Gun Barrel Dynamic Characteristics Based On The Fluid-structure Interaction Analysis

With the improvement of the power of the artillery, modern war requires not only enhancing the strength of the barrel, but also improving the life of the barrel. In the process of gun firing, the barrel works under extremely poor conditions, such as high transience and strong load. As far as automatic artillery which points continuously is concerned, improving heat rejection condition and cooling the barrel are very necessary. In this paper, gun's stiffness discussion is the subject, the research on barrel installed cooling equipment by structural mechanics and dynamics is done through the software ANSYS.Main work in this thesis is as follows: First of all, given the need of deep research, the three dimension simplified model of the barrel containing cooling layer is built by ANSYS parameters of the language (APDL). It is the optimization analysis basis of the following step. Secondly, based on engineering fluid-solid interaction theory of structure coupling dynamics, with the superiority of ANSYS in Multiple physics field coupling analysis, the coupling modal analysis are done, which aims at studying the dynamic stiffness of the barrel. Thirdly, according to the Pressure-time curve resulted from interior ballistic simulation, the transient dynamical analysis of the barrel is done. The deformation and stress distribution of the barrel is extracted at particular moment during the stage of projectile acceleration motion. Finally, the connection between cooling layer thickness and barrel stiffness is discussed, and the evaluation index is contrasted under multiple programs. At the same time, barrel weight is taken into account. The barrel contained cooling layer is optimized by ANSYS optimization analysis module, and a reasonable value of the cooling layer thickness is captured.