Evaluation of fatigue damage model predictions for fixed offshore wind turbine support structures

Yeter, Baran; Garbatov, Y.; Soares, C. Guedes

doi:10.1016/j.ijfatigue.2016.01.007

Cited by 57 publications

(33 citation statements)

References 37 publications

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“…The power spectra of road, wave or wind loading can be input in a structural dynamic analysis aimed at estimating the fatigue damage by spectral methods. Interesting examples of real case studies can be found, for example, in [74,75].…”

Section: Non-stationary Processesmentioning

confidence: 99%

Frequency‐based analysis of random fatigue loads: Models, hypotheses, reality

Benasciutti

Tovo

2018

Materialwissenschaft Werkst

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Spectral methods use analytical expressions to estimate the fatigue damage in vibrating structures subjected to uniaxial or multiaxial random stresses. They exploit the random vibration theory which idealizes the random stress as a random process characterized by a power spectral density (PSD) in the frequency‐domain. The random process is hypothesized to be stationary or non‐stationary, Gaussian or non‐Gaussian, and with narrow‐band or wide‐band power spectral density. The accuracy of analytical spectral solutions depends on whether such hypotheses are fulfilled by actual random time‐histories encountered in practice. Knowing the range of applicability of each spectral method is then of utmost importance to avoid estimation errors. After a short account on the frequency‐domain description of random processes, this paper presents a brief survey on selected spectral methods for uniaxial and multiaxial random loading. It then analyzes when the hypotheses behind each spectral method are not verified in reality, with the purpose to provide recommendations for a safe use of frequency‐based methods.

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Section: Non-stationary Processesmentioning

confidence: 99%

Frequency‐based analysis of random fatigue loads: Models, hypotheses, reality

Benasciutti

Tovo

2018

Materialwissenschaft Werkst

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Section: Introductionmentioning

confidence: 99%

“…Aerodynamic fatigue has always received high degree of interest in the failure of complicated rotating and moving systems, especially the blade structure of wind turbine system under complex aerodynamic disturbance. [6][7][8] Fatigue issues on wind turbine system or even aircrafts is regarded as an important factor when designing its service life and evaluating fatigue damage due to alternating aerodynamic loads. [9][10][11] Accident of 1950s' aircraft explosion of the British "Iridium" tells that when the aircraft airtight cockpit is continuously subjected to decompression and pressurization due to flight altitude changes, fatigue failure and breakage of fuselage structure is expected.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic load spectrum and fatigue behaviour of high‐speed train's equipment cabin

Zhou

Chen

Wang

et al. 2019

Fatigue Fract Eng Mat Struct

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In present study, the aerodynamic fatigue behaviour of train equipment cabin was investigated. Pressure sensors were arranged at train passing side. Eight‐grade load spectrum was constructed by means of rain‐flow counting, and fatigue damage was calculated with Miner's rule and Carten‐Dolan rule, both for the matrix metals and welds. For welds, defect detection was considered via visual inspection with nondestructive test (VI‐NDT), pure nondestructive test (P‐NDT), and without nondestructive test (W‐NDT). The result confirms that welds play an unfavourable role rather than matrix metals. Weld damage in W‐NDT exceeds its limit (1.0) to designed mileage. Then, damage influence was studied under tunnel passing, train passing, and running direction. Running direction as the head car contributes 82% to approximately 86% and 70% to approximately 77% of the total damage for matrix metal and welds, respectively. Train passing gives more damage to matrix metals than welds. Tunnel passing contributes 25% to approximately 26% for both matrix metals and welds.

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“…In summary, scour has been shown to influence the fatigue life (FL) of OWTs, and the effect of scour and backfilling on long‐term damage in a parked wind turbine has been researched . Due to the complexities associated with the fatigue analysis of OWTs, simplified methods have been proposed for this analysis . However, the quantification of the scour influence on the FL of an operational wind turbine and specific simplified methods for scour effects on fatigue analysis remain outstanding.…”

Section: Introductionmentioning

confidence: 99%

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Rezaei¹,

Duffour²,

Fromme³

2018

Wind Energy

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Offshore wind turbines supported on monopiles are an important source for renewable energy. Their fatigue life is governed by the environmental loads and in the dynamic behavior, depending on the support stiffness and thus soil‐structure interaction. The effects of scour on the short‐term and long‐term responses of the NREL 5‐MW wind turbine under operational conditions have been analyzed by using a finite element beam model with Winkler springs to model soil‐structure interaction. It was found that due to scour, the modal properties of the wind turbine do not change significantly. However, the maximum bending moment in the monopile increases, leading to a significant reduction in fatigue life. Backfilling the scour hole can recover the fatigue life, depending mostly on the depth after backfilling. An approximate fatigue analysis method is proposed, based on the full time‐domain analysis for 1 scour depth, predicting with good accuracy the fatigue life for different scour depths from the quasi‐static changes in the bending moment.

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Evaluation of fatigue damage model predictions for fixed offshore wind turbine support structures

Cited by 57 publications

References 37 publications

Frequency‐based analysis of random fatigue loads: Models, hypotheses, reality

Frequency‐based analysis of random fatigue loads: Models, hypotheses, reality

Aerodynamic load spectrum and fatigue behaviour of high‐speed train's equipment cabin

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

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