Abstract: Traditional mechanics model for ammunition belt system is usually simplified as a motion in a plane, which has a limitation of analysis of the latitudinal motion and cannonball fleeing. The longitudinal and latitudinal mechanical characteristic of the ammunition belt system with helical guider is discussed. A multi-body system dynamic model including clearance joints is obtained for the ammunition belt system. In the spring-damp model, a virtual spring connecting the two contact points is assumed to simulate the impact and contact. The simulation and experiment are finished, which indicates that the above model can well simulate and estimate the mechanical characteristic.

Key words: Ammunition belt, Clearance joints, Helical guider, Multi-body system dynamic model