High Rf Barrel Stiffness And Strength And Thermal Analysis

This thesis takes a national advanced research project as the background. The research focused on stiffness, strength and thermal of high firing rate barrel according to the request of background project.With the continuous firing rate improvement of the artillery auto-machine, the strength, stiffness and heat capacity of the barrel have to be increased. Firstly , the requirements of barrel's strength must be met, so that there will be no plastic deformation. Secondly, when the artillery is fired in certain frequency, it is similar to giving the barrel impact load in certain frequency, the resonance of the barrel should not be ignored with the consideration of the accuracy of the artillery. Thirdly, the barrel is under the impact of the temperature whenever the artillery is fired. Therefore, we can get the temperature distribution of the barrel through thermal analysis of the barrel, and the largest number of launch at certain firing frequency can be predicted. It can provide reference for the following cooling program.With the consideration of the project needs, this work focused on the following aspects based on the design theory of the barrel, modal theory, heat transfer and application of theory:1) Geometrical design of the barrel shape according to the chamber pressure.2) Strength analysis of barrel with method of the theoretical calculation and finite element method.3) Analysis on barrel deflection to achieve the bending degree under the gravity of itself. Modal analysis to get the barrel's natural frequency.4) Thermal analysis of the barrel, The corresponding optimum method was forwarded based on the results of thermal analysis. Thermal analysis of the improved barrel, and the results of thermal analysis in different situations was discussed.