Operational Modal Analysis of Wind Turbine Structures: A Maximum Likelihood Approach

Operational modal analysis consists of estimating the modal parameters of a built structure when the system inputs are unknown. From a modeling perspective, these unmeasured inputs are treated as stationary random white noise. However, in the case of wind turbine structures, the unmeasured loads cannot be regarded as white noise excitation due to the rotation of the rotor, which introduces harmonic components. queryPer Springer style, both city and country names must be present in the affiliations. Accordingly, we have inserted the city names in all affiliations. Please check and confirm if the inserted city names are correct. If not, please provide us with the correct city names.Traditional OMA algorithms identify these harmonic frequencies as structural modes, making it challenging to distinguish between them, especially when their frequencies are similar. This paper proposes a state space model to deal with harmonic components and also proposes to estimate this model using the maximum likelihood method.