Research On Optimization Design Method Of Composite Mast

With the continuous deepening of human development of the ocean,our requirements for ship structures are also increasing,just like traditional masts are subject to material characteristics,and the performance of traditional masts has gradually failed to keep up with the development of ship technology.Compared with traditional shipbuilding materials,composite materials have the characteristics of high specific strength,high specific modulus,easy design,corrosion resistance,fatigue resistance,wear resistance and so on.In this thesis,an optimal design scheme of composite mast is proposed based on the mast type and composite material laying mode,which improves the mechanical properties of the structure and reduces the structure weight.Then,the response of guyed mast structure under high wind speed is studied by fluid structure coupling analysis,and the results are compared with the results of code calculation in traditional method,and the necessity of fluid structure coupling analysis for composite mast structure design is discussed.The main contents of this thesis are as follows:(1)By comparing the frequency response curve measured by modal test with the natural frequency obtained by simulation analysis,the material parameters and boundary conditions of the composite mast in the optimal design are determined.On this basis,the original design of the composite mast is restored by using the finite element software,which provides a reference for the subsequent structural optimization design of the composite mast.(2)The effects of ply thickness,ply angle and ply sequence on the strength and stiffness of composite cylinder structure are investigated.Some applicable design methods and problems needing attention are summarized.On this basis,the mast type and ply of composite mast are redesigned.The performance of composite mast in strength,stiffness and quality is improved compared with the original design.(3)A two-dimensional fluid-structure coupling analysis was carried out on the equivalent body of the composite mast,and the pressure load distribution of the mast was set according to the results of the fluid-structure coupling analysis and the results calculated by the specification.The pressure load distribution of the mast was obtained by studying the two methods The stress and deformation of the structure not only check the strength of the composite mast structure but also compare the differences between the two methods.