Feasibility of segmented concrete in wind turbine tower: Numerical studies on its mechanical performance

2020 ◽  
pp. 105678952095489
Author(s):  
Yanchao Yue ◽  
Jingjing Tian ◽  
Qingyi Mu ◽  
Tangbing Chen ◽  
Lin Peng ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Mechanical Performance ◽  
Cost Savings ◽  
Peak Stress ◽  
Element Model ◽  
Numerical Studies ◽  
Wind Turbine Tower ◽  
Low Elastic Modulus ◽  
Tower Structure

Segmented concrete slices have been widely used in the construction of wind turbine tower due to easy transportation and cost savings. Factors such as the size and form of the concrete slice and the connector may affect the stiffness and reliability of the structure. The objective of this study is to investigate the influence of the above factors on mechanical performance of a wind turbine tower. A finite element model of 40 m segmented concrete tower was developed for the modal analysis, and a local refinement model was established for the static analysis. Results show that the slice form and connectors have impact on the rigidity of the tower structure. Dividing the tower into two pieces per layer, increasing the height of the tower segment, using the grout connection of the longitudinal and staggering longitudinal seams can increase the stiffness of segmented concrete tower. In addition, this study analyzes the role of rubber pads in improving the mechanical performance of the tower, results show that the peak stress at the joints can be reduced by setting rubber pads with low elastic modulus at the longitudinal seams.

A Finite Element Model of a Wind Turbine Tower

2010 ◽  
Author(s):  
V. V. Pasheva ◽  
E. S. Chankov ◽  
G. I. Venkov ◽  
George Venkov ◽  
Vesela Pasheva ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wind Turbine ◽  
Element Model ◽  
Wind Turbine Tower

Numerical evaluation for vibration-based damage detection in wind turbine tower structure

2015 ◽  
Vol 21 (6) ◽  
pp. 657-675 ◽  
Author(s):  
Tuan-Cuong Nguyen ◽  
Thanh-Canh Huynh ◽  
Jeong-Tae Kim
Keyword(s):  
Damage Detection ◽  
Wind Turbine ◽  
Numerical Evaluation ◽  
Wind Turbine Tower ◽  
Tower Structure

Analysis and Design of Integrated Optimization of 1.5MW Wind Turbine Tower

2014 ◽  
Vol 971-973 ◽  
pp. 958-961
Author(s):  
Yong Zhi Xie ◽  
An Le Mu
Keyword(s):  
Mathematical Modeling ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Static Analysis ◽  
Optimization Algorithm ◽  
Parametric Modeling ◽  
Analysis And Design ◽  
Wind Turbine Tower ◽  
Tower Structure ◽  
Ansys Workbench

This paper uses Isight_FD 5.6 to integrate UG8.0 parametric modeling, ANSYS Workbench static analysis, modal analysis, and mathematical modeling of design optimization, by means of optimization algorithm, to meet strength and the stiffness of the tower, to realize the optimization of tower structure, so as to attain the expected target which reduces the weight of tower.

Modal Analysis of a Wind Turbine Tower Based on the Finite Element Method

2015 ◽  
Vol 744-746 ◽  
pp. 179-182
Author(s):  
Hong Zhu Shan ◽  
Zhen Hua Liu
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Excitation Frequency ◽  
Element Model ◽  
Direct Drive ◽  
The Finite Element Method ◽  
Wind Turbine Tower ◽  
Inherent Frequency ◽  
Generator Unit

For the low power wind turbine, the tower and the generator unit is easy to produce resonance, which will result in bigger amplitude. In this paper, as an example, the authors establish a finite element model for modal analysis by a 55kw direct-drive permanent-magnet generator, to confirm its inherent frequency and vibration mode. Horizontal amplitude on the top of the tower can be received under different external excitation frequency. The results correspond to the codes very well and can provide effective reference data for the design of the wind turbine tower.

Influence of Earthquake Directions on Wind Turbine Tower under Seismic Action

2011 ◽  
Vol 243-249 ◽  
pp. 3883-3888 ◽  
Author(s):  
Lai Wang ◽  
Xi Tong Dong
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Equations Of Motion ◽  
Element Model ◽  
Dynamic Responses ◽  
Dominant Factor ◽  
Seismic Action ◽  
Bending Stress ◽  
Wind Turbine System ◽  
Wind Turbine Tower

Influence of earthquake directions on wind turbine tower under seismic action are numerically investigated in this paper. First, equations of motion and an integrated finite element model of a wind turbine system consisting of a rotor, a nacelle and a tower shaft are established. Second, the finite element modal analysis is discussed. Third, relationships between upper displacements in x, y directions and bottom bending stress when the angle is 0, 30, 45, 60, 90 degree respectively between earthquake directions and concentrated eccentric mass direction (x direction) are analyzed by adjusted Taft seismic wave .The results show that: seismic responses of a wind turbine tower are remarkable and seismic action may be the dominant factor in the design of wind turbine towers that located at a seismically active zone. Under different earthquake directions structure’s dynamic responses are different, 90 degree with regard to x direction is the most unfavorable direction. Both maximum upper displacements in x, y directions and bottom bending stress appear at 90 degree direction with regard to x direction.

