Research On Multidisciplinary Design Optimization Of Navigation And Structural Performance

Several hotspot problems are researched systematically according to multidisciplinary design optimization of navigation and structural performance in ship area. The research contents include: the basic technology of multidisciplinary design optimization of navigation and structural performance -- interface technology of CAD/CAE, parametric modeling technology, and automatic mesh generation technology; buckling strength check research on performance design optimization of ship structure; hydrodynamic performance calculation of submarine and flow field simulation and linear optimization in navigation; propeller optimization design based on numerical calculation method in navigation.Firstly, ship navigation, structural numerical calculation method and optimization theory are presented. Secondly, in order to meet the need of finite element calculation and optimization design, interfaces among CFD, structure and SHIDS database are built, extracting ship form and propeller data from SHIDS database is realized, geometric models are created according to interpolation method, surface combination and solid model dissection. A parametrically automatic mesh generation program is developed for ship, submarine and propeller. The mesh gap classification and repair method based on adjacency matrix is presented according to a few mesh gaps generate when importing and exporting the model. A method that calculation results of sparse mesh model become analysis LBC of refine mesh model is presented according to precise requirement of sparse and refined mesh in the stress concentration region, and refining mesh algorithm based on transition element is realized. The results show not only models are created quickly, but also the mesh layout is more reasonable and result is more precise. The results also show these methods are suitable for both whole ship analysis and part region analysis. And then hull common structural ruler is researched, the automatic identify algorithm of strong frame is presented and evaluation system of ship panel buckling strength is realized, problem that large-scale buckling strength check is difficult to carry out only by hand is solved, improves the efficiency of ship design, these methods are brought into China Classification Society advanced buckling evaluation calculation system. At last, submarine which meets the requirement of general arrangement but has not been determined optimal resistance, an optimization numerical computation algorithm with automatic program is provided. For propeller design optimization, Latin method of design of experimental is used to explore and reduce design space, method of weight factor is used to optimize again with the optimization result above, then robustness design and optimization is taken with DFSS and Kriging models. The results show that resistance and flow field of submarine can be predicted, as well as submarine hull can be optimized with numerical computation based on automatic program. The optimization design of propeller can shorten the design time and lay a foundation for the research of new type with the shape of blade tip.