Test study on dynamic characteristics of rotor with fuse structure under FBO excitation

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (3) : 301-308.

ROTDYN2024

Test study on dynamic characteristics of rotor with fuse structure under FBO excitation

CHU Wennan, HE Zekan*, XUAN Haijun

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Abstract

To research the dynamic response characteristics of the rotor system with fusing structure under Fan Blade Off (FBO), a reduced-scale simulated rotor with the same span ratio and similar dynamic characteristics as the low pressure rotor of an actual high bypass ratio turbofan engine was designed based on the similarity theory. A cone fusing structure with thinning section and weakening holes was designed, and its failure threshold range was determined by finite element analysis. The dynamic characteristics of the rotor with fusing structure failure under FBO were studied on the horizontal high-speed rotating test platform. Research shows that the first and second order critical speed values of the simulated rotor decrease by 30.4% and 3.0% respectively after the failure of the fusing structure. Compared with the peak response data of FBO, the shock vibration response of 2# bearing seat and front support is more sensitive to the failure of fusing structure. The vibration response of the 5# bearing seat is approximately sensitive to the first and second critical speed when the rotor speed is reduced, and a large part of the unbalanced load of the rotor is transferred to the outside through the 2# support.

Key words

FBO / fusing structure / shock response / deceleration process / dynamic characteristics / experimental

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CHU Wennan, HE Zekan, XUAN Haijun. Test study on dynamic characteristics of rotor with fuse structure under FBO excitation[J]. Journal of Vibration and Shock, 2025, 44(3): 301-308

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