Dynamics of wind turbines

Garrad, A.D.

doi:10.1049/ip-a-1.1983.0080

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…Details of the derivation of the BEM equations can be found elsewhere. 38 F I G U R E 3 Variation of speed of waves with increasing depth from free surface of sea…”

Section: Aerodynamic Forces Due To Windmentioning

confidence: 99%

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On the performance of monopile weldments under service loading conditions and fatigue damage prediction

Biswal

Mamun

Mehmanparast

2021

Fatigue Fract Eng Mat Struct

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Thick weldments used in offshore structures frequently act as fatigue crack initiation sites due to stress concentration at weld toe as well as weld residual stress fields. This paper investigates the cyclic deformation behavior of S355 G10+M steel, which is predominantly used in offshore wind applications. Owing to the vast size difference of monopile structure and weld cross-section, a global-local finite element (FE) method was used, and the weld geometry was adopted from circumferential weld joints used in offshore wind turbine monopile foundations. Realistic service loads collected using supervisory control and data acquisition (SCADA) and wave buoy techniques were used in the FE model. A nonlinear isotropic-kinematic hardening model was calibrated using the strain controlled cyclic deformation results obtained from base metal (BM) as well as cross-weld specimen tests. The tests revealed that the S355 G10 +M BM and weld metal (WM) undergo continuous cyclic stress relaxation.Fatigue damage over a period of 20 years of operation was predicted using the local stress at the root of the weldments as the life limiting criterion. This study helps in quantifying the level of conservatism in the current monopile design approaches and has implications towards making wind energy more economic.

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“…Details of the derivation of the BEM equations can be found elsewhere. 38 F I G U R E 3 Variation of speed of waves with increasing depth from free surface of sea…”

Section: Aerodynamic Forces Due To Windmentioning

confidence: 99%

“…The classical blade element momentum (BEM) approach 38 was used to compute the loads acting on the rotor due to coursing wind. The wind behavior was modeled with a one-dimensional wave theory.…”

Section: Aerodynamic Forces Due To Windmentioning

confidence: 99%

On the performance of monopile weldments under service loading conditions and fatigue damage prediction

Biswal

Mamun

Mehmanparast

2021

Fatigue Fract Eng Mat Struct

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“…Though the idea of aeroelasticity goes back to 1947 as introduced by A. R. Collar, its application for wind turbine design and analysis begins as late as 1976 by Friedmann [4] who derived a set of coupled flap-lag-torsional equation of motion for a single blade. In later years significant evolution has been achieved [5][6][7][8]. Aeroelasticity studies the coupling effects between the inertia, elastic, and aerodynamic forces, which occur as an elastic body exposed to a fluid flow.…”

Section: Aeroelasticitymentioning

confidence: 99%

Wind Turbine Aeroelastic Modeling: Basics and Cutting Edge Trends

Ageze

2017

International Journal of Aerospace Engineering

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The interaction of fluid flow and the structure dynamic of the system is a vital subject for machines operating under their coupling. It is not different for wind turbine either, especially as the coupling enhanced for multi-MW turbine with larger and flexible blades and complex control methods, and other nonlinearity, more comprehensive aeroelastic tools will be required to investigate the realistic phenomena. The present paper will overview the aeroelastic tool for wind turbine, the efforts done, gaps, and future directions indicated. One starts with background of the subject, presenting a case study to demonstrate the effect of fluid-structure interaction considering NREL 5MW blade and a brief comparison of several aeroelastic codes. Cutting edge efforts done in the area such as complex inflow, effect of geometric nonlinearity, and other stability and smart control issues are addressed and concluded by elaborating the gaps and future direction of aeroelasticity of wind turbine.

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“…Esto puede aprovecharse para vaciar las palas de la hélice con la intención de reducir la masa de las mismas. A pesar de esto, los valores de tensión siguen siendo relativamente bajos comparados con los valores críticos de fallos aproximados entorno a 0.02 [108].…”

Section: Caso De Estudiounclassified

“…El material de las hélices es aluminio, con E = 70 GPa y estas están vaciadas para reducir el peso total, de tal manera que el grosor mínimo es de 3 mm. Valores de tensión cerca de σ ≈ 0.02 originan fallo estructural [108]. Debido a las distintas variaciones de sección a lo largo de la pala, la variación de las tensiones no es monótona.…”

Section: Caso De Estudiounclassified

Estudio del sistema motopropulsivo para Pseudo-satélites = Design of the propulsion system for High Altitude Pseudo-Satellites

Gutiérrez¹

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Me gustaría agradecer, en primer lugar, a mis directores de tesis, Jesús Gonzalo de Grado y Deibi López por ofrecerme la oportunidad de realizar esta tesis y darme su apoyo a lo largo de todos estos años. También estaré siempre agradecido a Alberto Escapa y Diego Domínguez, por la ayuda que constantemente me han ofrecido y todo lo que aprendí de ellos.Gracias a mi familia, por ser ese pilar de apoyo indispensable. En especial, a mi madre y hermana, por soportarme en los malos días.

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Dynamics of wind turbines

Cited by 11 publications

References 2 publications

On the performance of monopile weldments under service loading conditions and fatigue damage prediction

On the performance of monopile weldments under service loading conditions and fatigue damage prediction

Wind Turbine Aeroelastic Modeling: Basics and Cutting Edge Trends

Estudio del sistema motopropulsivo para Pseudo-satélites = Design of the propulsion system for High Altitude Pseudo-Satellites

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