Experiment study of dynamics response for wind turbine system of floating foundation

2015 ◽  
Vol 29 (6) ◽  
pp. 835-846 ◽  
Author(s):  
You-gang Tang ◽  
Kai Song ◽  
Bin Wang
Keyword(s):  
Wind Turbine ◽  
Experiment Study ◽  
Floating Foundation ◽  
Wind Turbine System ◽  
Dynamics Response

Study on the Dynamic Response for Floating Foundation of Offshore Wind Turbine

2011 ◽  
Author(s):  
Yougang Tang ◽  
Jun Hu ◽  
Liqin Liu
Keyword(s):  
Wind Turbine ◽  
Wind Farm ◽  
Dynamic Responses ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wave Load ◽  
Mooring Lines ◽  
Floating Foundation ◽  
Wind Turbine System ◽  
Sea Area

The wind resources for ocean power generation are mostly distributed in sea areas with the distance of 5–50km from coastline, whose water depth are generally over 20m. To improve ocean power output and economic benefit of offshore wind farm, it is necessary to choose floating foundation for offshore wind turbine. According to the basic data of a 600kW wind turbine with a horizontal shaft, the tower, semi-submersible foundation and mooring system are designed in the 60-meter-deep sea area. Precise finite element models of the floating wind turbine system are established, including mooring lines, floating foundation, tower and wind turbine. Dynamic responses for the floating foundation of offshore wind turbine are investigated under wave load in frequency domain.

Research on the Dynamic Response of Floating Foundation of a Tri-Floater Offshore Wind Turbine

2013 ◽  
Vol 275-277 ◽  
pp. 852-855 ◽  
Author(s):  
Zhuang Le Yao ◽  
Chao He Chen ◽  
Yuan Ming Chen
Keyword(s):  
Wind Turbine ◽  
Transfer Functions ◽  
Reference Value ◽  
Element Model ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wave Load ◽  
Floating Foundation ◽  
Wind Turbine System ◽  
Offshore Wind Industry

In this paper, the overall finite element model is established, to analyze the small-sized floating foundation of a tri-floater and to make a local optimization on the stress concentration area. The transfer functions and the response spectrums of wave load and motion of floating wind turbine system are calculated by AQWA. Besides the concept of the floating foundation group is put forward in this paper. It is small in structure, easy to assemble, and it can be developed for any power of wind field.This concept has a certain reference value for the development of offshore wind industry in China.

The Dynamic Response of Floating Foundation for 1.5MW Wind Turbine in 30m Water Depth

2014 ◽  
Author(s):  
Yougang Tang ◽  
Han Wang ◽  
Jiawen Li ◽  
Bin Wang ◽  
Wei Li
Keyword(s):  
Wind Turbine ◽  
Water Depth ◽  
Mooring Lines ◽  
Natural Motion ◽  
Damping Characteristics ◽  
Floating Foundation ◽  
Wind Turbine System ◽  
Motion Responses ◽  
Bem Theory ◽  
Blade Element

The floating foundation is designed to support a 1.5MW wind turbine in 30m water depth. Considering the viscous damping of foundation and heave plates, the amplitude-frequency responses characteristics of the foundation are studied. Taking the elastic effect of blades and tower, the classic quasi-steady blade-element/ momentum (BEM) theory is used to calculate the aerodynamic elastic loads. Coupled dynamic model of turbine-foundation-mooring lines is built to calculate the motion response of floating foundation under Kaimal wind spectrum and regular wave by using the FAST codes. The model experiment is carried out to test damping characteristics and natural motion behaviors of wind turbine system, as well as the motion responses considering joint of wind and wave and only with wave. It is shown that the wind turbine system can avoid the harmonic vibration by the wind and wave, in addition, the floating foundation heave is induced by wave, while surge motion is induced by wind, and the action of wind and wave is of significance for pitch.

