Exact controllability of a wind turbine tower model in the plane of the turbine blades

2010 ◽  
Author(s):  
Xiaowei Zhao ◽  
George Weiss
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Exact Controllability ◽  
Wind Turbine Tower ◽  
Tower Model

Identification of Modal Damping Ratios for a Simplified Wind Turbine Tower Using Fourier Analysis

2005 ◽  
Author(s):  
Paul J. Murtagh ◽  
Biswajit Basu ◽  
Brian M. Broderick
Keyword(s):  
Linear Regression ◽  
Fourier Analysis ◽  
Wind Turbine ◽  
Order Reduction ◽  
Coupled System ◽  
Degree Of Freedom ◽  
Modal Damping ◽  
Wind Turbine Tower ◽  
Tower Model ◽  
Forced Vibration Analysis

This paper presents an approach to evaluate the modal damping ratios for a simplified wind turbine tower, using Fourier analysis and linear regression. The model proposed for the wind turbine tower is composed of a flexible tower and rotor blade system, inter-connected using a sub-structuring technique, which facilitates the rotating blade/tower coupling. A model order reduction technique is first used to model each of the two sub-structures (tower/nacelle and rotor system) as single degree-of-freedom systems. The free vibration characteristics of the tower include the effects of a large nacelle mass at the towers free end, and the corresponding properties of the rotating blades include the effects of centrifugal stiffening and axial self-weight, due to rotation. Then, the two reduced order sub systems are then coupled together to form an equivalent two degree-of-freedom coupled tower/blade wind turbine tower model. A wind-induced forced vibration analysis of the coupled tower/blades model is carried out using artificially generated wind drag time-histories obtained as discrete Fourier transform representations of wind drag power spectral density functions. From this analysis, a method is proposed, based on Fourier analysis and the linear regression, to solve the inverse problem for evaluating the first and second modal damping ratios of the coupled system. A numerical example is presented in order to demonstrate the applicability of the proposed approach, where excellent agreement was observed between the originally specified modal damping ratios and the subsequently estimated ones. The proposed method can be extended to obtain the equivalent damping of the system with soil interaction and including aerodynamic damping.

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.

scholarly journals Influence of external loads to wind turbine tower

2021 ◽  
Vol 3 (2) ◽  
pp. 112-120
Author(s):  
Marin Petrovic ◽  
Nejra Isic
Keyword(s):  
Wind Turbine ◽  
Wind Velocity ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Steel Pipes ◽  
Wind Turbine Tower ◽  
Wind Turbine Towers ◽  
Lattice Towers ◽  
The Moment ◽  
External Loads

One of the most important parts of a wind turbine is a tower. There are various designs of the wind turbine towers, and they are most often made of steel pipes, lattice towers or concrete towers. In order to increase energy density to meet the growing electricity needs, larger wind turbine projects have been developed. Larger wind turbine towers can generate more electricity, but such large sizes also create higher costs in terms of development and maintenance. This research sets up a model of a wind turbine tower, where the load to the tower is calculated by its relation to the wind velocity. Analytical approach coupled with a finite element method (FEM) is used to analyse the distribution of tower stresses under these loads. The fatigue analysis of the column is performed using the load from its own weight, the weight of the housing and the distribution of the wind velocity. The effects of different loads are also compared. The results show that the main loads of the tower are the wind force acting on the area of ??rotation of the wind turbine blades and the moment caused by the uneven wind velocity. Construction is modelled using SolidWorks modelling package, where the analysis was performed using FEM in ANSYS software. As a result of the analysis, the stress distribution in the support was determined and compared with analytical calculations.

General Structure Configuration and Parametric Design Method of Wind Turbine Tower

2012 ◽  
Vol 487 ◽  
pp. 588-592
Author(s):  
Zhen Yun Duan ◽  
Xiao Jiao Liu ◽  
Tie Qiang Ma
Keyword(s):  
Wind Turbine ◽  
Parametric Design ◽  
Design Method ◽  
General Structure ◽  
3D Design ◽  
Wind Turbine Tower ◽  
Relation Model ◽  
Tower Model ◽  
Structure Configuration ◽  
Parameter Relation

In order to improve the design efficiency of wind turbine tower, a design method which combines configuration and parametric design is proposed, the general structure model of wind turbine tower is given, and the parameter relation model of tower components is established. Based on skeleton and coordinate system coincident method, the automatic assembly of 3D tower model is realized. An automated 3D design software system of wind turbine tower is built by the API of Pro/E. The validity of the system is proved by wind turbine SUT-1500.

Wind Turbine Tower Climbing System Design

2014 ◽  
Vol 915-916 ◽  
pp. 285-291
Author(s):  
Song Feng Tian ◽  
Ya Ning Zhu
Keyword(s):  
Wind Turbine ◽  
System Design ◽  
Experimental Verification ◽  
Turbine Blades ◽  
Labor Intensity ◽  
Wind Turbine Blades ◽  
Wind Turbine Tower ◽  
Inspection And Maintenance

Currently there is a certain degree of difficulty for China wind turbine blades and tower inspection and maintenance. In this paper, the design of wind turbine tower climbing system is mainly used in wind turbine blades and tower inspection and maintenance, which can replace altitude operations, reduce labor intensity of workers, improve the accuracy of inspection, and get experimental verification.

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