The structure optimization of unmanned underwater vehicle's wedge-ring joint based on the response surface method

This paper focuses on structure optimization of wedge-ring joint of underwater robot based on response surface method (RSM). Experiments for the combination of the 4 parameters of Unmanned Underwater Vehicle's (UUV) wedge-ring joint are designed in combination with central composite experimental method (CCD). FEA software ANSYS is used to get the respond data of structure stress and mass of wedge-ring joint, and Design-Expert is used to fitting the samples' data to quadratic response surface. The constraint condition of optimization is that the stress of the structure can fulfill the requirement, and the optimization object is to minimize the mass of the wedge-ring joint. Comparison is made between the optimization results of different optimization algorithm, which shows that although the maximum equivalent stress of the structure increases by 13.10%, it can still meet the structure's stress requirements. Meanwhile, the mass of UUV's wedge-ring joint is reduced by 14.96%.