Research On Multi-target Automatic Optimization Of Ship Type Based On SolidWorks Secondary Development

The resistance of the ship and the seakeeping of the ship are respectively one of the important performances of the ship when driving in still water and waves.At the same time,it also reflects the speed and movement of the ship to a certain extent.Research on the performance of ships in still water,especially the speed of ships in still water,has always been the focus of ship designers.It is directly related to the operating efficiency of the ship,and how to efficiently and intelligently optimize the design of the minimum resistance ship type It is the focus of the shipping industry.In recent years,the linear superposition principle and slicing theory have been widely used in the field of ship design.With the gradual development and continuous improvement of the two theories,the navigation performance of ships in waves has gradually entered the eyes of the public,and people have paid more and more attention.Nowadays,the seakeeping of ships has become a hot spot in the field of ship research,and whether it is good or not has become one of the key indicators to measure the navigation performance of a ship,and whether it is good or bad directly affects the habitability and use of a ship.Sex and safety.For this reason,the seakeeping and resistance properties of ships are two major issues that have plagued ship designers for a long time.Given the above two points,this paper established a Solidworks-based multi-objective automatic optimization integrated system for shipshape,and based on parametric modeling,explored the combination of the Holtrop formula and Moirémethod with modern engineering optimization algorithm-genetic algorithm to shape the ship Optimize the design.The main research contents of this article include:(1)Analyzed Solid Works software and API object properties,methods,and events,and explored the secondary development ideas and the use of VBA and macro recording to develop Solid Works.(2)Through the Solid Works software,a 50,000 DWT product oil tanker was parametrically modeled,and the parametric modeling technology was used to quickly generate the three-dimensional NURBS surface of the hull through the model value points.Moreover,only need to change the value of the shape value point we need,the shipshape line can be changed quickly,and then the shipshape of different shapes can be obtained in a short time.In this way,the model value point of the ship is closely combined with the resistance performance of the ship and the seakeeping of the ship.(3)Based on the Holtrop formula and Moor method,the ship resistance forecast program and the ship wave resistance increase,ship pitch,heave motion amplitude forecast program was compiled.The forecast results in this paper are compared with the experimental conditions and data of previous researchers to verify the feasibility of the numerical simulation strategy.(4)The three goals of the ship’s total resistance and wave resistance increase,and ship heave and pitch are used as optimization targets to optimize the hull profile.The application of the genetic algorithm in ship type optimization is preliminarily studied,the relevant optimization program is compiled,the corresponding design variables are selected and the constraint conditions are set,and the profile of the 50000 DWT product oil tanker is optimized.By comparing the cross-sectional diagrams of the optimal ship type with the original target ship type,analyzing the differences,and combining the resistance reduction numerical analysis of the resistance reduction effect,complete the demonstration of the reliability and rationality of the ship type optimization method used in this paper.In summary,the parametric ship form based on the secondary development of Solid Works and the researched ship form line optimization method proposed in this paper can improve the quality of ship design,improve design efficiency,and reduce the workload of ship researchers in the ship design stage.At the same time,the total resistance and seakeeping of the ship are improved,which has certain reference and practical significance in practical engineering applications.