scholarly journals Influence of the Flexible Tower on Aeroelastic Loads of the Wind Turbine

2021 ◽  
Vol 11 (19) ◽  
pp. 8876
Author(s):  
Junbo Hao ◽  
Zedong Wang ◽  
Wenwu Yi ◽  
Yan Chen ◽  
Jiyao Chen
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Dynamic Behavior ◽  
Energy Utilization ◽  
Aerodynamic Load ◽  
Characteristic Matrix ◽  
Element Discretization ◽  
Vibration Time ◽  
Tower Vibration ◽  
Tower System

The finite element discretization of a tower system based on the two-node Euler-Bernoulli beam is carried out by taking the cubic Hermite polynomial as the form function of the beam unit, calculating the structural characteristic matrix of the tower system, and establishing the wind turbine-nacelle-tower multi-degree-of-freedom finite element numerical model. The equation for calculating the aerodynamic load for any nacelle attitude angle is derived. The effect of the flexible tower vibration feedback on the aerodynamic load of the wind turbine is studied. The results show that, when the stiffness of the tower is large, the effect of having tower vibration feedback or not on the aeroelastic load of the wind turbine is small. For the more flexible tower system, wind-induced vibration time-varying feedback will cause larger aeroelastic load variations, especially the top of the tower overturning moment, thus causing a larger impact on the dynamic behavior of the tower downwind and crosswind. As the flexibility of the tower system increases, the interaction between tower vibration and pneumatic load is also gradually increasing. Taking into account the influence of flexible towers on the aeroelastic load of a wind turbine can help predict the pneumatic load of a wind turbine more accurately and improve the efficiency of wind energy utilization on the one hand and analyze the dynamic behavior of the flexible structure of a wind turbine more accurately on the other hand, which is extremely beneficial to the structural optimization of wind turbine.

scholarly journals Influence of the Flexible Tower on Aeroelastic Loads of the Wind Turbine

2021 ◽  
Author(s):  
Junbo Hao ◽  
Zedong Wang ◽  
Wenwu Yi ◽  
Yan Chen ◽  
Jiyao Chen
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Dynamic Behavior ◽  
Optimization Design ◽  
Energy Utilization ◽  
Aerodynamic Load ◽  
Characteristic Matrix ◽  
Tower Vibration ◽  
The Impact ◽  
Tower System

Based on the two-node Euler-Bernoulli beam, the tower system is discretized by finite element method, and the cubic Hermite polynomial is taken as the shape function of the beam element, and the structural characteristic matrix of the tower system is calculated, and the wind turbine-nacelle-tower multi-degree of freedom is established Finite element numerical model. The aerodynamic load calculation formula for any nacelle attitude angle is deduced. The influence of the vibration feedback of the flexible tower on the aerodynamic load of the wind turbine is studied. The results show that when the rigidity of the tower is large, the impact of tower vibration feedback on the aeroelastic load of the wind turbine is small. For a tower system with greater flexibility, the time-varying feedback of wind-induced vibration will cause greater aeroelastic load changes, especially the overturning moment of the tower top, which will cause a greater impact on the dynamic behavior of the tower in the downwind and crosswind directions. As the flexibility of the tower system increases, the interaction between tower vibration and aerodynamic load is gradually increasing. Taking the impact of the flexible tower on the aeroelastic load of the wind turbine into account, on the one hand, helps to predict the wind more accurately. The aerodynamic load of the wind turbine improves the efficiency of wind energy utilization. On the other hand, it can more accurately analyze the dynamic behavior of the flexible structure of the wind turbine, which is extremely beneficial to the structural optimization design of the wind turbine.

Static and Dynamic Characteristic Analysis of the Tower for Vertical Axis Wind Turbine Based on Finite Element Method

2012 ◽  
Vol 229-231 ◽  
pp. 613-616
Author(s):  
Yan Jue Gong ◽  
Yuan Yuan Zhang ◽  
Fu Zhao ◽  
Hui Yu Xiang ◽  
Chun Ling Meng ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wind Turbine ◽  
Dynamic Characteristic ◽  
Optimization Design ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Characteristic Analysis ◽  
Support Structure ◽  
Element Method

As an important part of the vertical axis wind turbine, the support structure should have high strength and stiffness. This article adopts finite element method to model a kind of tower structure of the vertical axis wind turbine and carry out static and modal analysis. The static and dynamic characteristic results of tower in this paper provide reference for optimization design the support structure of wind turbine further.

scholarly journals Closed loop control of aerodynamic load fluctuations on wind turbine airfoil using surface plasma actuators

2020 ◽  
Vol 53 (2) ◽  
pp. 12675-12681
Author(s):  
Dominique Nelson-Gruel ◽  
Pierrick Joseph ◽  
Alexis Paulh-Manssens ◽  
Annie Leroy ◽  
Sandrine Aubrun ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Closed Loop ◽  
Plasma Actuators ◽  
Aerodynamic Load ◽  
Closed Loop Control ◽  
Surface Plasma ◽  
Loop Control ◽  
Wind Turbine Airfoil
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