Multidisciplinary Design Optimization Method Of Maneuverability, Rapidity And Energy System For Flat UUV

UUV’s design system contains a number of disciplines, the design process is more complicated. Traditional design method is designed in accordance with conceptual design,preliminary design, detailed design and so on, the design process requires repeated adjustments and modifications. So, there are some disadvantages of traditional way, such as low efficiency and high cost. And Because of the coupling relationship between the different disciplines have not been taken into account, the UUV’s overall performance is not necessarily the best. In this paper, the multidisciplinary design optimization method is applied to the UUV design. The design goal is a large flat UUV. The design system is decomposed into rapidity system, maneuverability system and energy system. This paper carried out applied research on flat UUV’s multidisciplinary design optimization based on comprehensive consideration of the coupling effects between the various disciplines.Research work is summarized below:1.Preliminary designed the main hull of the flat UUV. By the analysis of resistance calculation based on CFD, we found that the resistance performance of the initial flat UUV is not the best, and need to be further optimized.2.Optimize the resistance system and design: Based on the response surface method,using a full factorial experimental design, the author established 81 geometric hull models,405 test points totally, carried the CFD simulation by using Fluent 14.5 software, and obtained the total resistance of the hulls respectively. The author got response surface equation by using the dimensionless analysis. The accuracy of the equation was proved.The total resistance of the hull was got by calculating the speed and the hull surface area.The propulsion system optimization design was carried out. Finally, the mathematical model of submersible rapid systems was established by considering the resistance and propulsion performance.3.Select the 8 performance indicators of vertical and horizontal movement as maneuverability, and carry out the extreme edge of the assumptions and spreadsheets to determine the appropriate membership function. The weight of performance indicators was got by using the expert consultation of fuzzy judgment. The mathematical model of submersible maneuverability system was build.4.Electric energy systems, including equipment and power: The battery voltage isrequired to meet the needs of dive tank systems, but the battery was also constrained by the energy demand and cabin geometric. So the author select circuit efficiency electrical equipment, power electricity, energy reserves coefficients and energy tanks as indexes for the energy system optimization. At last, a comprehensive optimization system was established.5.The thesis introduces the basic concepts of optimal design, and also detailed the optimization methods, which was commonly used, such as genetic algorithms, chaotic algorithms, parallel method and hierarchical methods.6.A comprehensive optimization mathematical model of three performance of large flat unmanned submersible was established, submersible, and comprehensive performance optimization software was developed. The sensitivity of the design variables was carried out by using the optimization software of flat unmanned submersible. The author also analyzes the effect by using different objective functions, different optimization methods,and different target weight. Finally, an comprehensive optimization program of large flat unmanned submersible was established and the final optimization results.