The Modal And Parameter Analysis Of Jacket Support Structure For Marine Engineering

Research of hydraulic structure has not been already limited to en gineering structures which are in the inland bodies of water,as the offshore wind turbine,the development of offshore oil and the rapid development of many other marine engineering,the engineering of hydraulic structure is going to develop towards broader extension of marine engineering.Today,the development of offshore wind turbine is faster and faster,the scale is increasing bigger than bigger,but the costs of the support part of the offshore wind turbine are set of total costs 20% ~ 30%,and due to water of sea,the action of seabed soil,it is very important that to research the support structure.This paper mainly studies the jacket support structure and the pile foundation which is directly contact with the seabed soil.This paper firstly introduces the background and significance,then introduces the overall structure of the OWT,expounds the types as well as the comparing the advantages and disadvantages.This paper expounds the analysis of the research status at home and abroad to determine the research direction of this paper.Introduces theory and the calculation formula of the environmental loads applying to the offshore wind turbine support.Then considering the structure of the deep water of 50 m and the nonlinear interaction between the pile and soil,expound the P-Y curve method in detail,and introduces the application results how to be used in ANSYS.Then based on the international standard,design the size and the structure arrangement for the jacket,and using ANSYS finite element software and program,to establish the structure of the jacket model.Make static analysis,modal analysis and stability analysis checking the reliability of analysis results.Finally,change the size of the jacket,study the corresponding change of the modal analysis results,depict the trend line,the results can be used for optimize the size of structure.And then research the rate of change of the modal analysis results under the condition of the size of every parts change the same,to determine the parameters sensitivity of all the parts of the jacket.Results show that the diameter of pile has the most significant influence,the mud surface is on the contrary.This paper study the jacket of 5MW offshore wind turbine working in the water depth of 50 m,study the nonlinear relationship between pile and soil,facing of the future trends that our country will develop the high power offshore wind and working in the deeper water,this paper have certain reference significance.