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Application of topography optimization in frequency design of machine
gun barrel and its efficiency on firing accuracy improvement
HUA Hong-liang, LIAO Zhen-qiang, QIU Ming, LI Jia-sheng, SONG Jie
(School of Mechanical Engineering, Nanjing University of Science and Technology,
Nanjing 210094 ,China)
Abstract: To improve the firing accuracy of a machine gun system, we optimized the barrel structure by using topography optimization, and the suitable target mode was confirmed with aids of transient dynamics analysis and modal analysis. Rigid-flexible coupled dynamic analysis and exterior ballistics calculations are carried to investigate the topography optimization efficiency on vibration reduction and finally the firing accuracy. The results show that the use of the new designed barrel structure results in a significant vibration reduction of muzzle, and the vibration in the y-direction that is displacement, velocity, firing angle are reduced by almost 54%, 41%, 38% respectively. In addition to this, the R50 and R70 is greatly reduced from 7.7 cm and 11.6 cm in the initial design to 2.6cm and 6.4cm in the optimal design, with an improvement ratio of about 66% and 44%, respectively. This paper can provide guide for similar weapon structure design.
Key words:barrel; topography optimization; firing accuracy; dynamics; finite element method
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