Study on vibration characteristics of the guide vane stem-head cover coupled system using substructure modal synthesis method

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (12) : 80-89.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Study on vibration characteristics of the guide vane stem-head cover coupled system using substructure modal synthesis method

WANG Yang1，LIANG Quanwei2，MA Tongwu1，ZENG Jin*1,3，HE Qiyuan2，YANG Yang1，WANG Shijian2#br#

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Abstract

Aiming at the rubbing fault between guide vane stem and head cover of a francis hydro-turbine under the effect of water flow, the finite element method combined with the fixed interface mode synthesis method was used to establish the reduced model of the guide vane stem-head cover system with rubbing fault. Then the effects of truncation number of guide vane stem and head cover on the first three-order natural frequencies of the model were discussed, respectively. Next, considering the pre-stressed effect caused by the water flow load and the local contact load between guide vane stem and head cover, the first three order natural frequencies obtained from the full and reduced models varying with hydrostatic load and friction coefficient were compared with each other. Finally, the effects of two contact states including near and near-far load end contacts on the dynamic behavior of the full and reduced models under single harmonic water flow excitation were compared with each other. The results showed that: (1) the first three natural frequencies of the system increase with the increasing hydrostatic load leading to the aggravation of local contact between guide vane stem and head cover, and a larger friction coefficient results in a larger hydrostatic load when switching from near-load end contact to near-far load end contact; (2) in the resonant state, the frequency spectrogram of guide vane stem-head cover rubbing-coupled system under the effect of single harmonic water flow presents integer multiples of the excitation frequency, and the amplitude amplification phenomenon appears at odd harmonics of the excitation frequency.

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francis hydro-turbine / rubbing / model reduction / dynamic characteristics

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WANG Yang1, LIANG Quanwei2, MA Tongwu1, ZENG Jin1, 3, HE Qiyuan2, YANG Yang1, WANG Shijian2. Study on vibration characteristics of the guide vane stem-head cover coupled system using substructure modal synthesis method[J]. Journal of Vibration and Shock, 2025, 44(12): 80-89

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