A Continuum Based Three-Dimensional Modeling of Wind Turbine Blades

Bayoumy, Ahmed H.; Nada, Ayman A.; Megahed, Saïd M.

doi:10.1115/1.4007798

Cited by 22 publications

(17 citation statements)

References 26 publications

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“…In general, most studies on ANCF shell elements have been based on purely academic models that are usually rectangular. One practical application of initially curved ANCF shell elements has been the analysis of large deflection wind turbine blades [1,2,11]. The focus in these studies has been on the discretization of the complex blade geometry into an ANCF finite element mesh rather than the computational performance of the discretized model.…”

Section: Introductionmentioning

confidence: 99%

Behavior of thin rectangular ANCF shell elements in various mesh configurations

et al. 2014

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The absolute nodal coordinate formulation (ANCF) is characterized by being developed specifically for dynamic analysis of large deformation problems. The objective of the study is to investigate how the shape of the initial mesh configuration influences the obtained numerical solution. After a thorough review of three available formulations, they are used in three different convergence studies. Initially a reference study is conducted to determine how the ANCF performs in an uniform and rectangular mesh. Subsequently, the ANCF methods sensitivity to irregular mesh is investigated and finally, the ability of the ANCF method to describe curved structures is evaluated. This study concludes that thin ANCF shell elements are sensitive to both the initial shape and their loading condition. Furthermore, both the initial configuration and the loading condition affect how the ANCF-based models

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Section: Introductionmentioning

confidence: 99%

Behavior of thin rectangular ANCF shell elements in various mesh configurations

et al. 2014

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“…Under the umbrella of the multibody system dynamics, efficient procedure was developed for mapping airfoils geometry of wind turbine blades into flexible models using absolute nodal coordinate formulation (ANCF) [4,5]. This procedure is extended to involve the complete aerodynamical and structural behavior of blades with the nonuniform and twisted configuration [6].…”

Section: Introductionmentioning

confidence: 99%

Computational Design Scheme for Wind Turbine Drive-Train Based on Lagrange Multipliers

et al. 2017

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The design optimization of wind turbines and their subsystems will make them competitive as an ideal alternative for energy. This paper proposed a design procedure for one of these subsystems, which is the Wind Turbine Drive-Train (WTDT). The design of the WTDT is based on the load assumptions and considered as the most significant parameter for increasing the efficiency of energy generation. In industry, these loads are supplemented by expert assumptions and manipulated to design the transmission elements. In contrary, in this work, the multibody system approach is used to estimate the static as well as dynamic loads based on the Lagrange multipliers. Lagrange multipliers are numerical parameters associated with the holonomic and nonholonomic constraints assigned in the drive-train model. The proposed scheme includes computational manipulations of kinematic constraints, mapping the generalized forces into Cartesian respective, and enactment of velocity-based constrains. Based on the dynamic model and the obtained forces, the design process of a planetary stage of WTDT is implemented with trade-off’s optimization in terms of gearing parameters. A wind turbine of 1.4 megawatts is introduced as an evaluation study of the proposed procedure, in which the main advantage is the systematic nature of designing complex systems in motion.

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“…In Nada, 8 the ANCF is used for constructing a continuum model of blade-span with uniform structure, in this model, Bspline surface is used to approximate airfoil structures. In Bayoumy et al, 18 the ANCF is used in modeling the blade-span for non-uniform and twisted structure; in this model, an analytical and explicit procedure is established for calculating the ANCF positions and gradients of NACA (National Advisory Committee for Aeronautics airfoils). Both models concern the ANCF thin plate element for modeling the blade-span structure due to its aerodynamical nature.…”

Section: Introductionmentioning

confidence: 99%

Methods of modeling slope discontinuities in large size wind turbine blades using absolute nodal coordinate formulation

Bayoumy¹,

Nada

Megahed

2014

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper describes and evaluates the use of the Absolute Nodal Coordinate Formulation (ANCF) in modeling large size wind turbine blades. Modern blade model can be divided into two regions classified by aerodynamic and structural function. The aerodynamic region, blade-span, is utilizing the thinnest possible airfoil section. On the other hand, the transition between the circular mount and the first airfoil profile is referred as blade-root region, which carries highest loads along the blade. In this investigation, an efficient procedure is developed for mapping NACA airfoil wind-turbine blades into ANCF thin plate models. The procedure concerns a complete wind turbine blade structure, blade-root as well as the blade-span regions with non-uniform and twisted nature. As a result, the slope discontinuity problem arises in both chord-wise and span-wise directions, and consequently presents numerical errors in dynamic simulation. The paper investigates the methods of modeling slope discontinuity resulting from the variations of the cross-sectional layouts across the blade. The developed method is applied for the gradient-deficient thin plate element in order to account for structural discontinuity. In addition, the aerodynamic loads are precisely expressed and the aerodynamic characteristics of such blades are examined with the ANCF and with the classical finite element method. The static and dynamic solutions of different operating conditions are obtained and results are compared with those obtained using ANSYS code. Both the limitations and advantages of using the ANCF in modeling large size wind turbine blades are concluded and discussed. A Dynamics for Design (DFD) procedure is presented with numerical example concerning large-rotation, large deformation wind turbine blades.

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A Continuum Based Three-Dimensional Modeling of Wind Turbine Blades

Cited by 22 publications

References 26 publications

Behavior of thin rectangular ANCF shell elements in various mesh configurations

Behavior of thin rectangular ANCF shell elements in various mesh configurations

Computational Design Scheme for Wind Turbine Drive-Train Based on Lagrange Multipliers

Methods of modeling slope discontinuities in large size wind turbine blades using absolute nodal coordinate formulation

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