Thin-walled support structure responses of an engine under the-periodic impact excitation of bearings

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (2) : 72-78.

GENG Binbin1，ZUO Yanfei1，WANG Chen2，JIANG Zhinong2，HU Minghui3，HE Ya3

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Abstract

The bearing of an gas turbine engine runs out of work from time to time.However, the failure signals of the bearing are decayed and weakened seriously after being transmitted to the surface of the casing through a complicated thin-walled structure, which makes it rather difficult to analyze and diagnose the bearing failure by using its vibration signals.In order to solve this problem, the correlation between the periodic impact excitation and vibration responses in time-frequency domain was analyzed based on the analysis of the inherent characteristics of the thin-walled support system and the mechanism of bearing failure characteristics.Then, on this basis, the response characteristics of the complicated thin-walled support structure at measuring points were explained.The relevant conclusions provide worthy information for bearing fault diagnosis based on resonance demodulation, and have certain reference value for the fault early warning or diagnosis of gas turbine engine with thin-walled support structures.

Key words

thin-walled support structure / bearing failure / response mechanism / finite element analysis

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GENG Binbin1，ZUO Yanfei1，WANG Chen2，JIANG Zhinong2，HU Minghui3，HE Ya3. Thin-walled support structure responses of an engine under the-periodic impact excitation of bearings[J]. Journal of Vibration and Shock, 2020, 39(2): 72-78

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