Dynamic Modeling of H-Type Floating VAWT Considering the Rigid-Flexible Coupling Motions

2018 ◽  
Author(s):  
Wanru Deng ◽  
Xifeng Gao ◽  
Liqin Liu ◽  
Haixiang Zhao
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Frequency Component ◽  
Dynamic Responses ◽  
Wave Forces ◽  
Subsequent Work ◽  
Flexible Bodies ◽  
Main Frequency ◽  
Floating Foundation ◽  
Wind Turbine System

Dynamical characteristics of the H-type floating VAWT (vertical axis wind turbine) were studied. The wind turbine blades and the tower were treated as flexible bodies, and the floating foundation was treated as the rigid body. Considering the nonlinear deformations of the flexible bodies, the Lagrangian equation was used to establish the dynamic equations of wind turbine system. The loads included the wave forces, the wind loads, the mooring forces and the damping forces of the wind turbine system. A numerical calculation code was developed and verified. The innovation of the code is the coupling of rigid-flexible-aerodynamic-hydrodynamic of the floating wind turbine system. Taking the 5MW wind turbine as an example, the directions of the wind and the wave were considered as the same. Then the dynamic responses of the floating foundation, the tower and the blades were calculated. The results show that the wave frequency is the main frequency component of the responses of pitch, heave and surge of the floating foundation. 2P frequency (P is the rotational frequency of the wind turbine) accounts for a higher proportion for the sway, roll and yaw of the floating foundation. 2P and 4P are the main frequency components of the tower motions. 1P is the main frequency component of the blades’ motions. The 2nd mode of the blades and tower are considered. In the following research, the higher modes should be considered to improve the calculation accuracy. Besides, the model test is needed to verify the model further in the subsequent work.

scholarly journals Improving the Strategy of Maintaining Offshore Wind Turbines through Petri Net Modelling

2021 ◽  
Vol 11 (2) ◽  
pp. 574
Author(s):  
Rundong Yan ◽  
Sarah Dunnett
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Petri Net ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Maintenance Costs ◽  
Offshore Wind Turbines ◽  
Major Repair ◽  
Wind Turbine System ◽  
Periodic Maintenance

In order to improve the operation and maintenance (O&M) of offshore wind turbines, a new Petri net (PN)-based offshore wind turbine maintenance model is developed in this paper to simulate the O&M activities in an offshore wind farm. With the aid of the PN model developed, three new potential wind turbine maintenance strategies are studied. They are (1) carrying out periodic maintenance of the wind turbine components at different frequencies according to their specific reliability features; (2) conducting a full inspection of the entire wind turbine system following a major repair; and (3) equipping the wind turbine with a condition monitoring system (CMS) that has powerful fault detection capability. From the research results, it is found that periodic maintenance is essential, but in order to ensure that the turbine is operated economically, this maintenance needs to be carried out at an optimal frequency. Conducting a full inspection of the entire wind turbine system following a major repair enables efficient utilisation of the maintenance resources. If periodic maintenance is performed infrequently, this measure leads to less unexpected shutdowns, lower downtime, and lower maintenance costs. It has been shown that to install the wind turbine with a CMS is helpful to relieve the burden of periodic maintenance. Moreover, the higher the quality of the CMS, the more the downtime and maintenance costs can be reduced. However, the cost of the CMS needs to be considered, as a high cost may make the operation of the offshore wind turbine uneconomical.

scholarly journals Experimental and simulation-based analysis of asymmetrical spherical roller bearings as main bearings for wind turbines

2021 ◽  
Author(s):  
Amin Loriemi ◽  
Georg Jacobs ◽  
Sebastian Reisch ◽  
Dennis Bosse ◽  
Tim Schröder
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Measurement Data ◽  
Contact Angles ◽  
Suspension System ◽  
Roller Bearings ◽  
Axial Forces ◽  
Wind Turbine System ◽  
Bearing Life ◽  
The Individual

AbstractSymmetrical spherical roller bearings (SSRB) used as main bearings for wind turbines are known for their high load carrying capacity. Nevertheless, even designed after state-of-the-art guidelines premature failures of this bearing type occur. One promising solution to overcome this problem are asymmetrical spherical roller bearings (ASRB). Using ASRB the contact angles of the two bearing rows can be adjusted individually to the load situation occurring during operation. In this study the differences between symmetrical and asymmetrical spherical roller bearings are analyzed using the finite element method (FEM). Therefore, FEM models for a three point suspension system of a wind turbine including both bearings types are developed. These FEM models are validated with measurement data gained at a full-size wind turbine system test bench. Taking into account the design loads of the investigated wind turbine it is shown that the use of an ASRB leads to a more uniform load distribution on the individual bearing rows. Considering fatigue-induced damage an increase of the bearing life by 62% can be achieved. Regarding interactions with other components of the rotor suspension system it can be stated that the transfer of axial forces into the gearbox is decreased significantly.

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