Analysis Method Of Wave Load And Motion Response Of Module-based Cage

Now the aquaculture industry is currently developing rapidly,but offshore land-based pollution and intensive aquaculture have caused frequent occurrence of diseases in offshore mariculture.Making full use of the vast open sea has become an inevitable trend for the development of aquaculture.However,the ocean environment in the far-reaching open sea is harsh,and there are destructive natural disasters such as bad winds and waves,which will cause large deformation of the cages,resulting in the failure of the cage structure.Therefore,there is an urgent need to study a numerical prediction method suitable for prediction of module-based cage movement and wave load,and to provide guidance for the development and design of new cages.Based on the Morison formula and multi-body kinematics theory,this paper proposes a numerical simulation method that can efficiently and accurately predict the motion and load response of the module-based cage in waves and currents.Taking the new deep-sea truss-structure Module-based Offshore Fish Farm(MOFF)as the research object,and researching its wave load and motion response characteristics,the main research contents of the thesis are as follows:(1)The mesh model is simplified by the mesh grouping method,and the Morison formula is used to calculate the wave load acting on the grid and the net.Based on the displacement continuity condition of the hinge point and the catenary equation,the hinge force and mooring force of the cage are solved.Establish and solve the kinematic coupling equations of the module-based cages to obtain the wave load and motion response.Based on the above theory,a calculation program for the wave load and motion response of module-based cages in waves and currents is completed.(2)Based on the experimental data processing results of single-module and double-module cages,the numerical prediction method of the wave load and motion response of the module-based cages in waves and currents is verified.And the load and motion response characteristics of the module-based cages are studied and analyzed.(3)Based on the above-mentioned numerical prediction program,the hydrodynamic response characteristics of the cage under different combination modes are analyzed.The influence of hinged structure,wave direction and Shielding effect on the motion response of module-based cages and the load on the connecting structure are analyzed.The pros and cons of the motion performance and load performance of the straight line and "V"-shaped arrangement of cages under different working conditions are discussed,which provides a theoretical basis for the further research and development of the Module-based Offshore Fish Farm.