Novel Jacket Structure of Offshore Wind Turbines: Design, Analysis, and Experiment
Date Issued
2015
Date
2015
Author(s)
Lin, Yu-Hung
Abstract
There are several types of support structure in offshore wind turbine tower. How to choose them depends on water depth and soil situation of sea bed. Nowadays the demand of wind energy is increasing, so the development of offshore wind turbine has further expanded to deeper water depth region. Large fraction of wind turbine towers is built on the sea bed where the water depth ranges from 25 to 50 meter. Although most of the wind turbine tower structures in the world are monopole supported, many countries start to research on jacket structure. The purpose of present study is to design and analyses the most suitable support structure for 5MW offshore wind turbines in Taiwan. Based on reviewed literature, different types of general jacket structures model are built. New types of jacket structures are successfully designed, known as modified tripod jacket structures. In this thesis, 14 types of jacket structures models have been constructed using SOLIDWORK design software. The finite element analysis (Beam Element Analysis and Shell Element Analysis) and buckle analysis are performed using ABAQUS/CAE package software. In the experiment, MTS machine is used to perform the buckle test on small-scaled specimens. The experiments are conducted in two stages, first is to execute buckle test on the modified tripod solid structure. Second is to execute buckle test on steel hollow tube. The force-displacement data is measured and compared with the simulation results to evaluate the validity of the numerical method. CAE result shows that, 0°modified tripod jacket structure has better behavior under stress loading. In buckle test, 90°modified tripod jacket structure is good performed. These four designs of modified tripod jacket structures simplify the process of construction and reduce the construction cost. This is because modified tripod jacket structures have less braces and less welding points.
Subjects
Offshore Wind Turbine Tower
Jacket Structure
Finite Element Analysis
Buckle Analysis
Type
thesis
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