航空发动机数字孪生驱动的高精度摩擦电轴承传感器

doi:10.7527/S1000-6893.2023.29516

Abstract

Abstract:

The problems of the skidding damage in aeroengine bearings and the stability in retaining cageoperation are bottlenecks that restrict the reliable service of domestic aircraft equipment. To achieve the acquisition of multiple physical parameters for the digital twin of aviation， a high-precision bearing cage sensor based on triboelectric nanogenerator has been developed to monitor the skidding and the stability of cage rotation of aero engine bearing. Based on the integral cage， a non-contact floating freestanding modetriboelectric nanogenerator is composed of a dielectric ring with array protrusions fixed on the side surface of the retainer and a interdigital electrode plate installed on the bearing house. As the raceway driving the rolling element and the rolling element driving the cage， the dielectric ring sweeps the electrode to output an alternating current. The frequency characteristics of electrical signals can be used as indicators to evaluate bearing skidding and cage rotation stability. The effect of axial load， inner ring speed and other working conditions on bearing skidding， as well as the effect of structural parameters such as dielectric ring material and internal clearance of the generator on the output of the cage sensor has been investigated. The experimental results indicate that the increase in axial load leads to a significant decrease in bearing skidding rate under high speed conditions. The dielectric ring output performance of polytetrafluoroethylene material has been improved by more than 50% compared to other polymer materials. Moreover， the proposed bearing cage sensor was applied to the main bearing of a dual rotor aero engine test bench， achieving the skidding monitoring at high speeds （5 900 r/min）. This study provides a technical reference for the intelligent design of rolling bearings， which is expected to be extended from the virtual real interaction of intelligent component twin monomers to the twin form of overall components in aviation engines. And the optimization ideas of this research field in future aero engine digital twin technology has been discussed.

Key words: triboelectric nanogenerator, aero engine bearing, skidding, digital twin, cage

CLC Number:

Shuai GAO, Qinkai HAN, Fulei CHU. High precision triboelectric bearing sensor driven by digital twin of aero engine[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(21): 629516.

Figures/Tables 19

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High precision triboelectric bearing sensor driven by digital twin of aero engine

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