Due to the evolution of electronic systems in aircraft, the demand for using numerical software tools to analyze the vulnerability of aircraft to their electromagnetic (EM) environment in an early stage of the design process is increasing. In this thesis, focus is put on the development of approaches which support a fast and accurate simulation of EM problems in aircraft using the method of moments (MoM). As the simulation of EM problems leads to high computational cost and memory requirement for increasing problem complexity, fast solvers, such as the multilevel fast multipole algorithm (MLFMA), have been developed over the years. In order to improve the efficiency of MLFMA, methods are proposed, reducing the computational burden by exploiting redundancies in the problem geometry and in the MLFMA formulation. Although the MLFMA accelerates the MoM based field analysis, it suffers from long computation times when considering problems involving multiple exciting external EM fields. Therefore, a method is introduced which overcomes this issue, allowing a fast analysis of aircraft exposed to varying external EM fields. As the evaluation of fields may become the bottleneck of a numerical analysis, a hierarchical and parallel fast evaluation technique is proposed. The MoM accuracy regarding field coupling into aircraft structures is enhanced by applying a coupled integral equation. Moreover, this type of integral equation is extended to account for the field coupling through advanced materials, such as carbon fiber composite, used in nowadays aircraft. Various numerical and experimental examples validate the efficiency and the accuracy of the proposed MoM extensions. A digital mockup of an aircraft serves as an example for demonstrating the decrease of computation time when using the proposed methods. It is shown that differences to conventional MoM techniques are marginal and an increase in efficiency of more than a factor of 100 is achievable. Using generic objects, the accuracy enhancement is confirmed by numerical and experimental tests. The work is closed by the analysis of a real world aircraft. Here, focus is put on simulation-to-measurement correlation and on the discussion of issues arising when analyzing real aircraft.
Accurate and Efficient Algorithms in the Method of Moments for the Analysis of High Intensity Radiated Field Coupling into Aircraft
2014
177 Seiten, Bilder, Tabellen, 163 Quellen
Theses
German
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