Abstract: The vertical ammunition cabin possesses the functions of ammunition storage, recognition and automatic selection. The ammunition vertically placed in the cabin is circularly dragged along the optimum ammunition trajectory by the drive chain. In order to analyze the dynamic properties of drive chain and the stability of ammunition, all links of drive chain and the double-row rollers of ammunition rack are simplified as spring-damper elements. The full dynamics models of drive chain and the stability model of ammunition are established by use of multi-body dynamics and kineto-elastodynamics methods. A numerical simulation of the full dynamics models is performed by adopting Matlab software. The stability model of ammunition is solved. Simulated results show that the velocity and acceleration of drive chain fluctuate within a small range. The dynamic response and drastic characteristic of centrifugal forces are dominated by the shape feature of the trajectory. The normal stability of ammunition is influenced by the drastic characteristic. The tangential stability is determined by the inertia forces of ammunition and the dynamic parameters of drive chain. The analysis shows that the ammunition has high normal and tangential stability. The tangential accelerations of chain and the normal accelerations of ammunition rack are measured. It can be found that the measured data are consistent with the simulated results. Key

Key words: ordnancescienceandtechnology, verticalammunitioncabin, drivechain, spring-dampingsystem, multi-bodydynamics, stabilityanalysis