Operational Modal Analysis and Finite-Element Model Updating of Pilot Concrete Wind Turbine Tower

2019 ◽  
Vol 145 (2) ◽  
pp. 05018003
Author(s):  
Edilson Alexandre Camargo ◽  
Jens Peder Ulfkjaer ◽  
Rune Brincker ◽  
Jens Nøergaard ◽  
Simon Steen Gadegaard
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Model Updating ◽  
Element Model ◽  
Operational Modal Analysis ◽  
Finite Element Model Updating ◽  
Wind Turbine Tower

scholarly journals Seismic Vibration Mitigation of Wind Turbine Tower Using Bi-Directional Tuned Mass Dampers

2020 ◽  
Vol 2020 ◽  
pp. 1-22
Author(s):  
Wanrun Li ◽  
Qing Zhang ◽  
Zhou Yang ◽  
Qingxin Zhu ◽  
Yongfeng Du
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wind Turbine ◽  
Bending Moment ◽  
Element Model ◽  
Seismic Vibration ◽  
Lumped Mass ◽  
Tuned Mass Dampers ◽  
Vibration Mitigation ◽  
Wind Turbine Tower

Wind turbines have been increasingly erected in earthquake regions to harvest abundant wind energy. However, the wind turbine tower is slender and lightly damping, which exhibits high susceptibility to earthquake-induced vibration. It is challenging to mitigate the seismic vibration of the tower. In this study, a bi-directional tuned mass damper (BTMD) is proposed to mitigate the seismic vibration of the wind turbine tower. Meanwhile, a lumped-mass finite element model (LFEM) and a coupled blade tower finite element model (CBFEM) are used to investigate the vibration mitigation performance of the BTMD. First, the BTMD and corresponding dynamic equilibrium equations are systemically introduced. Accordingly, the optimum stiffness and damping of the BTMD at different mass ratios are investigated. Then, the dynamic prosperities of the LFEM and CBFEM are compared. Subsequently, the seismic responses of the wind turbine with the BTMD are conducted using the LFEM and CBFEM. Meanwhile, the mitigation performances of the BTMD under uni- and bi-directional earthquakes are investigated. The displacement, acceleration, and bending moment of the wind turbine tower are analyzed in time domain and frequency domain. Note that the influential factors, including mass ratio and structural frequency, on the vibration mitigation performance of the BTMD are investigated. Results show that the proposed BTMD can significantly mitigate the peak values of the top displacement and bottom bending moment. However, the blade tower coupling effect and frequency variation of the tower would have influences on the mitigation efficiency of the BTMD. The results enable a better understanding of the seismic vibration mitigation of the wind turbine tower using tuned mass dampers.

Research on the damage prediction method of offshore wind turbine tower structure based on improved neural network

Measurement ◽  
2020 ◽  
Vol 151 ◽  
pp. 107141 ◽  
Author(s):  
Binbin Qiu ◽  
Yang Lu ◽  
Liping Sun ◽  
Xianqiang Qu ◽  
Yanzhuo Xue ◽  
...  
Keyword(s):  
Neural Network ◽  
Wind Turbine ◽  
Prediction Method ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Damage Prediction ◽  
Wind Turbine Tower ◽  
Tower Structure

The Finite Element Analysis of the Large Horizontal Axis Wind Turbine Generator Tower

2013 ◽  
Vol 444-445 ◽  
pp. 836-840
Author(s):  
Wei Chen ◽  
Shi Yue Wang ◽  
Liang Cao ◽  
Hui Ming Wang ◽  
Ji Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Wind Turbine ◽  
Natural Frequencies ◽  
Element Model ◽  
Horizontal Axis Wind Turbine ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Wind Turbine Tower ◽  
Modes Of Vibration

Building finite element model of wind turbine tower, analyzing Static and modal of tower with using finite element analysis software ANSYS .Getting stress distribution, maximum displacement, natural frequencies and modes of vibration by finite element modal analysis of wind turbine tower and analyzing natural frequencies of wind turbine tower to determine whether to cause the tower and the wind wheel drive resonance.

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