Bionics Design And Performance Analysis Of Offshore Wind Turbines Foundation Based On Taproots And Stalks Architecture

Over a long period of evolution in nature,the structure of plants has an excellent performance.The macro or micro structure also provides a new idea for the modern design.According to the analysis of the plants' roots,which found that the space configuration of the plant' root effects its lodging resistance,anchorage and support ability by analyzing the root of plants.And the cross section of the stem shape influences its structure feature such as specific stiffness,specific strength.Based on the basic concept of structure bionic,this paper refers to the roots' layout relationship of the tall trees and applies the excellent lodging resistance,support load and anchorage ability to the design of offshore wind turbines.Besides,the paper makes bionic design to lotus rack stalk which has high specific stiffness and specific strength.This paper though structure similarity to realize function similarity and aim to make the bionic design which is based on root skeleton for pipe rack layout and based on the stalk cross section makes catheter stiffener bionic design.At last a reasonable structure is chose,which has a very good load resistance capacity such as wind,wave and flow.First of all,analyzing the mechanism and characteristics of plants' roots and stems were prepared for the bionic modeling.According to the analysis of lodging resistance of plants,it is found that the length of stems and roots,the cross section of the stem shape,the diameter and number of roots,the angle between roots and the horizontal,and the angle between the roots affect plants lodging resistance and anchorage.This paper built a concept model considering these factors,which provided a basis for bionic design of offshore wind power.Based on the analysis of the stem cross section cavity structure,this paper evolutions the cross and analyzes structure choose the best bionic catheter stiffener,which has excellent specific stiffness and specific strength by the finite element.According to the typical three legs structure,this paper has got five bionic configuration models with bionic roots layout and bionic stem stiffener.Secondly,it makes coupling analysis with five different structure forms which are based on multiple working conditions of wind,wave and flow field by the finite element theory and numerical analysis method.And then uses comparative method to select the four legs structure is the optimal bionic structure after the analysis.Fatigue analysis is carried out on the optimal structure under the random environment loads to confirm the security of this model.And accordance with local conditions,the most reasonable structure's earthquake acceleration on time-history was input to explore the seismic resistance of structures.Finally,this paper gives multi-objective size optimization based on minimum quality,stress and deformation under the coupling field conditions,and combining with the bionic concept modeling impact factors makes sure the optimized parameters.This optimization can be regard as bionic roots evolution under the outside loads coupling adapt to the environment.Rearranging the layout between the pipe racks by the optimization has the best load path and more reasonable structure.Compared with the former models,the bionic structure based on the plant roots and stalk has a safe and reliable,light quality,more excellent load path,simplenss and so on.The analysis results provided a certain reference value for design and development of offshore wind power.