Turret Structural Dynamics Of Nonlinear Finite Element Analysis

This thesis focuses on structural dynamics analysis of a self-propelled howitzer's dome cupola with nonlinear finite element method with the theory of structural dynamics and nonlinear finite element, researches the dynamics response and characteristic of the self-propelled howitzer during the firing process and hopes to find out some factors which would affect the capabilities of the self-propelled howitzer from the point of view of dome cupola structure. The main contents are as follows: Building the 3D model of the self-propelled howitzer, and creating finite element meshed models of the dome cupola and some other parts of the self-propelled howitzer based on the 3D model. Creating finite element meshed model of dome cupola with shell elements, elevating part with shell elements and beam elements, and carrier with shell elements and beam elements. Former processing was done with I-DEAS and then translates finite elements meshed models into ABAQUS. Creating structural dynamics analysis model of the self-propelled howitzer with nonlinear finite element method, including severe nonlinear contact, for example contact between gun tube and cradle rail, contact between gun breech and cradle, and contact between carrier and ground. Simulating balancing machine , elevating mechanism and recuperator with nonlinear spring elements, and simulating the complicated connections between each parts: Rationality and disadvantage of the finite model is studied. Using the implicit time integration program to obtain the transient response of the dome cupola and the whole howitzer during firing at firing conditions of 0° elevating angle and 0° direction angle and at 65~0 elevating angle and 0° direction angle, getting dynamic stiffness and strength of dome cupola, and finding out the characteristic of the dome cupola in work through analysis and comparison of the results obtained by simulation.