形貌优化在机枪枪管频率设计中的应用以及射击精度改进研究

为了提高机枪系统射击精度，将瞬态动力学与模态分析技术相结合，为枪管结构形貌优化选择了合适的目标模态，并对其进行了形貌优化。并采用刚柔耦合动力学与外弹道计算对优化前后机枪系统动力学响应特性、射击精度进行了对比研究。结果表明：采用优化后的枪管结构后，枪口高低方向振动位移、速度、射角最大值分别减少了40%、52%、46%左右，效果良好。并且，机枪射击精度指标R50、R70分别由原先的7.7cm、11.6cm下降为2.6cm、6.4cm，射击精度指标分别提高了66%、44%左右，提升效果较为明显。本文研究，可为同类武器结构设计提供参考。

Application of Topography Optimization in Frequency Design of Machine Gun Barrel and Its Efficiency on Firing Accuracy Improvement

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 ?nally the ?ring 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 7.7cm 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.