The connection between contact geometry and fatigue in tapered roller bearings utilized in the railroad environment is still of interest. Roller bearings for railroad applications are typically precision ground with crowned contact geometries to prevent edge loading of components. This normally results in completely elastic Hertzian contact stresses under standard railcar loads. However, under extreme load conditions, detrimental edge loading has been known to occur. It is proposed to develop a tool, using finite element analysis, that can be utilized to optimize complex raceway crown geometries for severe applications. A successful implementation of this tool is presented and validated using proven Hertzian contact theory. Correlation within 5% of the ultimate surface and subsurface stress magnitudes, using finite element modeling, in contrast with proven contact theory is achieved. In addition, analyses of other load conditions and contact geometries in order to illustrate the practical application of the tool are exhibited.

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Diploma thesis concerns in the first part about current knowledge in the field of electromagnetic waves, the history, development and distribution of radar, radar antenna types and distribution of structure radars. The second part deals with the problem formulation and analysis. The third part defines the specific goals of diplomas thesis and the fourth part proposes a solution methode. Design and design selection is included in fifth part. The sixth section analyze selected variant and describes its components. Final seventh part contains design assessment of structural, technological and economic aspect.