由于船舶在风浪中运动的强非线性和非定常RANS法的复杂性，使得实船线型优化和航行控制优化研究具有挑战性。本项目重点研究基于自由变形法的船体几何重构技术，基于动态结构重叠网格技术的船舶六自由度运动求解方法，混合遗传算法和新型伪定常变形法的船型优化策略，实船航行优化控制方法，构建基于非定常RANS法的船型SBD设计和实船航行优化设计框架。综合考虑船舶的快速性、耐波性和操纵性，以DTMB5415军舰、KCS集装箱船、KVLCC1油船为研究对象，以非定常RANS法计算多载况、多航速下的波浪阻力为目标函数，以反映船体形状变化的参数为设计变量，以排水量限制为基本约束条件，结合混合遗传算法进行优化计算，获得理论上的优化船型，再以此船型为母型，研究以最小纵倾值为设计变量的航行控制优化，以此来评估该船型在实际航行中的阻力性能，最后通过船模试验验证航行性能最优船型。其研究成果可为“绿色船舶”设计提供技术支持。

Due to the complexity of the unsteady RANS method and the strongly nonlinear of ship motions in waves, the hull form lines optimization and navigation performance optimization have become a big challenge to deal with. This project focuses on the issues of the hull geometric reconstruction technique based on the Free-Form Deformation (FFD) approach, the solve equations of ship motion responses based on the dynamic structured overset mesh, the hybrid genetic algorithm, the hull form design based on the new pseudo-steady deformation method, navigation performance optimization for full-scale model. For the purpose of illustration, the simulation based design (SBD) optimization frameworks and the navigation performance optimization frameworks have been built using the unsteady RANS method. Firstly, considering the rapidity, seakeeping and maneuverability of a ship, the optimization frameworks have been applied to the optimization of the DTMB5415, the KCS container ship, and the KVLCC1 tanker, respectively. The unsteady RANS method is used to calculate the wave resistance (objective function) at different loading conditions and Fr. The parameters which can change the shape of a ship are taken as the design variables. Under the constraints of the displacement, propulsive and maneuverability, the hull forms have been optimized integrating the optimizer and approximation technique. After the completion of the optimization, the best hull forms have been obtained. Next, in order to obtain minimum total resistance in the real navigation, the hull forms of the three ships have been optimized for total resistance using the trim values as the design variables. Then, the optimal ship type has been tested by experiment. The results show that the present optimization frameworks can be used to optimize the ships for reducing the wave resistance and improving the performance of the ships for seakeeping and maneuverability, and also can provide technical support for the design of green ship.