Abstract. In this paper, a planing boat has been selected as the research object, which has been used as a model to make a new model by scaling. And the free decay experiments have been conducted under different states including different rolling angle, different pitching angle and different ship's draft, whose corresponding mathematical models have been established according to the characteristics of the planing boat. A identification system using optimization concept has been used to identify the experimental data, which finally obtained the variation law of hydrodynamic derivatives. And the hydrodynamic coefficients related have been obtained by the later analyzing the data. The results and the methods of studying the planing boat can provide basis for the improvement in the navigating performance of the planing boat.

Estimating the sailing resistance of unmanned submersible vehicle when navigating in the water is an important part for designing the hull profile. As there is no wave resistance when the unmanned submersible vehicle navigating in the water, so the main hull resistance mainly includes friction resistance and viscous pressure resistance. There are a lot factors affecting the resistance of the hull, including the length of bow,the length of stern, the length of middle body, the molded breadth, the molded depth, the design speed and the aspect ratio of rudder. The above factors have been selected as design variables of the resistance optimization system and the regression relationship between design variables and the frictional resistance viscous pressure resistance has been established by the response surface method, which can obtain the approximate function formula between the objective function, constraints and the design variables, providing a basis for the establishing of resistance optimization system. The design can be expanded to an overall situation by this method, then this complex disciplinary analysis can be separated from the optimization process, which can reduce the amount of calculation and optimization time. The application of polynomial response surface method in resistance optimization system has been studied in this paper and the accuracy of five polynomial response surface functions also have been studied, which reflected that the accuracy of second-order response surface is better than that of the first-order and third-order response surface. The response surface of wet area of the hull have a high fitting accuracy.

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Abstract-Taking the comprehensive performance of a new type of high-speed unmanned surface vehicle (USV) including its rapidity, maneuverability, seakeeping and overturning resistance into consideration, this paper establishes a mathematical model of the performance comprehensive optimization of high-speed USV. And according to the mathematical model and optimization algorithm, comprehensive optimization software based on a variety of optimization algorithms was designed and compiled to analyze the relevant calculation. The results indicates that the optimization effect of the growth mechanism is more superior to the roulette mechanism; genetic algorithm of growth mechanism and particle swarm optimization algorithm would have the best results in the optimization of the 5000th generation, and it can get the rapidity optimization system had greater influence on the total optimization system; and what's more, the optimal values of hull length and other key design variables and partial parameters of different algorithms are obtained.