Modal analysis of mistuned wind turbine induced by blade local damage using continuum mathematical model

Mengyao Peng, Yi Hui, Qingshan Yang, Gang Liu and Siu-Seong Law

Renewable Energy, 2025, vol. 252, issue C

Abstract: Blade damage can cause mistuning on wind turbine system, which in turn affects the modal characteristics and dynamic stability of the structure. However, most of the existing numerical structure models can hardly capture the mistuning effect for the operating turbine. This study focuses on the modal characteristics of large-scale wind turbine systems affected by blade local damage (mistuning). A continuum mathematical model of the wind turbine system, considering blade local damage, is derived. This model can accurately consider the blade local damage, without adopting a large degrees of freedom model. The Lyapunov-Floquet method is employed to numerically study the modal characteristics of the mistuned NREL 5-MW wind turbine. The effects of local damage length, damage severity, and damage location on the modal characteristics of the blade and turbine structure are examined, respectively. The results show that local damage has weak impact on the mode shapes of blade itself. However, even slight local damage of blade can lead to significant changes in modal amplitude and phase for the wind turbine system. Strong modal localization can especially be observed from the backward and forward whirling modes.

Keywords: Modal analysis; Mistuned wind turbine; Blade local damage; Lyapunov-floquet; Continuum mathematical model (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:252:y:2025:i:c:s0960148125011826

DOI: 10.1016/j.renene.2025.123520

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