Sensitivity analysis of offshore wind turbine tower caused by the external force

2013 ◽  
Vol 17 (5) ◽  
pp. 859-864 ◽  
Author(s):  
Namhyeong Kim ◽  
Jung Woon Jin
Keyword(s):  
Sensitivity Analysis ◽  
Wind Turbine ◽  
External Force ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wind Turbine Tower

Dynamic Modeling and Simulation of a Spar Floating Offshore Wind Turbine With Consideration of the Rotor Speed Variations

2019 ◽  
Vol 141 (8) ◽  
Author(s):  
Mohammed Khair Al-Solihat ◽  
Meyer Nahon ◽  
Kamran Behdinan
Keyword(s):  
System Dynamics ◽  
Wind Turbine ◽  
Torque Control ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Aerodynamic Load ◽  
Floating Platform ◽  
Dynamic Simulations ◽  
Floating Offshore Wind Turbine ◽  
Wind Turbine Tower

This paper presents a rigid multibody dynamic model to simulate the dynamic response of a spar floating offshore wind turbine (FOWT). The system consists of a spar floating platform, the moorings, the wind turbine tower, nacelle, and the rotor. The spar platform is modeled as a six degrees-of-freedom (6DOFs) rigid body subject to buoyancy, hydrodynamic and moorings loads. The wind turbine tower supports rigid nacelle and rotor at the tip. The rigid rotor is modeled as a disk spinning around its axis and subject to the aerodynamic load. The generator torque control law is incorporated into the system dynamics to capture the rotor spinning speed response when the turbine is operating below the rated wind speed. The equations of motions are derived using Lagrange's equation in terms of the platform quasi-coordinates and rotor spin speed. The external loads due to hydrostatics, hydrodynamics, and aerodynamics are formulated and incorporated into the equations of motion. The dynamic simulations of the spar FOWT are performed for three load cases to examine the system eigen frequencies, free decay response, and response to a combined wave and wind load. The results obtained from the present model are validated against their counterparts obtained from other simulation tools, namely, FAST, HAWC2, and Bladed, with excellent agreement. Finally, the influence of the rotor gyroscopic moment on the system dynamics is investigated.

scholarly journals Damping of Offshore Wind Turbine Tower Vibrations by a Stroke Amplifying Brace

2014 ◽  
Vol 53 ◽  
pp. 258-267 ◽  
Author(s):  
Mark L. Brodersen ◽  
Jan Høgsberg
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wind Turbine Tower

scholarly journals Nonlinear Structural Control Analysis of an Offshore Wind Turbine Tower System

Processes ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 22 ◽  
Author(s):  
Y. Hamed ◽  
Ayman A. Aly ◽  
B. Saleh ◽  
Ageel F. Alogla ◽  
Awad M. Aljuaid ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Nonlinear Oscillations ◽  
Oscillation Amplitude ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Control Analysis ◽  
Control Force ◽  
Wind Turbine System ◽  
Wind Turbine Tower ◽  
Tower System

This paper investigates the vibration control, stability, and energy transfer of the offshore wind turbine tower system with control force and nonlinearity terms. A nonlinear proportional derivative (NPD) controller was connected to the system to reduce a high oscillation amplitude and to transfer the energy in the wind turbine system. Furthermore, the averaging method and Poincaré maps were used with respect to the controlled system to study the stability and bifurcation analysis in the worst resonance cases. The curves of force response and frequency response were plotted before and after the control unit was added to the wind turbine system. In addition, we discuss the performances of the control parameters on the vibration magnitudes. Numerical simulations were carried out with Maple and Matlab algorithms to confirm the analytical results. The results show the effectiveness of the NPD controller in suppressing the nonlinear oscillations of the wind turbine system.

Load Analysis of 2.5MW Offshore Wind Turbine Tower

2011 ◽  
Vol 121-126 ◽  
pp. 206-212
Author(s):  
Cai Yun Ji ◽  
Long Biao Zhu ◽  
Zhi Song Zhu
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Irregular Waves ◽  
Offshore Wind Turbine ◽  
Response Analysis ◽  
Linear Wave ◽  
Load Spectrum ◽  
Wave Load ◽  
Wind Turbine Tower ◽  
Load Analysis

With the rapid development of wind power industry and the increasing tension of land resources, WTGS(Wind turbine generating set) changes from Onshore wind machine to offshore wind machine. Because the offshore wind turbine works in the complex environment, it is a higher challenge for tower security. This paper focuses on the load analysis of 2.5MW wind turbine tower, in which a segment solution is applied. Wind load is solved in the superior segment of tower. In the lower segment, the coupling factor of wind and wave is taken into account. Irregular waves are simulated on the basis of the linear wave theory, and then wave load is derived. Accordingly, loads on the tower are calculated by using MATLAB software, and the load spectrum of every node is drawn, which lays a foundation for the dynamic response analysis and fatigue life analysis of tower.

Sign in / Sign up

Export Citation Format

Share Document