Research On Methods Of Analyzing Electromagnetic Compatibility Problem Of Missile On Ship Platform

In order to analyze the system stability of the ship platform,it is necessary to obtain its electromagnetic characteristics.The traditional method is to measure it in a real electromagnetic environment.However,with the continuous improvement of the modern ship's integration,the cost of measuring is increasing,it consumes a lot of manpower and material resources,and it has a certain degree of danger.Therefore,it is of great value for electromagnetic simulation analysis of complex ship platforms.However,such problems bring huge challenges to the current numerical simulation technology.On one hand,the scale of the shipplatform often reaches hundreds or even thousands of wavelengths,which is a electric large size problem.On the other hand,due to the continuous improvement of platform integration,there are many complex fine structures that belong to multi-scale problems.In the face of these two challenges,the conventional integral equation method based on the method of moments cannot be used,and the multi-level fast multipole method with the ability to solve electric large size problem often fails to converge when analyzing multi-scale targets.In order to provide an effective solution to meet the above-mentioned requirements,we mainly study the fast algorithm for analyzing the electromagnetic compatibility problem of multiple aircrafts and missile-loaded ship platforms.By improving the traditional multi-level fast multipole method to avoid the above disadvantages,an efficient solution is provided,and under the condition of ensuring the accuracy of results,electromagnetic analysis of such problems can be realized with less hardware resources.First,domain decomposition method is used as an effective method to solve such problems.we will use a new domain decomposition method to improve it,by simplifying the processing of the boundary elements,then combine it with an adaptive cross approximation algorithm to speed up the processing of its impedance matrix and improve computing efficiency.Second,due to the existence of multi-scale structures on complex ship platforms,the matrix condition number obtained by using the above traditional surface integral equations and conformal region decomposition methods is poor,and it is often not possible to converge in iterative solutions.In order to solve this problem,a discontinuous Galerkin method based on the surface integral equation is given.Compared with the traditional method,this method allows the mesh to be non-conformal and gives the mesh a great deal of flexibility.In addition,in order to realize the electromagnetic simulation of ship targets with multiscale structures,a discontinuous Galerkin method and a multi-level fast multipole method are combined to obtain a discontinuous Galerkin fast multipole method.This method not only has the computational efficiency of multi-level fast multipole method,but also can solve the non-convergence problem brought by multi-scale structure.In order to further improve the computational efficiency of the method,the optimization is performed from two aspects.On one hand,the method is parallelized to make full use of the computing ability of the multi-core processor;on the other hand,the iterative solution time is reduced by improving the condition number of matrix by preconditioning.After SAI preconditioning,this method has the ability of rapid convergence in the iterative solution process.Numerical results was used to verify the correctness and efficiency of the method.At the end of this thesis,the software implementation of the method described in the thesis is given.The required runtime environment,software workflow and solver-related parameter configurations are described in detail.And the corresponding examples are provided to give a clear explanation with a introduction of the relevant output files.