Vibration characteristics analysis of the ammunition belt of the aircraft gun under maneuver loads

Abstract During firing, the ammunition belt of an aircraft gun undergoes intense motion inside the ammunition box. Owing to structural constraints, direct observation of this motion is difficult. To investigate the differences in the dynamic behavior of the ammunition belt under ground-firing and airborne maneuvering conditions, a dynamic model was developed using a modular modeling approach based on the vector bond graph method. The state equations of the ammunition modules were derived, enabling the simulation of vibration responses and model-predicted motion trajectories during firing. The reliability of the model was evaluated through ground-firing experiments. Subsequently, the vibration characteristics of the ammunition belt under maneuver loads were analyzed. The simulation results indicate that maneuver loads have a significant influence on the predicted motion state of the ammunition belt, with the peak vibration acceleration increasing by 189% for the 18th round under the investigated conditions.