One year monitoring of an offshore wind turbine: Variability of modal parameters to ambient and operational conditions

Song, Mingming; Partovi Mehr, Nasim; Moaveni, Babak; Hines, Eric; Ebrahimian, Hamed; Bajric, Anela

doi:10.1016/j.engstruct.2023.117022

Cited by 15 publications

(4 citation statements)

References 38 publications

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“…Jacket fatigue is evaluated based on the stresses obtained from a SAP2000 FE model of the support structure for Turbine B2. This model is verified with the experimental data in the authors' previous studies [9,12]. As shown in (17), the thrust force is calculated from the bending moments at the instrumented section and applied to the FE model.…”

Section: Simplified Approach Assuming Static Loadingsupporting

confidence: 64%

“…So, the strain gauges are corrected so that the moments' center is moved to the origin, as shown in Figure 6b. The raw strain-gauge measurements are corrected using (10), (11), (12), (13), and the circle center (u c and v c ) values. The circle also does not match itself around coordinates (3,18).…”

Section: Strain Correction Resultsmentioning

confidence: 99%

“…The fatigue demand on the foundation has been studied using a full year of data. FE models of the B2 turbine have been built in SAP2000, OpenSees, and OpenFAST tools, and verified in the authors' previous studies [9,12]. Strain at several jacket joints is estimated using virtual sensing based on the FE model of the turbine.…”

Section: Introductionmentioning

confidence: 96%

“…The process of model updating or the integration of digital twinning is to update the digital twin based on the measured response of the structure, in this case, an OWT that is continuously monitored by sensors. The authors have experience in system identification and digital twinning of the 6 MW Block Island Wind Farm OWT [9][10][11][12][13] and an operational 6 MW monopile [14,15]. They also completed the Block Island Structural Monitoring Project for the U.S. Bureau of Safety and Environmental Enforcement [16].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fatigue Analysis of a Jacket-Supported Offshore Wind Turbine at Block Island Wind Farm

Partovi-Mehr,

DeFrancisci,

Minaeijavid

et al. 2024

Sensors

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Offshore wind-turbine (OWT) support structures are subjected to cyclic dynamic loads with variations in loadings from wind and waves as well as the rotation of blades throughout their lifetime. The magnitude and extent of the cyclic loading can create a fatigue limit state controlling the design of support structures. In this paper, the remaining fatigue life of the support structure for a GE Haliade 6 MW fixed-bottom jacket offshore wind turbine within the Block Island Wind Farm (BIWF) is assessed. The fatigue damage to the tower and the jacket support structure using stress time histories at instrumented and non-instrumented locations are processed. Two validated finite-element models are utilized for assessing the stress cycles. The modal expansion method and a simplified approach using static calculations of the responses are employed to estimate the stress at the non-instrumented locations—known as virtual sensors. It is found that the hotspots at the base of the tower have longer service lives than the jacket. The fatigue damage to the jacket leg joints is less than 20% and 40% of its fatigue capacity during the 25-year design lifetime of the BIWF OWT, using the modal expansion method and the simplified static approach, respectively.

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Section: Simplified Approach Assuming Static Loadingsupporting

confidence: 64%

Section: Strain Correction Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue Analysis of a Jacket-Supported Offshore Wind Turbine at Block Island Wind Farm

Partovi-Mehr,

DeFrancisci,

Minaeijavid

et al. 2024

Sensors

Self Cite

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Experimental Study on Identification of Aerodynamic Damping Matrix for the Tower of an Operating Wind Turbine by Artificial Excitation

Wang,

Lu,

et al. 2024

Wind Energy

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Quantitation of damping is of great significance for the design and condition assessment of wind turbines. The authors' previous theoretical and numerical studies showed that compared with damping ratios, a modal aerodynamic damping matrix can better describe the damping coupling in the fore‐aft (FA) and side‐side (SS) tower motions. In the present study, an improved damping identification method was first proposed to identify this damping matrix with artificial exciters and then verified by using OpenFAST simulations under different excitation frequencies, excitation force amplitudes, and turbulent wind fields. Following the numerical study, a scaled wind turbine model with a geometric scale ratio of 1/75 was carefully designed based on the NREL 5‐MW wind turbine prototype, in which the scaled blade design follows the rule in thrust coefficient similarity. An identification study was performed with this scaled model by a series of wind tunnel tests. The modal aerodynamic damping matrix was identified under steady‐state harmonic excitation in the operating state and compared with the identified results by a free decay method and the theoretical values. The results experimentally confirm the correctness of the aerodynamic damping matrix theory under uniform wind and the feasibility of the improved identification method in practice.

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Long-Term Vibrational Monitoring of the Exedra of Marcus Aurelius’ Hall

Rinaldi,

Crognale,

Ciambella

et al. 2024

Lecture Notes in Civil Engineering

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One year monitoring of an offshore wind turbine: Variability of modal parameters to ambient and operational conditions

Cited by 15 publications

References 38 publications

Fatigue Analysis of a Jacket-Supported Offshore Wind Turbine at Block Island Wind Farm

Fatigue Analysis of a Jacket-Supported Offshore Wind Turbine at Block Island Wind Farm

Experimental Study on Identification of Aerodynamic Damping Matrix for the Tower of an Operating Wind Turbine by Artificial Excitation

Long-Term Vibrational Monitoring of the Exedra of Marcus Aurelius’ Hall

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