Multi-hazard fragility analysis for a wind turbine support structure: An application to the Southwest of Mexico

Campo, J. Osvaldo Martín del; Pozos‐Estrada, Adrián

doi:10.1016/j.engstruct.2019.109929

Cited by 17 publications

(18 citation statements)

References 20 publications

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“…A fragility analysis for the combined hazards of wind and earthquake has been presented in the literature 6 . Here, a similar analysis was performed to compare the results from the effects of extreme loads.…”

Section: Development Of Fragility Curvesmentioning

confidence: 99%

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Development of fragility curves of land‐based wind turbines with tuned mass dampers under cyclone and seismic loading

Campo

Pozos‐Estrada

2020

Wind Energy

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Passive damping systems have been widely studied to improve the response of wind turbine structures under operational conditions. However, there is insufficient information on how these systems enhance reliability for extreme loads. Wind farm construction has been growing rapidly in recent decades, thereby moving wind turbine structures to sites with higher seismic and hurricane hazards. This research presents a numerical study performed on three land‐based wind turbines, similar to typical turbines installed in Mexican wind farms, under cyclone‐induced wind and earthquake action. The fictional location of the turbines is justified by the wind capacity distribution of Mexico, which is a country with high seismic and tropical cyclone risk. The wind field is simulated from semiempirical mean velocity models, and the ground motion records are obtained from real events recorded near the assumed site. All the time history analyses assume that the turbines are in parked condition. The results indicate that a fragility reduction of approximately 80% can be achieved under cyclone‐induced winds when passive damping systems are added to the structure, and that the fragility reduction is significantly less under seismic action.

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Section: Development Of Fragility Curvesmentioning

confidence: 99%

“…Jaimes et al 5 performed a probabilistic evaluation of the risk for wind farms located in Mexico, subjected to cyclone‐induced wind loads. Martín del Campo and Pozos‐Estrada 6 performed a fragility analysis of a hypothetical turbine located in Southwest Mexico, evaluating combined earthquake and wind loads from simulated records.…”

Section: Introductionmentioning

confidence: 99%

Development of fragility curves of land‐based wind turbines with tuned mass dampers under cyclone and seismic loading

Campo

Pozos‐Estrada

2020

Wind Energy

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“…With new offshore wind farms being planned in earthquake-prone regions, there is a rising interest in investigating the seismic vulnerability of wind turbines. In this context, numerical models utilized for dynamic analysis of wind turbines idealise or even oversimplify the rotor details [1][2][3][4][5][6]. The general details on a rotor-nacelle-assembly (RNA), such as the rotor diameter, nacelle, hub, and the blades' mass, are readily available [7][8][9] and are simple to model.…”

Section: Introductionmentioning

confidence: 99%

“…However, the local blades details, such as airfoil shape, twist angle, and material distribution, are not only challenging to find but are also numerically complicated and computationally expensive. As a result, it is a common practice to either assume these details [5][6][7]10] and/or use the lumped mass approach to represent the RNA in finite element models (FEM) of wind turbines [1,11].…”

Section: Introductionmentioning

confidence: 99%

A Simplified Blade Model for Reliable Seismic Assessments of Wind Turbines

Ali¹,

Risi²

2021

14th WCCM-ECCOMAS Congress

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Wind turbines are dynamically complex structures. They entail slender towers, flexible foundations, and heavy rotor-nacelle-assembly (RNA). In the context of earthquake analysis, the RNA is often simplified as a rigid point mass which can suppress the modal contribution of blades from the global system dynamics and may further affect the reliability of seismic response of wind turbines. Other high-fidelity finite element (FE) blade models are difficult to implement due to the complex layup of composite materials and reduced computational efficiency. Thus, there is a need for an intermediate solution that allows the realistic and accurate consideration of blades in the seismic assessment of wind turbines. This study presents a meta-heuristic, problem-independent optimisation method, known as the genetic algorithm (GA), to identify simplified material and cross-sectional properties of a typical wind turbine blade. The properties are used to construct a simplified FE blade model that can be implemented in global wind turbine models. The optimised design solutions are examined with regards to the mechanical and dynamic response of a reference 5MW wind turbine having 61.5 m long blades. The accuracy of the modal behaviour validates the presented optimisation and simplified blade modelling approach and signifies the potential of its application in seismic assessments of wind turbines.

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“…Avossa et al [35] presented the preliminary results of a probabilistic framework for the design and assessment of land-based horizontal axis wind turbines subjected to combined wind and seismic actions. del Campo and Pozos-Estrada [36] performed a fragility analysis for a wind turbine structure located in the Southwest of Mexico, taking into consideration wind and earthquake action. Some of these papers have considered the interaction between seismic and aerodynamic loads, but the rotor speed and blade-pitch angle in these papers were fixed.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Baseline Control System on the Fragility of Large‐Scale Wind Turbine considering Seismic‐Aerodynamic Combination

Yuan

Chen

et al. 2020

Advances in Civil Engineering

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The purpose of this paper is to explore the effect of the baseline control system (BCS) on the fragility of large-scale wind turbine when seismic and wind actions are considered simultaneously. The BCS is used to control the power output by regulating rotor speed and blade-pitch angle in real time. In this study, the fragility analysis was performed and compared between two models using different peak ground acceleration, wind speeds, and specified critical levels. The fragility curves with different wind conditions are obtained using the multiple stripe analysis (MSA) method. The calculation results show that the probability of exceedance specified critical level increases as the wind speed increases in model 1 without considering BCS, while does not have an obvious change in the below-rated wind speed range and has a significant decrease in the above-rated wind speed range in model 2 with considering BCS. The comparison depicts that if the BCS is neglected, the fragility of large-scale wind turbine will be underestimated in around the cut-in wind speed range and overestimated in the over-rated wind speed range. It is concluded that the BCS has a great effect on the fragility especially within the operating conditions when the rated wind speed is exceeded, and it should be considered when estimating the fragility of wind turbine subjected to the interaction of seismic and aerodynamic loads.

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Multi-hazard fragility analysis for a wind turbine support structure: An application to the Southwest of Mexico

Cited by 17 publications

References 20 publications

Development of fragility curves of land‐based wind turbines with tuned mass dampers under cyclone and seismic loading

Development of fragility curves of land‐based wind turbines with tuned mass dampers under cyclone and seismic loading

A Simplified Blade Model for Reliable Seismic Assessments of Wind Turbines

Study on the Influence of Baseline Control System on the Fragility of Large‐Scale Wind Turbine considering Seismic‐Aerodynamic Combination

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