Dynamic analysis of rotating shafts using the absolute nodal coordinate formulation

Bozorgmehri, Babak; Hurskainen, Vesa-Ville; Matikainen, Marko K.; Mikkola, Aki

doi:10.1016/j.jsv.2019.03.022

Cited by 25 publications

(12 citation statements)

References 24 publications

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“…Additionally, as it was in Section 4. 3 The second version of the F com with 4 variables is as follows:…”

Section: Enhanced Deformation Gradient Methods -Edgmentioning

confidence: 99%

“…The next numerical test was an eigenfrequencies analysis, which was used for ANCF beams in multiple works [12,10,7,17,16,3,18] etc. There are multiple reasons for deciding to consider the eigenfrequency analysis.…”

Section: Eigenfrequencies Of the Simply Supported Beammentioning

confidence: 99%

“…In [12], the eigenfrequency analysis was used to see if beam elements could capture the Poisson modes. The solution of the nonlinear problem depends on the set of deformation shapes assumed for the models.In this study, the example of a simply supported beam used in [10,7,17,16,3] was analyzed.…”

Section: Eigenfrequencies Of the Simply Supported Beammentioning

confidence: 99%

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Review of Locking Alleviation Methods for Continuum-based ANCF Elements

Obrezkov

Mikkola

Matikainen

2022

Preprint

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The absolute nodal coordinate formulation (ANCF) is a nonlinear finite element approach proposed for the large deformation dynamics analysis of beam- and plate/shell-type structures. In the ANCF approach, elastic forces can be defined using three-dimensional elasticity based continuum mechanics. This approach is often straightforward, and it makes it possible to use advanced material models in the ANCF framework. However, it has been pointed out in several studies that continuum ANCF-based elements with a full three-dimensional elasticity description can suffer from locking phenomena. In this study, a comparison between various combinations of locking alleviation techniques and their applicability to different ANCF beam variants is studied using numerical examples. Furthermore, the enhanced deformation gradient (EDG) technique, which has been proposed recently in finite element literature, is demonstrated for high-order ANCF beam elements. Based on the numerical tests, none of currently available techniques are suitable for all types of ANCF elements. The paper also shows that the efficiency and accuracy of the techniques are case dependent. For the ANCF beam element involving higher-order terms with respect to trapezoidal mode, however, the EDG-based techniques are preferable to reduce locking phenomena.

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“…Additionally, as it was in Section 4. 3 The second version of the F com with 4 variables is as follows:…”

Section: Enhanced Deformation Gradient Methods -Edgmentioning

confidence: 99%

Section: Eigenfrequencies Of the Simply Supported Beammentioning

confidence: 99%

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Review of Locking Alleviation Methods for Continuum-based ANCF Elements

Obrezkov

Mikkola

Matikainen

2022

Preprint

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“…Shaft flexibility should be taken into account to predict and model drivetrain vibrations, originating from the turbine rotor, the PMSG or the bearings [100]. In order to perform a vibration and modal analysis of the drivetrain, a more advanced higher-order multi-body model is required as shown in [101,102].…”

Section: Structure and Drivetrain Mechanicsmentioning

confidence: 99%

“…Nevertheless, it allows combining the merits of different modelling techniques eventually leading to a more realistic virtual replica. Computational Fluid Dynamics [69] FEM structural blade model [70][71][72] Large Eddy Simulation (LES) [78][79][80] FEM model of turbine shaft [103] FEM model of the tower and support structure [89,90] Electromagnetic FEM [109][110][111] Dynamic switching models [127][128][129] Conduction and switching loss models [130,131] Transient wide-bandgap component models [132] Full pitch drivetrain models [150][151][152][153] Full yaw drivetrain models [154,155] Blade-Element Momentum [57] Extensions -Tip losses [60,61] -Dynamic stall [62,63] -Blade flexibility [64,65] -Tower and nacelle flow disturbance [66] -Gaussian [82] or Curl [83] wake model Surrogate models [73][74][75] Multi-body drivetrain model [101,102] Multi-body tower and foundation model [84][85][86]<...>…”

Section: Virtual Replicamentioning

confidence: 99%

Digital Twins for Wind Energy Conversion Systems: A Literature Review of Potential Modelling Techniques Focused on Model Fidelity and Computational Load

et al. 2021

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The Industry 4.0 concept of a Digital Twin will bring many advantages for wind energy conversion systems, e.g., in condition monitoring, predictive maintenance and the optimisation of control or design parameters. A virtual replica is at the heart of a digital twin. To construct a virtual replica, appropriate modelling techniques must be selected for the turbine components. These models must be chosen with the intended use case of the digital twin in mind, finding a proper balance between the model fidelity and computational load. This review article presents an overview of the recent literature on modelling techniques for turbine aerodynamics, structure and drivetrain mechanics, the permanent magnet synchronous generator, the power electronic converter and the pitch and yaw systems. For each component, a balanced overview is given of models with varying model fidelity and computational load, ranging from simplified lumped parameter models to advanced numerical Finite Element Method (FEM)-based models. The results of the literature review are presented graphically to aid the reader in the model selection process. Based on this review, a high-level structure of a digital twin is proposed together with a virtual replica with a minimum computational load. The concept of a multi-level hierarchical virtual replica is presented.

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