Research On Experimental Design And Sensitivity Analysis Methods Of Electromagnetic Railgun Exterior Trajectory

As a new type of kinetic energy weapons electromagnetic railgun has the high hit precision,good concealment and strong damage effect,etc.But by the limits of the objective conditions,such as manufacturing cost,test cost and emission technology,the current research is still in the theoretical and Experimental stage,while the method of the simulation for researching electromagnetic railgun can shorten the development cycle,reduce the test cost,and improve the overall performance.Experimental design and sensitivity analysis is one of the important research means,how to obtain efficient and reasonable design of simulation test and proceed accurate sensitivity analysis,excavation the influence of various factors on the performance of the system in deep level has a great significance for evaluation and optimization of the electromagnetic railgun system.This article around the question above carries out the following research.Firstly,aiming at the characteristics and analysis requirements of electromagnetic railgun,the experimental design and sensitivity analysis frame of electromagnetic railgun is designed.A six degree of freedom model of exterior trajectory projectile is established and the corresponding exterior trajectory simulation is carried out.And the methods in the experimental design and sensitivity analysis of electromagnetic railgun are analyzed,which lay the foundation for the following chapters.Secondly,The optimal Latin hypercube experiment of electromagnetic railgun is studied in order to solve the problem of more computation and less efficiency.An Optimal Latin Hypercube Experiment Design method based on Multi-mutation adaptive genetic algorithm is proposed to solve the high computational cost and easy to get into local optimal solution.An example is given to show that the method is superior to the three existing methods in accuracy and efficiency and the rationality and validity of the method are verified.Thirdly,sensitivity methods for exterior trajectory of electromagnetic railgun are studied.According to the characteristics and the analysis purpose of electromagnetic railgun trajectory,the sensitivity analysis process is established.To improve the sensitivity analysis of mixed uncertainties,an improved Sobol sensitivity analysis method based on auxiliary variable method is proposed.The sensitivity analysis of firing accuracy of electromagnetic railgun is analyzed in an example,and the sensitivity of different factors to firing accuracy of electromagnetic railgun is analyzed,which verifys the correctness and practicability of the proposed method.Finally,an experimental design and sensitivity analysis tool for electromagnetic railgun exterior trajectory is designed and developed.On the basis of the requirement analysis of tool,the overall framework and operation flow of the tool are designed.According to the overall framework,the key modules of the tool are designed,and the tool is developed and actualized under the Visual Studio 2010 environment.It is proved that the tool is practical and feasible by analyzing the electromagnetic railgun firing accuracy.