Reduced basis methods for structurally nonlinear Joined Wings

Teunisse, Nick; Demasi, Luciano; Tiso, Paolo; Cavallaro, Rauno

doi:10.1016/j.ast.2017.05.041

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…(Incremental Dynamic Analysis) [2], for which many time history analyses are essential and the computational effort can be very high. Some main approaches to lessen the computational effort are: (1) reducing the structural systems by replacing the structures finite element models with models with less degrees of freedom [3,4], (2) reducing the number of essential earthquake records, e.g. see [5][6][7], (3) reducing the number of oscillatory modes [8,9], and (4) using higher order time integration methods [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Some main approaches to lessen the computational effort are: (1) reducing the structural systems by replacing the structures finite element models with models with less degrees of freedom [3,4], (2) reducing the number of essential earthquake records, e.g. see [5][6][7], (3) reducing the number of oscillatory modes [8,9], and (4) using higher order time integration methods [10][11][12]. Meanwhile, in the last two decades, approaches are developed to reduce the computational effort by reducing the earthquake records' data [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Technique for Time Integration With Steps Larger Than the Excitation Steps: Review of the Past and Addressing the Existing Challenges and a Perspective of the Future

Soroushian¹

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Time history analysis using a time integration method is a powerful broadly accepted tool for structural dynamic analysis. In practical areas, such as earthquake engineering, computations based on time history analysis might be computationally very expensive. In 2008, a technique was proposed to considerably reduce the computational effort by reducing the data in the earthquake record. This technique, which is recently named as a SEB THAAT, is reviewed in this paper. After a brief review on the formulation and implementation, the positive points, the limitations, and the challenges facing versatile implementation of the SEB THAAT are addressed, and a future perspective is presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Technique for Time Integration With Steps Larger Than the Excitation Steps: Review of the Past and Addressing the Existing Challenges and a Perspective of the Future

Soroushian¹

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…These studies show that the NLROM has great potentials for nonlinear response analysis of plates subject to acoustic excitation, therefore, can be used as efficient design and analysis tools for structure design. In general, the NLROM construction procedures can be divided into three steps, namely, the selection of ROBs; identification of NLROM parameters; modal displacement computation and transformation, whereby the first step or the selection of ROBs is the key element to construct an accurate NLROM, as the NLROM is constructed by projecting the FOM onto the subspace spanned by the ROBs [24]. How to select the effective ROBs varies from application to application, and remains a challenge in reduced order modelling community [25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear reduced order modeling for nonlinear response simulation of panels via Large Eddy Simulation

et al. 2021

Journal of Sound and Vibration

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“…Therefore, reduced order models are also preferred in wind turbine load and stability analysis . Although, these models work very well for the structures with small deflections, their accuracy decreases as the structure has large deflections and rotations . Most wind turbine components, except from the blades, show small deflections in operations.…”

Section: Introductionmentioning

confidence: 99%

Representation of wind turbine blade responses in power production load cases by linear mode shapes

Gözcü

Stolpe

2020

Wind Energy

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The wind turbine industry is designing large MW size turbines with very long blades, which exhibit large deflections during their operational life. These large deflections decrease the accuracy of linear models such as linear finite element and modal-based models, in which the structure is represented by linear mode shapes. The aim of this study is to investigate the competence of the mode shapes to represent the large blade responses in normal operation load cases. For this purpose, blade deflections are projected onto the linear modal space, swept by mode shape vectors. The projection shows the contribution of each mode and the projection error. The blade deflections are calculated by a nonlinear aero-servo-elastic solver for power production fatigue load cases with normal turbulence. The mode shapes are calculated at the steady-state deflected blade position computed at different wind speeds. Three reference turbine blades are used in the study to evaluate the effects of various blade design parameters such as length, stiffness, mass, and prebend. The results show that although the linear mode shapes can represent the flapwise and edgewise deflections accurately, axial and torsional deflections cannot be captured with good accuracy. The geometric nonlinear effects are more apparent in the latter directions.The results indicate that the blade deflections occur beyond the linear assumptions. KEYWORDSgeometric nonlinearity, structural dynamics, wind energy, wind turbine aeroelasticity, wind turbine loads INTRODUCTIONThe wind turbine design process requires a wide range of different simulations including load and stability analysis and design optimization.Although, some analyses need models with only one uncoupled turbine property such as aerodynamic and structure, others need coupled models which have couplings between the structure, the aerodynamics, and the controller. Coupled turbine analyses generally use low fidelity models because of the high computational cost and difficulties in the coupling process. For example, turbine load analyses are generally performed by the blade element momentum (BEM) 1 method for the aerodynamic part and beam solvers or reduced order models for the structural part. The structural model can be geometrically linear or nonlinear depending on the solver capabilities and available computation resources. The focus of this study is to assess the capabilities of using linear mode shapes in reduced order structural models in stability, aeroelastic, and load analysis of modern turbines.Linear modes constitute a simple and fundamental modeling alternative for most of the linear dynamic problems. Small size, cost effective, and reliable reduced order models 2-6 can be constructed by the mode shapes to calculate the structural response. It is also the key part of the stability analysis. Therefore, reduced order models are also preferred in wind turbine load and stability analysis. 7,8 Although, these models work very well for the structures with small deflections, their accuracy decreases as...

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Reduced basis methods for structurally nonlinear Joined Wings

Cited by 7 publications

References 20 publications

A Technique for Time Integration With Steps Larger Than the Excitation Steps: Review of the Past and Addressing the Existing Challenges and a Perspective of the Future

A Technique for Time Integration With Steps Larger Than the Excitation Steps: Review of the Past and Addressing the Existing Challenges and a Perspective of the Future

Nonlinear reduced order modeling for nonlinear response simulation of panels via Large Eddy Simulation

Representation of wind turbine blade responses in power production load cases by linear mode shapes

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