Dynamic analysis and optimization of vehicle mounted machine gun brackets during moving firing

DOI:	10.11809/bqzbgcxb2023.07.012
Keywords:	moving firing; bracket; stiffness; parametric modeling; structure optimization; stiffness matching
Abstract:	A bracket is the main load bearing component of a vehicle mounted machine gun, and its stiffness and dynamic performance will have a great impact on vehicle mounted machine gun shooting. Based on road roughness theory and launch dynamics theory, this paper establishes a dynamic model of a 12.7 mm vehicle mounted machine gun during moving firing. A simulation analysis of ten round continuous firing process of a vehicle mounted machine gun bracket at the limit angle of firing and the state of flat firing is carried out respectively. Aiming at reducing the quality of the bracket structure and reducing the staggered deformation of the bracket support plate when it is moving, the optimization design of the bracket structure is carried out by combining topological optimization analysis and parametric modeling, and the mechanical properties of the bracket before and after optimization are compared. The analysis shows that the bracket working condition is the worst when the machine gun is fired flat, and the bracket meets the strength requirement. The staggered deformation of the bracket support plate causes a muzzle offset of 0.011 3 mm. Through the optimized design of the bracket structure, the structure mass reduces by 31.82%, the stiffness match of the bracket support plate is improved, and the staggered deformation of the support plate reduces by 85%. It is instructive to the design of vehicle mounted machine guns and remote control weapon stations, which provides reference for the design of other airborne weapons and remote control weapon stations.
Published:	2023-07-28
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