The Optimization For Cantilever Structure Of Naval Vessel Based On Big Mutation Genetic Algorithm

Generally, the navigation environment of the ship is very bad. The ship suffers the host, propeller and wave exciting force. Due to run under complex excitation, the structure of the ship performance requirements are relatively high, not only need to meet the design requirements of strength and displacement, but also the structure need to avoid the harmful vibration which lead to shorten the life and operational performance of war ships, and etc. Cantilever structure is used commonly to make the masts of ships, columns, and etc., these components are important and complicated. During the design process, we should full consider the mechanical properties such as strength, displacement, natural frequency, and e.t. Researching the optimization design problem of cantilever structure in naval ship, to improve the efficiency of ships combating, has very practical significance, at the same time, it also has the certain model function to solve other problems in the ships.In this paper, the classic beam element with shear of the finite element is derived based on the Timoshenko beam theory, laying the foundations for the finite element program and structure analysis, and emphatically discusses stress smooth problem. This paper chooses big mutation genetic algorithm as the optimization algorithm to solve the problem of this optimization. Big mutation genetic algorithm has fast convergence rate, good commonality ability. This paper’s author combined structure optimization algorithm and finite element theory to write FORTRAN calculation program, all the optimization numerical calculation of this article is done by the FORTRAN program written by the author.This paper has discussed the additional quality of cantilever structure under the action of the static intensity and frequency of combinatorial optimization. Considering the ship structural design characteristics, to establish the optimization model can more suitable for engineering practice, this paper has used the continuous design variables, discrete design variables and the mixed design variables. At the same time, this paper also studied the mechanical features of cantilever beam, which is at the basic movement; on the basis of the above all, the author has processing the cantilever beam size optimization.Finally, the author of this article, summarizes the research content, points out the insufficiencies of this study, and puts forward some effective improving methods.