Research And Analysis On The Stability Of The Machine Gun By The Cross-sectional Shape Of The Tripod

In modern warfare,gun mount is an important component of squad weapons.In order to reduce the burden on soldiers,there are high requirements for lightweight.However,the stability of the gun mount directly affects the shooter's shooting accuracy when using the machine gun.How to reduce the weight of the gun mount as much as possible without affecting the stability of the gun mount has always been an important direction of gun mount research.Previous studies mostly start with the structural design of the gun mount,such as a buffered hoe mechanism,or change the material of the gun mount,such as using composite materials to make the gun mount.Taking a certain type of tripod and machine gun as the research object,the vibration frequency of the tripod is obtained after the modal calculation with the finite element software ABAQUS.Then the dynamic simulation is carried out with ADAMS software to obtain the displacement data of muzzle jump.On the premise of the same cross-section area of the tripod legs,the cross-section shape of the tripod legs is changed,and the dynamic simulation and research are completed with the rectangular cross section legs,regular hexagon cross section legs,regular octagon cross section legs and circular cross section legs respectively.The research results show that when the cross-section of the tripod legs is regular hexagon,the machine gun tripod system presents most stability.At the same time,on the basis of the regular hexagonal cross-section tripod,the wall thickness of the gun mount were modified,but the area of the tripod section was kept unchanged,and the relationship between the stability of the gun mount and the wall thickness was discussed.Afterwards,based on the research conclusions,a new tripod leg was designed for modal testing to analyze and collect vibration signals.Based on the results of finite element calculations,the measurement points and excitation points were reasonably estimated and arranged.The modal test of the gun mount and the machine gun system is carried out by means of single-point excitation and multi-point measurement,and the modal data of the overall system are obtained to verify the rationality of the hypothesis in this paper.Through the theoretical hypothesis and experimental verification of the modal of the machine gun mount system,on the one hand,it is proved that the natural frequency of the machine gun system and the stability of the tripod are related to the crosssectional shape and the wall thickness of the tripod.On the other hand,the verified results also provides a new direction for future gun mount optimization and dynamic modification.