Dynamic Analysis of Wind Turbine Tower-Foundation with Stiffeners

2013 ◽  
Vol 431 ◽  
pp. 126-131
Author(s):  
Xi Song ◽  
Jie Yu Li ◽  
Bo Wang
Keyword(s):  
Wind Turbine ◽  
Natural Frequency ◽  
Optimization Design ◽  
Finite Element Models ◽  
Horizontal Axis Wind Turbine ◽  
First Order ◽  
Wind Turbine Tower ◽  
Longitudinal Stiffeners ◽  
Tower Foundation ◽  
Orthogonal Stiffeners

In the light of the geometric characteristics of wind turbine and the distribution of stiffeners, the finite element models for the megawatt horizontal axis wind turbine are established by ANSYS. A model analysis is made of the effect of the foundation stiffness, longitudinal stiffeners, ring stiffeners and orthogonal stiffeners on natural frequency and vibration mode of the tower. The results show that the foundation stiffness and stiffeners all have a certain influence on the natural frequency of the tower. There is a 7% difference in the first-order natural frequency between the models of the tower with and without foundation stiffness; there is an increase in natural frequency of the tower when longitudinal stiffeners or orthogonal stiffeners are considered, while natural frequency of the tower experiences an erratic change with the increase of ring stiffeners. The present study will provide some theoretical basis for the optimization design of wind turbines.

Vibration Characteristics Analysis of Wind Turbine Towers under Foundation Conditions

2013 ◽  
Vol 446-447 ◽  
pp. 721-727
Author(s):  
Xi Song ◽  
Yin Guang Wu ◽  
Jie Yu Li ◽  
Rong Zhen Zhao
Keyword(s):  
Dynamic Analysis ◽  
Wind Turbine ◽  
Natural Frequency ◽  
Large Scale ◽  
Horizontal Axis Wind Turbine ◽  
Static And Dynamic Analysis ◽  
Wind Turbine Tower ◽  
Characteristics Analysis ◽  
Wind Turbine Towers ◽  
Tower Foundation

Based on a kind of 1.5MW large-scale horizontal axis wind turbine tower, the mechanical modeling of a wind turbine tower-foundation is established, the static and dynamic analysis of the model is carried out by ANSYS software. The top displacement of the system is calculated by the static analysis to meet the design requirements in engineering. In dynamic analysis, each pile foundation is equivalent to a group of springs for the simulation of horizontal and vertical rigidity of the pile. The influence of top mass and foundation elasticity on wind turbine tower modes is analyzed, and calculated the natural frequency of the tower within a certain scope of rigidity in different directions about the piles foundation. The results show that the natural frequency of the wind turbine tower is influenced significantly by the mass on the tower top and foundation rigidity. The study provides a theoretical basis for optimal design of the wind turbine.

Modal Analysis of the 1.5MW Wind Turbine Tower

2013 ◽  
Vol 712-715 ◽  
pp. 1494-1500
Author(s):  
Bi Feng Cao ◽  
Hui Yu
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Excitation Frequency ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Finite Element Software ◽  
Wind Turbine Tower ◽  
Tower Model

The paper uses the finite element software ANSYS to establish a 1.5 MW horizontal-axis wind turbine tower model as an example and works on the modal analysis. The modal analysis takes into account the totalmass of wind rotor and nacelle and assumes the bottom of the wind turbine tower is fully constrained. The result shows that the natural frequency of the 1.5MW wind turbine tower is not coincident with the excitation frequency of the wind turbine, and the wind turbine can operate stably at the design condition.

Numerical Study of Superharmonic Resonances in a Mistuned Horizontal-Axis Wind-Turbine Blade-Rotor Set

2019 ◽  
Author(s):  
Ayse Sapmaz ◽  
Gizem D. Acar ◽  
Brian F. Feeny
Keyword(s):  
Wind Turbine ◽  
Initial Conditions ◽  
Numerical Study ◽  
Horizontal Axis ◽  
Rotor Speed ◽  
Horizontal Axis Wind Turbine ◽  
First Order ◽  
Direct Excitation ◽  
Rotor Angle ◽  
Perturbation Solutions

Abstract This paper is on a simplified model of an in-plane blade-hub dynamics of a horizontal-axis wind turbine with a mistuned blade. The model has cyclic parametric and direct excitation due to gravity and aerodynamics. This work follows up a previous perturbation study applied to the blade equations written in the rotor-angle domain and decoupled from the hub, in which superharmonic and primary resonances were analyzed. In this work, the effects of mistuning, damping, and forcing level are illustrated. The first-order perturbation solutions are verified with comparisons to numerical simulations at superharmonic resonance of order two. Additionally, the effect of rotor loading on the rotor speed and blade amplitudes is investigated for different initial conditions and mistuning cases.

Research on the Door Buckling Strength of Turbine Tower of HAWTs

2012 ◽  
Vol 268-270 ◽  
pp. 1239-1243
Author(s):  
Kai Long ◽  
Ji Xiu Wu
Keyword(s):  
Wind Turbine ◽  
Large Scale ◽  
Horizontal Axis ◽  
Engineering Method ◽  
Fe Model ◽  
Horizontal Axis Wind Turbine ◽  
Buckling Modes ◽  
Buckling Strength ◽  
Design Structure ◽  
Wind Turbine Tower

In order to realize the buckling strength design for the opening door of the large-scale horizontal axis wind turbine tower, the method combined with the engineering method and the FEM was presented. The FE model of the door was established. The first-order buckling eigenvalues and buckling modes for three different structures were calculated and analyzed. Based on engineering method, the stress and buckling strength for the sections of tubular tower were obtained. Corrected by FEM results, the tower door with opening buckling strength were checked by engineering method. The results were compared with those by FEM. The safe design structure anti-buckling were presented. The method presented in this paper is feasible and effective for the opening door design in large-scale horizontal axis wind turbine tower.

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