Fatigue analysis

Ma, Kai-Tung; Luo, Yong; Kwan, Thomas; Wu, Yongyan

doi:10.1016/b978-0-12-818551-3.00006-5

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Additionally, fatigue damage is also computed based on an SN curve based approach and the Palmgren-Miner rule [4]. It should be noted that while fatigue damage itself can be estimated from different approaches with different levels of complexity (see, for instance, [5,6,7,8,9]), here it can be interpreted as a metric to evaluate the accuracy of the estimated bending moments, implying that while the absolute value may differ, it is expected that the conclusions would still hold if more sophisticated approaches were used.…”

Section: Introductionmentioning

confidence: 99%

New methodology to estimate fatigue from acceleration time series experimentally validated in an onshore and floating offshore wind turbine

Pimenta,

Mata,

Magalhães

2024

J. Phys.: Conf. Ser.

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In onshore wind turbines, the association of fatigue damage with the environmental conditions based on the wind field properties have already been shown to be effective. However, most of the predictive power of such approach is based on average results, being the informative power regarding a single event extremely reduced. In this paper, a new methodology based on a reduced order model where the tower top accelerations are explicitly taken into consideration is proposed, with the adequate adaptations for floating offshore and onshore applications. After a numerical validation of the model predictions using OpenFAST, the methodology is used to reconstruct the bending moments time series of both an onshore and a floating wind turbine that are currently being monitored with accelerometers and strain gauges. The existence of this experimental data allowed for a direct comparison of the accelerations based estimates with the values obtained from the strain gauges readings and the method was proven to reproduce with great accuracy the tower bending moments time series. This conclusion sustain the claim that the proposed methodology for fatigue estimation is more robust than conventional SCADA-driven approaches and more informative regarding each individual event, making it suitable to be used in real time decision making processes.

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Section: Introductionmentioning

confidence: 99%

New methodology to estimate fatigue from acceleration time series experimentally validated in an onshore and floating offshore wind turbine

Pimenta,

Mata,

Magalhães

2024

J. Phys.: Conf. Ser.

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“…In general, two distinct approaches in fatigue analysis can be followed [4]: (a) use the cumulative fatigue damage to predict fatigue life, assuming that a failure occurs after a number of loading cycles at a particular tension/stress range; and (b) examine the fracture behavior of mechanical elements under dynamic loads and consider that a failure occurs if the remaining strength of the component is insufficient because of cracks that have grown to a critical length. Although the second method is more accurate for fatigue life prediction, it is not commonly used because crack behavior models are more complex to determine.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Assessment of Wind Turbine Towers: Review of Processing Strategies with Illustrative Case Study

et al. 2022

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Wind turbines are structures predominantly subjected to dynamic loads throughout their period of life. In that sense, fatigue design plays a central role. Particularly, support structure design might be conservative with respect to fatigue, which may lead to a real fatigue life of considerably more than 20 years. For these reasons, the implementation of a fatigue monitoring system can be an important advantage for the management of wind farms, providing the following outputs: (i) estimation of the evolution of real fatigue condition; (ii) since the real condition of fatigue damage is known, these results could be an essential element for a decision about extending the lifespan of the structure and the possibility of repowering or overpowering; and (iii) the results of the instrumented wind turbines can be extrapolated to other wind turbines of the same wind farm. This paper reviews the procedures for calculating the fatigue damage of wind turbine towers using strain measurements. The applicability of the described procedures is demonstrated with experimental data acquired in an extensive experimental campaign developed at Tocha Wind Farm, an onshore wind farm located in Portugal, exploring the impact of several user-defined parameters on the fatigue results. The paper also includes the description of the data processing needed to convert raw measurements into bending moments and several validation and calibration steps.

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Fatigue Assessment of Offshore Triceratops Restraining System Under Hurricane-driven Metocean Conditions

Chandrasekaran

Shah²,

Chauhan³

2022

Int J Steel Struct

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Fatigue analysis

Cited by 3 publications

References 13 publications

New methodology to estimate fatigue from acceleration time series experimentally validated in an onshore and floating offshore wind turbine

New methodology to estimate fatigue from acceleration time series experimentally validated in an onshore and floating offshore wind turbine

Fatigue Assessment of Wind Turbine Towers: Review of Processing Strategies with Illustrative Case Study

Fatigue Assessment of Offshore Triceratops Restraining System Under Hurricane-driven Metocean Conditions

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