Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Analysis of a wind turbine foundation on stiff clay with analytical and 3D finite element methods
Download
index.pdf
Date
2019
Author
Yaşar, Baki Eren
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
310
views
215
downloads
Cite This
Optimum design of onshore wind turbine foundations have been a topic of interest in geotechnical engineering in recent decades. However, the literature is lacking a systematic methodology for the design of onshore wind turbine foundations with three-dimensional finite element method (3D FEM) and a practical study evaluating the factors affecting the foundation design. The goals of this study are (i) to present a comprehensive design procedure by summarizing the literature, (ii) to investigate the key issues for the design of onshore wind turbine foundations using 3D FEM and (iii) to highlight the important factors for ensuring both safe and economical design. For these purposes, a wind turbine with 1.5 MW capacity on stiff clay was taken as a case study and the analyses of the foundation (in terms of bearing capacity, overturning, sliding, rocking stiffness, elastic settlement and rotation) were conducted using analytical method, probabilistic method using Monte Carlo simulation, and 3D FEM. In conclusion, to calculate the settlement and rotation of wind turbine foundations accurately, using 3D finite element analysis was recommended instead of analytical method. Furthermore, the variation in foundation diameter and soil properties, i.e., different coefficient of variation (COV) levels, on satisfactory performance was evaluated. It was noted that the increase of COV level causes an increase in the probability of unsatisfactory performance of the foundation. This study demonstrates a foundation design methodology for practicing engineers and will be useful to reach robust, safe and economical foundation design for wind turbines considering the variability in soil properties.
Subject Keywords
Wind power.
,
Onshore Wind Turbine Foundation
,
Monte Carlo
,
Three Dimensional Finite Element Method
,
Plaxis 3D.
URI
http://etd.lib.metu.edu.tr/upload/12624853/index.pdf
https://hdl.handle.net/11511/45398
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Delamination-Debond Behaviour of Composite T-Joints in Wind Turbine Blades
Gulasik, H.; Çöker, Demirkan (2014-06-20)
Wind turbine industry utilizes composite materials in turbine blade structural designs because of their high strength/stiffness to weight ratio. T-joint is one of the design configurations of composite wind turbine blades. T-joints consist of a skin panel and a stiffener co-bonded or co-cured together with a filler material between them. T-joints are prone to delaminations between skin/stiffener plies and debonds between skin-stiffener-filler interfaces. In this study, delamination/debond behavior of a co-b...
STATIC ANALYSIS OF A COMPOSITE WIND TURBINE BLADE USING FINITE ELEMENT MODEL
Ozyildiz, Meltem; Çöker, Demirkan (2017-05-17)
This study is presented here that the stress characteristics of an existing 5-meter composite wind turbine blade for 30 kW wind turbine designed for METUWIND is known by using finite element method. Modal and static analysis is performed in order to obtain static and dynamic behavior of the blade. To perform analysis, the geometric three-dimensional model of the blade is obtained by using two-dimensional drawings of the blade. After geometric modeling of the blade, the materials that are used in blade struc...
Comparative study of transient and quasi-steady aeroelastic analysis of composite wind turbine blade in steady wind conditions
Sargın, Hakan; Kayran, Altan; Department of Aerospace Engineering (2014)
The objective of this study is to conduct a comparative study of the transient and quasi-steady aeroelastic analysis of a composite wind turbine blade in steady wind conditions. Transient analysis of the wind turbine blade is performed by the multi-body dynamic code Samcef Wind Turbine which uses blade element momentum theory for aerodynamic load calculation. For this purpose, a multi-body wind turbine model is generated with rigid components except for the turbine blades. For the purposes of the study, a r...
Development of a high fidelity finite element model of a wind turbine blade via modal testing
Amer, Chadi; Şahin, Melin; Department of Aerospace Engineering (2015)
The design of an optimised horizontal axis 5-meter-long wind turbine rotor blade, is a research and development project, in order to fulfil the requirements of high efficiency torque-from-wind production. For this purpose, a research study is presented here, by investigating the structural characteristics of a composite wind turbine blade via finite element modelling and experimental modal analysis. At first, modal tests are performed by using various sensor-actuator pair combinations. After that the geomet...
Investigation of the effect of bending twisting coupling on the loads in wind turbines with superelement blade definition
Gözcü, Mehmet Ozan; Kayran, Altan; Department of Aerospace Engineering (2014)
In this thesis study, the effect of off-axis plies in the spar caps of a wind turbine blade on the damage equivalent loads in a wind turbine system is investigated. The off-axis plies in the spar caps are exploited for load alleviation in the whole turbine system since the off-axis plies induced bending-twisting coupling into blades of wind turbine. Damage equivalent load is used to assess the effect of bend twist coupled blade on the fatigue load reduction in the whole wind turbine system. NREL's 5 MW turb...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
B. E. Yaşar, “Analysis of a wind turbine foundation on stiff clay with analytical and 3D finite element methods,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.