Multi-modal coupled vibration characteristics of compressor blade under harmonic excitation
LI Xin1,CHEN Guanfeng1,QIN Xiuyun1,CHENG Qian1,PAN Rong1,2,WANG Chunjian1,ZHANG Chengbo3
1.AECC Sichuan Gas Turbine Research Institute,Chengdu 610500,China;
2.College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;
3.Tianjin Aerospace Reliability Technology Co.,Ltd.,Tianjin 300450,China
Abstract:During the fatigue test of compressor blades in an aviation engine on a vibration table, the high-order harmonic components appear when the harmonic excitation signal of the shaking table is transmitted through the friction interface of several tooling. When the natural frequency of the blade is close to the frequency of the high-order harmonic component of the excitation frequency, the blade will have multi-mode coupling vibration under external harmonic excitation which can be used to simulate the multi-order coupling vibration of aero-engine compressor blades. This article obtained the vibration characteristics of displacement and strain during blade coupled vibration through vibration fatigue multi-mode calibration tests and excitation tests. Numerical analysis and experimental results show that: a) the position of blade failure is consistent with the position of high stress after the superposition of coupled vibration modes; b) with the increase of frequency difference between blade natural frequency and higher-order harmonic component frequency, the vibration stress of higher-order modes decreases exponentially.
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