Fatigue Analysis Of Basic Nodes Of Offshore Wind Power Jacket

In recent years,energy shortages have become an important problem for humanity all over the world.In today's globalization,the rapid development of science and technology in the world,followed by the growing demand for energy,conventional energy supply has become increasingly tense,so the development of new energy and renewable energy has become particularly important.Solar energy,wind energy and other renewable clean energy in the world has become more attention,including the development of offshore wind power is particularly evident.Offshore wind power,as a relatively new clean energy industry,is also developing more and more practical engineering problems at the same time.The offshore wind turbine consists of an upper fan and a lower support structure,the lower structure by the steel pipe is connected by welding.Because of its complex marine environment,in a variety of extreme sea conditions and external loads,under the base of the weld prone to stress concentration,leading to fatigue damage.Therefore,the bottom of the base weld design is the foundation of the difficulties and priorities.In order to ensure the normal operation of the fan during its service life,it is important to analyze and calculate the fatigue of the foundation.This article combines practical project engineering,the fatigue reliability of jacket platform under wave-current coupling is analyzed and studied emphatically.Firstly,the whole model of jacket platform was established by using finite element software.Wave phase angle was calculated by programming method,corresponding wave load calculation was carried out,and the static analysis of structure was carried out.Secondly,the dynamic analysis of the whole structure is carried out,and the stress concentration coefficient of the key hot spots is solved by the finite element method.Then,the local finite element model is established to obtain the hot spot stress,and the fatigue life of the pipe joint is calculated by using the transient dynamic analysis and the S-N curve.