Aero-servo-elastic modeling and control of wind turbines using finite-element multibody procedures

Bottasso, Carlo L.; Croce, Alessandro; Savini, B.; Sirchi, Walter; Trainelli, L.

doi:10.1007/s11044-006-9027-1

Cited by 74 publications

(69 citation statements)

References 4 publications

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“…Readers interested in the mathematical formulation of Cp-Lambda can refer to Bauchau et al (2003), Bottasso et al (2006), Bauchau et al (2009), andBauchau (2011), while wind turbine applications of the code can be found among others in Bottasso et al (2011Bottasso et al ( , 2015.…”

Section: Aeroservoelastic Simulatormentioning

confidence: 99%

Combined preliminary–detailed design of wind turbines

Bortolotti¹,

Bottasso

Croce

2016

Wind Energ. Sci.

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Abstract. This paper is concerned with the holistic optimization of wind turbines. A multi-disciplinary optimization procedure is presented that marries the overall sizing of the machine in terms of rotor diameter and tower height (often termed "preliminary design") with the detailed sizing of its aerodynamic and structural components. The proposed combined preliminary-detailed approach sizes the overall machine while taking into full account the subtle and complicated couplings that arise due to the mutual effects of aerodynamic and structural choices. Since controls play a central role in dictating performance and loads, control laws are also updated accordingly during optimization. As part of the approach, rotor and tower are sized simultaneously, even in this case capturing the mutual effects of one component over the other due to the tip clearance constraint. The procedure, here driven by detailed models of the cost of energy, results in a complete aero-structural design of the machine, including its associated control laws.The proposed methods are tested on the redesign of two wind turbines, a 2.2 MW onshore machine and a large 10 MW offshore one. In both cases, the optimization leads to significant changes with respect to the initial baseline configurations, with noticeable reductions in the cost of energy. The novel procedures are also exercised on the design of low-induction rotors for both considered wind turbines, showing that they are typically not competitive with conventional high-efficiency rotors.

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Section: Aeroservoelastic Simulatormentioning

confidence: 99%

Combined preliminary–detailed design of wind turbines

Bortolotti¹,

Bottasso

Croce

2016

Wind Energ. Sci.

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“…All simulations are performed with an aeroservoelastic model of the wind turbine implemented with the flexible multibody program Cp-Lambda (see Bottasso et al, 2006, and references therein). The baseline regulation strategy is provided by an external library implementing the control routines reported in Hansen and Henriksen (2013).…”

Section: Reference Wind Turbine and Simulation Environmentmentioning

confidence: 99%

Articulated blade tip devices for load alleviation on wind turbines

Bottasso

Croce²,

Gualdoni³

et al. 2016

Wind Energ. Sci.

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Abstract. This paper investigates the load alleviation capabilities of an articulated tip device, where the outermost portion of the blade can rotate with respect to the rest of the blade. Passive, semi-passive and active solutions are developed for the tip rotation. In the passive and semi-passive configurations tip pitching is mainly driven by aerodynamic loads, while for the active case the rotation is obtained with an actuator commanded by a feedback control law. Each configuration is analyzed and tested using a high-fidelity aeroservoelastic simulation environment, by considering standard operative conditions as well as fault situations. The potential benefits of the proposed blade tip concepts are discussed in terms of performance and robustness.

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“…For systems in which the bodies are made of standard materials, there is a wide variety of finite elements that may be used, but when bodies are made of composite materials, the model flexibility often necessitates expensive finite element models with an inherent growth in complexity. Models of systems involving multibody dynamics methodologies also require a complete knowledge of the arrangement of the system components, which is achieved by the definition of kinematic joints, the introduction of models for external forces and the incorporation of the equilibrium equations of other disciplines [Heckmann et al 2005;Møller et al 2005;Bottasso et al 2006]. Regardless of each particular type of joint used, the mathematical description of the restrictions involving only rigid bodies are the simplest to obtain.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a satellite with composite materials

Ambrósio

Neto

Leal

2007

JOMMS

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The design of complex flexible multibody systems for industrial applications requires not only the use of powerful methodologies for the system analysis, but also the ability to analyze potential designs and to decide on the merits of each one of them. This paper presents a methodology using optimization procedures to find the optimal layouts of fiber composite structure components in multibody systems. The goal of the optimization process is to minimize structural deformation and to fulfill a set of multidisciplinary constraints. These methodologies rely on the efficient and accurate calculation of the system sensitivities to support the optimization algorithms. In this work a general formulation for the computation of the first order analytic sensitivities based on the direct differentiation method is used. The direct method for sensitivity calculation is obtained by direct differentiation of the equations defining the response of the structure with respect to the design variables. The equations of motion and the sensitivities of the flexible multibody system are solved simultaneously and, therefore, the accelerations and velocities of the system, and the sensitivities of the accelerations and velocities, are integrated in time using a multistep multiorder integration algorithm. Different models for the flexible components of the system, using beam and plate elements, are also considered. Finally, the methodology proposed here is applied to the optimization of the unfolding of a complex satellite made of composite plates and beams. The ply orientations of lamination are the continuous design variables. The potential difficulties in the optimization of composite flexible multibody systems are highlighted in the discussion of the results obtained.

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Aero-servo-elastic modeling and control of wind turbines using finite-element multibody procedures

Cited by 74 publications

References 4 publications

Combined preliminary–detailed design of wind turbines

Combined preliminary–detailed design of wind turbines

Articulated blade tip devices for load alleviation on wind turbines

Optimization of a satellite with composite materials

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