Test Technology for High-cycle Vibration Fatigue Performance of Turbine Rotor Blades

LIN Guiyao; SHA Yundong; DING Wei; LUO Li

doi:10.7643/issn.1672-9242.2026.09.009

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (9) : 82-92. DOI: 10.7643/issn.1672-9242.2026.09.009

Special Topic—Structural Dynamics of Aviation Equipment

Test Technology for High-cycle Vibration Fatigue Performance of Turbine Rotor Blades

LIN Guiyao, SHA Yundong^*, DING Wei, LUO Li

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Abstract

The work aims to investigate the vibration fatigue failure of turbine blades of a certain aero-engine under the second-order natural frequency (first torsional mode), and conduct investigations on vibration characteristic analysis and test methodology under the second-order modal condition. Resonance frequencies of the blade were identified via frequency sweep tests. A finite element model of the blade was established for modal analysis to acquire multi-order modal frequencies and mode shapes, whose results were verified against experimental data to determine the second-order natural frequency of the blade. The influence law of clamping preload on blade frequency was obtained through torsion gradient tests. The mounting orientation of laser displacement sensors was optimized according to the vibration displacement direction of the target mode shape. Synchronous measurement of blade dynamic stress and blade tip vibration displacement was adopted to realize vibration stress calibration. The first two natural frequencies measured by frequency sweep tests were in good agreement with finite element simulation results; the simulation further yielded the first six orders of modal frequencies and corresponding mode shapes. The vibration stress (σ) of the blade presents a linear correlation with its natural frequency (f) and vibration amplitude (a). The theoretically calculated and experimentally measured vibration characteristics of the blade are consistent. The quantitative relationship between vibration stress under the second-order natural frequency (first torsional mode) and the blade's natural frequency as well as amplitude is established. The proposed test method is verified effective and can provide fundamental fatigue test data for the researched turbine blade.

Key words

turbine rotor blade / vibration characteristics / high-cycle fatigue / vibration stress calibration

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LIN Guiyao, SHA Yundong, DING Wei, LUO Li. Test Technology for High-cycle Vibration Fatigue Performance of Turbine Rotor Blades[J]. Equipment Environmental Engineering. 2026, 23(9): 82-92 https://doi.org/10.7643/issn.1672-9242.2026.09.009

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