Noise measurement and analysis on the travelling wave resonance of aero-engine accessory gears

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (22) : 210-215.

HE Liuhai WU Guijiao WANG Ping WU Changyao

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Abstract

Aero-engine accessory gears could be damaged in the form of block fracture due to traveling-wave resonance. Considering the features of high speed, complicated measuring environment and low SNR, a measurement method for traveling-wave resonance was proposed. Acoustic sensors were placed to measure the mechanical noise of accessory gears exported from the inside of an accessory gearbox in the form of plane wave by using an acoustic catheter. Then the time-frequency analysis of signals was carried out to achieve the traveling wave resonance speed, its frequency and the excitation source of gears. The maximum error is 3.75%, compared with the result of the finite element calculation, which verifies the accuracy of the method. The experimental results of gears under different boundary conditions were compared. The results show that the boundary conditions have little effect on the high-order traveling wave frequency. The study provides a simple and effective means for the aero-engine gear design and troubleshooting.

Key words

aero-engine / accessory gear / travelling wave / acoustic waveguide

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HE Liuhai WU Guijiao WANG Ping WU Changyao. Noise measurement and analysis on the travelling wave resonance of aero-engine accessory gears[J]. Journal of Vibration and Shock, 2019, 38(22): 210-215

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