Structural Reliability Analysis And Optimization Of Offshore Wind Turbine Connector Based On Multiple Response Surface Method

With the large-scale development of offshore wind turbine,the connection structure between the wind turbine tower and the infrastructure needs to be innovated.As an important part of large-scale offshore wind turbine in the future,the new offshore wind turbine connector can realize the rapid installation of offshore wind turbines and ensure the smooth operation of offshore wind turbine.In this thesis,a new type of connector suitable for the current mainstream 5KW offshore wind turbine in designed based on the study of the different structural forms of large-scale structural connecting devices at home and abroad.Through the analysis of the failure mode of the offshore wind turbine connector,combined with the structural reliability theory,a structural reliability analysis method of the offshore wind turbine connector based on the multiple response surface method is proposed,and the structural optimization method of the offshore wind turbine connector is researched.First,the finite element model of the offshore wind turbine connector is established by ANSYS.And the maximum stress and the contact penetration between the upper and lower hubs of the offshore wind turbine connector under each working condition are calculated to meet the design requirements based on the static strength analysis and failure judgment criteria.Secondly,the sensitivity analysis is carried out on the structural size of the offshore wind turbine connector,and the multi-response surface model of the offshore wind turbine connector is obtained by the Latin hypercube sampling test method combined with the least square method.Then the reliability probability of the connector of the offshore wind turbine under two dangerous working conditions is 99.73% and98.8% based on the kernel density estimation method and the stress intensity interference theory.Finally,the nonlinear quadratic programming algorithm(NLPQL)and the multi-island genetic algorithm(MIGA)are used to optimize the structure of the offshore wind turbine connector with single objective and multi-objective respectively,and the optimal structural scheme of the offshore wind turbine connector is obtained by comparative analysis.Thus,the structural reliability analysis method of offshore wind turbine connectors based on the multiple response surface method proposed in this thesis can provide a theoretical basis and technical support for the future optimal design of offshore wind turbine connector.