Stiffened Structure Of Ship Of Dynamic Optimization Based On Improved Genetic Algorithms With Cataysmic Mutation

With the continuous deepening of the concept of "lightweight" of modern ships and the rapid increase in construction costs,the demand for optimized design of ship and marine engineering structures has gradually increased.The stiffened plate is the most basic structural form of the ship.It is flexible in the design space and has excellent bearing performance.It is closely related to the structural strength,vibration,noise and stability of the ship,and it has a significant impact on the overall optimization of the ship.Performance impact and economic benefits.Therefore,it is of great value to optimize the stiffened structure.In this paper,based on the genetic algorithm of large mutation,to meet the application specifications,cost requirements and performance indicators of the actual engineering structure,and performs dynamic optimization of the reinforced structure.First,the basic genetic algorithm is studied and discussed,and the operation of the improved cataclysmic mutation operator is implemented on the basis of its basic theory.The feasibility of the large mutation genetic algorithm is verified by testing and comparing the two classical functions.And search capabilities.Then,the basic theory of structural finite element analysis and optimization design is discussed,and the programming language and structural optimization module of ANSYS are briefly summarized.The optimized algorithm is written to call the main program for data transfer,so as to realize the automation of the optimized program.Taking the optimization of the ten-bar plane truss as an example,it is verified that the joint optimization mode is more effective than the self-contained optimization module.Next,using this optimization model,for the design characteristics of statically determinate multi-span girder and longitudinal skeleton ship bottom frame,the geometric parameters of the structure,the type and position of the aggregate are the design variables,and the displacement,stress and frequency constraints are the constraints.The lightest quality or structural fundamental frequency is optimized for the objective function.Finally,the vibration isolation performance of the frame-stiffened floating raft is discussed through harmonic response analysis and power flow calculation,and the influence of important parameters of the floating raft system on the vibration reduction performance is discussed;using txt text as the data interface,ANSYS is implemented through MATLAB The background call and data transfer of the batch processing mode,the improved genetic algorithms with cataclysmic mutation optimization program and the finite element analysis software are used in collaboration,and the quality of the frame-stiffened floating raft is optimized with the vibration isolation performance and the basic frequency as constraints.The results of the study show that the joint optimization model proposed in this paper has good applicability,has a significant design effect on stiffened structures,and has certain application value.