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.

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.

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.

scholarly journals A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

2020 ◽  
pp. 1-14
Author(s):  
Marcin Augustyn
Keyword(s):  
Boundary Layer ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Computational Procedure ◽  
Horizontal Axis ◽  
The Self ◽  
Main Rotor ◽  
Aerodynamic Coefficients ◽  
Horizontal Axis Wind Turbine ◽  
Design Structure

The proposed self-adjusting mechanism consists of a carousel rotor with a vertical axis consisting of two kinematically connected flat blades. The torque of this rotor can change the position of the directing unit and additionally the position of the main propeller in order to direct the wind stream or save the main rotor when the wind is too strong. The theory, principles of operation, and the properties of the self-adjusting system were illustrated by formulas and graphs. Based on research conducted in a boundary layer wind tunnel, the values of the aerodynamic coefficients of the flat blades were determined, and then the power and propeller torque of the rotor were found as a function of the angle of wind attack. A computational procedure provides kinematical and force relations as well as the resulting torque diagrams of the rotor. An example of the use and the design structure of a self-adjusting unit in the case of a horizontal axis wind turbine is presented.

scholarly journals Analysis of Near-Wake Deflection Characteristics of Horizontal Axis Wind Turbine Tower under Yaw State

2021 ◽  
Vol 118 (6) ◽  
pp. 1627-1640
Author(s):  
Zhen Liu ◽  
Jianwen Wang ◽  
Fuzhong Bai ◽  
Caifeng Wen ◽  
Yunchao Du
Keyword(s):  
Wind Turbine ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Near Wake ◽  
Wind Turbine Tower
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