Offshore wind turbines: Basis of Structural Design

2009 ◽  
Author(s):  
K. Gkoumas ◽  
F. Petrini ◽  
S. Manenti ◽  
F. Bontempi
Keyword(s):  
Wind Turbines ◽  
Structural Design ◽  
Offshore Wind ◽  
Offshore Wind Turbines

Influence of structural design variations on economic viability of offshore wind turbines: An interdisciplinary analysis

2020 ◽  
Vol 145 ◽  
pp. 1348-1360 ◽  
Author(s):  
Clemens Hübler ◽  
Jan-Hendrik Piel ◽  
Chris Stetter ◽  
Cristian G. Gebhardt ◽  
Michael H. Breitner ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Structural Design ◽  
Offshore Wind ◽  
Economic Viability ◽  
Offshore Wind Turbines

Structural Design and Analysis of Offshore Wind Turbines from a System Point of View

2010 ◽  
Vol 34 (1) ◽  
pp. 85-107 ◽  
Author(s):  
Francesco Petrini ◽  
Sauro Manenti ◽  
Konstantinos Gkoumas ◽  
Franco Bontempi
Keyword(s):  
Wind Turbines ◽  
Structural Design ◽  
Point Of View ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
System Point

A Study on Structural Responses of Offshore Wind Turbines by Slamming Loads

2018 ◽  
Author(s):  
Byoungcheon Seo ◽  
Hyunkyoung Shin ◽  
Junbae Kim ◽  
Woorim Shim ◽  
Hyeonjeong Ahn ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Structural Design ◽  
Structural Damage ◽  
Large Scale ◽  
Offshore Structures ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Design Life ◽  
Slamming Load

Offshore structures operating at sea are severely affected by slamming pressure. This slamming pressure significantly shortens the design life of offshore structures including offshore wind turbines and results in personal and material damage. This slamming load has to be fully considered in the design phase of the structure, and therefore good quality of experimental results should be supported. In Korea, offshore wind turbines have excellent conditions geographically. In the West sea, the construction of the jacket-type wind turbine is advantageous because the water depth is low, and in the East sea, which is relatively deep, the floating wind turbine is possible; thus, it is easy to generate a large-scale wind farm. For offshore wind turbines, several technical aspects should be considered. Among them, the damage of the structure caused by the slamming load should be studied. In the case of FOWTs operating in large waves, slamming can cause structural damage, and repeated slamming loads reduce the structural strength and shorten the design life. The slamming load should be calculated by applying the maximum peak, its width, duration and the dynamic load according to the natural period of the structure, and the importance of structural design. The results of the experiments can be used to determine the structural design, and the slamming load can be estimated to provide the design techniques offshore wind turbines as the design variables. In this study, we investigated experimentally the elastic effects of a cylindrical model on the slamming load characteristics by free drop test at height 1.0m and 1.7m.

Pitch Angle Control of Floating Offshore Wind Turbines by H∞ Control

2014 ◽  
Vol 134 (8) ◽  
pp. 1096-1103 ◽  
Author(s):  
Sho Tsujimoto ◽  
Ségolène Dessort ◽  
Naoyuki Hara ◽  
Keiji Konishi
Keyword(s):  
Wind Turbines ◽  
Pitch Angle ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines

scholarly journals Maintenance Planning of Offshore Wind Turbine Using Condition Monitoring Information

2009 ◽  
Author(s):  
Jose´ G. Rangel-Rami´rez ◽  
John D. So̸rensen
Keyword(s):  
Condition Monitoring ◽  
Wind Turbines ◽  
Wind Farm ◽  
Offshore Structures ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Maintenance Planning ◽  
Offshore Wind Turbines ◽  
Inspection And Maintenance ◽  
Monitoring Information

Deterioration processes such as fatigue and corrosion are typically affecting offshore structures. To “control” this deterioration, inspection and maintenance activities are developed. Probabilistic methodologies represent an important tool to identify the suitable strategy to inspect and control the deterioration in structures such as offshore wind turbines (OWT). Besides these methods, the integration of condition monitoring information (CMI) can optimize the mitigation activities as an updating tool. In this paper, a framework for risk-based inspection and maintenance planning (RBI) is applied for OWT incorporating CMI, addressing this analysis to fatigue prone details in welded steel joints at jacket or tripod steel support structures for offshore wind turbines. The increase of turbulence in wind farms is taken into account by using a code-based turbulence model. Further, additional modes t integrate CMI in the RBI approach for optimal planning of inspection and maintenance. As part of the results, the life cycle reliabilities and inspection times are calculated, showing that earlier inspections are needed at in-wind farm sites. This is expected due to the wake turbulence increasing the wind load. With the integration of CMI by means Bayesian inference, a slightly change of first inspection times are coming up, influenced by the reduction of the uncertainty and harsher or milder external agents.

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.

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