Bearing Capacity And Dynamic Response Of Wind Turbine Support Structure Integrated Wave Energy Converter

At present,it is an important subject to promote the establishment and research of the integrated offshore multi-energy power generation device in the field of new energy research.This device which provides a common support structure and power transmission system for wind turbine and wave power generators,can effectively improve energy and space utilization rate,increase generation stability and reduce the per-unit cost of power generation.Model test and numerical simulation were used to research the bearing capacity and dynamic response of the wind turbine support structure integrated wave energy converter under different environmental conditions and load combinations.The main research contents and achievements are as follows:(1)Scale model tests were designed to research the bearing capacity and dynamic response of the mode wind turbine support structure.And the influence of different environmental conditions and load combinations on the bearing capacity and dynamic response of mode wind turbine support structure were studied.It is concluded that under static loading,the horizontal bearing capacity of the model wind turbine support structure with water conditions decreases by about 30% compared with that without water conditions.But under cyclic loading,the horizontal bearing capacity decreases by 40% ～ 50% compared with that without water conditions.The cumulative deformation of pile top caused by unidirectional flow load and cyclic load act together is much larger than the addition of their results.When unidirectional flow load and cyclic load act together,the cumulative deformation growth rate of pile top increases firstly and then decreases with the increase of flow intensity.(2)The bearing capacity of wind turbine support structure integrated wave energy converter was studied.Based on finite element software,a three-dimensional numerical model was established to research the influence of integrated wave energy converter and the change of Young’s modulus,cohesion,and friction angle on the bearing capacity of wind turbine support structure.It is concluded that its impact has been minor on the bearing capacity of wind turbine support structure to integrate wave energy converter,and the stress of the support structure mainly concentrates on the mud surface to one-time pile diameter below the mud surface,and the displacement peak is located at the top of the wind turbine tower.The Young’s modulus and cohesion of soil have great influence on the bearing capacity of wind turbine support structure integrated wave energy converter,and the influence is obviously different with the change of flow intensity.(3)The dynamic response of wind turbine support structure integrated wave energy converter was studied.Researching the dynamic response at pile bottom,pile mud surface,pile top and tower top of wind turbine support structure integrated wave energy converter under different environmental conditions and load combinations.It is concluded that the changes of displacement,velocity,and acceleration at pile bottom are opposite to others.With the increase of cycle times,the displacement peak of wind turbine support structure integrated wave energy converter increases gradually,while the peak of velocity and acceleration decreases gradually.It can be seen that after the integration of the wave energy converter,the horizontal deformation of the structure under dynamic load increases by about 10%,which reduces the safety of the whole structure.The conclusions obtained in this paper can provide a numerical basis for the bearing capacity and dynamic response of the wind turbine integrated wave energy converter,and provide a reference for the design of integrated offshore multi-energy power generation devices.