Research On Resistance And Seakeeping Of Hydrofoil Composite Hull Of Catamaran Wind Power Operation And Maintenance Ship

China’s existing offshore wind farms are mainly focused on offshore projects,but multiple provinces plan to incorporate the construction of far-reaching offshore wind power into the development plan of the 14 th Five Year Plan.As a result,there is a high demand for high-speed operation and maintenance ships in offshore wind farms.At the same time,the comfort requirements of operation and maintenance personnel are becoming increasingly high,posing significant challenges to the navigation performance of operation and maintenance ships.The double hull hydrofoil composite ship type can improve the speed and seakeeping performance of ships.Based on the design requirements of a conventional twin hull ship,the hydrofoil airfoil and related parameters are analyzed according to the design requirements of a twin hull hydrofoil composite ship,and the profile shape of the hydrofoil is determined.Python software programming is used to optimize the hydrofoil scheme that meets the requirements of lift and stiffness,including the combination of span length,chord length,and angle of attack parameters.Based on the structural characteristics of the twin hull mother ship,determine the longitudinal and vertical installation positions of the front and rear hydrofoils,design 8 composite ship type schemes,and use the software Solid Works to create a three-dimensional model of the twin hull hydrofoil composite ship.Use numerical simulation software STAR-CCM+to solve the static water resistance and lift of a single hydrofoil of a twin hull ship,and verify the numerical simulation results to determine the resistance numerical simulation method.Numerical simulations were conducted on the static water conditions of twin hull mother ships and twin hydrofoil composite ships,to study the effects of ship type schemes and front hydrofoil rear wings on the ship’s stern angle and static water resistance,and to analyze their possible causes.Numerical simulation of the seakeeping performance of a catamaran hydrofoil composite ship in first-order regular waves,and study the effects of ship type schemes and front hydrofoil and rear wings on the longitudinal and heave motion responses and wave resistance of the ship.Based on the above numerical simulation results,8 composite ship type schemes were optimized.The comprehensive evaluation system selected the composite weight method,the subjective aspect selected the order relationship method,and the objective aspect selected the entropy weight method.A weighted comprehensive evaluation matrix was constructed to select the composite ship type scheme with better comprehensive performance.In this thesis,hydrofoil technology and catamaran are combined to form a catamaran hydrofoil composite ship,which shows greater advantages in resistance and seakeeping,laying a foundation for the operation and maintenance of the far-reaching offshore wind farm,and also providing a useful reference for the research of such ship types.