Thermo-mechanical finite element analysis and design of tail section for a ballistic missile

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2012

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Güler, Togan Kemal

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During the flight of missiles, depending on the flight conditions, rotation of missiles around its centerline can cause instabilities. To override this issue, missile generally is designed in 2 sections. In the missile, the rear tail section and the front section are to rotate freely by means of bearings. Tail section on which bearings are mounted is designed according to thermal loads due to flow of hot gasses through the nozzle and mechanical loads due to inertial load, interference fit and thread preload which appear during flight of missile. The purpose of this thesis is to determine the most suitable structural parameters according to the flight conditions of missile. The geometrical and load parameters which have effect on the results were determined. Finite element model is formed by using FEA software. After that, transient nonlinear thermo-mechanical analyses are performed and the most effective parameter on VM (Von-Mises) stress and force is determined. DOE (Design of Experiments) method was used to determine the most suitable values for the structural parameters. Totally 27 different configurations are studied to achieve to the most suitable values for variable set. It is observed that VM stress and force results for all configurations are within the ±%5 ranges. So this means parameters don’t affect the systems response very much. By taking manufacturing processes into consideration, configuration with the highest bearing inner/outer ring interference is taken. From the comparison of the results, the most suitable configuration is obtained after checking forces and VM stress on the bearings.

Subject Keywords

Ballistic missiles., Bearings (Machinery)., Bearings (Machinery)

URI

http://etd.lib.metu.edu.tr/upload/12615165/index.pdf
https://hdl.handle.net/11511/22201

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

T. K. Güler, “Thermo-mechanical finite element analysis and design of tail section for a ballistic missile,” M.S. - Master of Science, Middle East Technical University, 2012.