A multi-objective design optimization approach for floating offshore wind turbine support structures

2016 ◽  
Vol 3 (1) ◽  
pp. 69-87 ◽  
Author(s):  
Meysam Karimi ◽  
Matthew Hall ◽  
Brad Buckham ◽  
Curran Crawford
Keyword(s):  
Wind Turbine ◽  
Design Optimization ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Optimization Approach ◽  
Support Structures ◽  
Floating Offshore Wind Turbine ◽  
Multi Objective

scholarly journals Structural integrity assessment of floating offshore wind turbine support structures

2020 ◽  
Vol 208 ◽  
pp. 107487
Author(s):  
Behrooz Tafazzoli Moghaddam ◽  
Ali Mahboob Hamedany ◽  
Jessica Taylor ◽  
Ali Mehmanparast ◽  
Feargal Brennan ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Structural Integrity ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structures ◽  
Floating Offshore Wind Turbine ◽  
Integrity Assessment

scholarly journals Reducing the number of load cases for fatigue damage assessment of offshore wind turbine support structures using a simple severity-based sampling method

2018 ◽  
Vol 3 (2) ◽  
pp. 805-818 ◽  
Author(s):  
Lars Einar S. Stieng ◽  
Michael Muskulus
Keyword(s):  
Wind Turbine ◽  
Design Optimization ◽  
Fatigue Damage ◽  
Simple Procedure ◽  
Computational Effort ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structures ◽  
Fatigue Assessment ◽  
Operational Conditions

Abstract. The large amount of computational effort required for a full fatigue assessment of offshore wind turbine support structures under operational conditions can make these analyses prohibitive, especially for applications like design optimization, for which the analysis would have to be repeated for each iteration of the process. To combat this issue, we present a simple procedure for reducing the number of load cases required for an accurate fatigue assessment. After training on one full fatigue analysis of a base design, the method can be applied to establish a deterministic, reduced sampling set to be used for a family of related designs. The method is based on sorting the load cases by their severity, measured as the product of fatigue damage and probability of occurrence, and then calculating the relative error resulting from using only the most severe load cases to estimate the total fatigue damage. By assuming this error to be approximately constant, one can then estimate the fatigue damage of other designs using just these load cases. The method yields a maximum error of about 6 % when using around 30 load cases (out of 3647) and, for most cases, errors of less than 1 %–2 % can be expected for sample sizes in the range 15–60. One of the main points in favor of the method is its simplicity when compared to more advanced sampling-based approaches. Though there are possibilities for further improvements, the presented version of the method can be used without further modifications and is especially useful for design optimization and preliminary design. We end the paper by noting some possibilities for future work that extend or improve upon the method.

scholarly journals Design Optimization of Conical Concrete Support Structure for Offshore Wind Turbine

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4876
Author(s):  
Hyun-Gi Kim ◽  
Bum-Joon Kim
Keyword(s):  
Structural Analysis ◽  
Wind Turbine ◽  
Design Optimization ◽  
Time History ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structures ◽  
Support Structure ◽  
Analysis And Design ◽  
Natural Frequency Analysis

Various types of support structures for offshore wind turbine have been developed, and concrete structures have attracted attention due to many advantages. Although many studies have been conducted on the design of the existing steel structures, information and research on the design of concrete support structures are insufficient. Therefore, in this paper, a structural analysis model of conical concrete support structure (CCSS) is established and design optimization is presented. A detailed performance evaluation and the design of prestressed concrete were performed under the marine conditions of Phase 1 test site of southwest offshore wind project in Korea. The fluid–soil–structure interaction (FSI) was applied using the added mass method and soil spring model to represent the effects of water and soil. With the result of quasi-static analysis, a post-tensioning design was implemented by applying prestressing steel, and CCSS showed sufficient rigidity. From the natural frequency analysis, CCSS has a dynamic structural stability, and, in response spectrum and time-history analyses, the CCSS was safe enough under the earthquake loads. The methods and conclusions of this study can provide a theoretical reference for the structural analysis and design of concrete support structures for offshore wind turbines.

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