| Citation: | SHEN Xiangxiang, CHEN Guo, HU Wei, et al. Vibration prediction of aero-engine rotor based on tip clearance measurement[J]. Journal of Aerospace Power, 2022, 37（12）：2840-2850 doi: 10.13224/j.cnki.jasp.20220200
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Based on the measurement of tip clearance, the prediction method of aeroengine rotor vibration displacement and axis trajectory was studied. Based on the dynamic model of tip clearance change, the numerical calculation and finite element simulation of tip clearance change were carried out, and the experimental research was carried out for the rotor tester with casing. The tip clearance of two measuring points perpendicular to each other was measured by eddy current sensor. The signal was processed by Hilbert Huang transform to extract its low-frequency component. The cross-correlation analysis method was used to extract the frequency conversion signal, and the axis trajectory was drawn from the frequency conversion component. Compared with the direct measurement of the axis trajectory on the rotating shaft of the same section, the coincidence degree of these two was more than 90%. The test results fully showed the correctness and effectiveness of the research method, providing an effective technical way to indirectly obtain the rotor vibration displacement through the blade tip clearance test.
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