The Comprehensive Optimization Of Hydrodynamic Performance And Structural Characteristics For A High-speed Ship

Ship is a system which constituted many units, has the characteristics of a special operating environment, great number of types, complex systems, high technology content, invests greatly and long life cycle. All these characteristics lead the ship design to multi-parameter, multi-objective and multi-constraint optimization problems. Therefore, the integrated optimization of ship performance is an important element in ship design.This paper selected 45 variables from the ship parameters, and built the comprehensive optimization constraints. Considering the various performance objective functions, the paper established a comprehensive optimization mathematical model of high-speed ship navigation performance, which contains the rapidity, maneuverability and seakeeping performance optimization, and structural characteristics, which mainly considered the optimization of transverse section.Considering the advantages and disadvantages of genetic algorithm and chaos algorithm, this paper constructed an improved parallel genetic chaos algorithm based sensitive variables. Then it was combined with comprehensive optimization mathematical model and the paper used VC++ language to develop an integrated optimization program of high-speed ship navigation and structural performance. A large number of calculations show that the operation of the optimization process is accurate, efficient and reliable.In this paper, the secondary development language of the finite element software MSC.Patran——PCL(Patran Command Language) was used to programme the system of parametric modeling, loading and calculating. And the procedure of the calculation was achieved basically.Finally, based on Visual Basic platform, conducted a preliminary integration, which combined integrated optimization process of navigation performance and structural properties with the finite element parametric modeling program. The author designed a good interactive user interface and initially established platform for integrated optimization and parameter modeling calibration. After that, the author uses the system to some optimization and analysis for different weights of objective functions. All these had laid a good foundation for the comprehensive optimization of high-speed ship.