at 13 500 r/min, the octuple excitation order induced the resonance frequency around 1 800 Hz, and at 13 687 r/min, the octuple excitation order induced the resonance frequency band of 1 596—1 824 Hz. Under stable rotational speed, the dry friction force jumped alternatively between the maximum and minimum values, which reflected a friction damping effect and brought about unstable changes in the additional stiffness of the system. The nonlinear modal theory results showed that the modal frequency of the damped blade changed with the vibration response amplitude. The decrease of the blade stiffness or the increase of the friction force amplitude can enlarge the modal frequency range.
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