Conceptual Design And MDO Of Multi-Navigation State High Speed Platform

Based on the need of modern antisubmarine and special operation,this work proposed the concept of "multiple-navigation state high speed platform" that combined conventional designing approaches of surface ship and submarine with multidisciplinary design optimization(MDO)method.The designing and optimizational strategy of multidiscipline and multiobject were carried out to develop the platform of this concept.The major research contents are shown as follow:In terms of practical demand,this work developed the initial design of"multiple-navigation state high speed platform" and established the overall designing scheme.According to the designing principle of surface ship and submarine,demand of high operation performance and standard of multiple-navigation state,this work carried out the design of pressure hull and non-pressure hull,power propulsion system and general layout and accomplished the analysis of hydrostatic performance and stability of multiple-navigation state.The stability chart of submergence and floatation was obtained according to the stability investigation during submergence and floatation,and the rationality of initial projected was verified by criterion for checking.The multidisciplinary designing optimizational procedure of the multiple-navigation state high speed platform was confirmed.The subject design variate and range of data were selected,the optimization objective and constraint of system were identified and the system designing framework was constructed.The critical technologies of MDO approach,including design of experiment,method of approximation,sensitivity analysis,search strategy and optimization of algorithm,were performed.It was illustrated that the desiging experiment of Opt LHD exhibited excellent performance in optimization efficiency and uniformity,and the OSA method was more suitable for sensitivity analysis of platform designing variates.In addition,it was more appropriated to adopt NSGA-II method as multidisciplinary searching strategy of platform and apply MDF method to construct optimizational framework.it was shown that RSM-2 model was better for rapidity subject of overwater and seakeeping subject which were obtained from comparison of precision validation of approximate model.What's more,RSM-3 model was proved to be more suitable with respect to the stealth and underwater rapidity.The design and analysis of rapidity,seakeeping and stealth were carried out,and the hydrodynamic numerical simulation as well as radar scattering intensity calculation of the platform under different calculation conditions were accomplished.The rationality of the calculation method was verified by comparing and analyzing with empirical law.Based on the selection principle of calculation condition,select navigation resistance,response amplitude operator(RAO)and radar cross section(RCS)under design condition were used as disciplinary state variates.The output power of underwater that possessed low allowance were chosen as the system constraint ensuring the rationality of platform optimization result.The approximate models of subsystems,such as rapidity,seakeeping and stealth were successfully constructed and the accuracy of these models and the sensitivity of designing variates were proved to perform well.The results of single-objective optimization of platform's various disciplines were obtained and compared with each other,it was exhibited that the searching strategy efficiency of MIGA method was higher than others,and ASA performed a better convergence effect of searching strategy.The multi-disciplinary optimization framework of the platform was built through MDF method and the Pareto optimal set was obtained from calculation.The final optimized plan of multiple-navigation state high speed platform was obtained according to the tendency of optimization objective and minimum distance method and surpassed the test of stability horizontal calibration.Compared with the initial procedure,the performance of platform exhibited a great improvement on the premise of meeting the designing demand.