Abstract: In order to study the characteristics and influence factors of recoil effect of gun in the man-gun system, two dynamic models for the recoil effects of gas-operated and simple blowback bolt type guns for firing at the standing position are established in consideration of man-gun interaction. The models are based on gun interior ballistic properties, recoil mechanism and bolt movement in different automatic ways, rigid-body dynamics and collision dynamics. The gun recoil force, recoil velocity and shoulder horizontal displacement in man-gun system are numerically and experimentally analyzed. The research results show that the rules of the changes of gun recoil force and the shooter' recoil velocity and displacement withe recoiling time, and the number of occurrences and time of the maximum are not same for two different kinds of automatic gun.

Key words: ordnance science and technology, firearms, recoil effect, dynamics, numerical analysis