转管机枪枪架多目标优化及其对射击精度影响研究

摘要

Aiming at the problem of large elastic deformation of a Gatling gun tripod in shooting process affecting the firing accuracy,the mesh morphing and approximate model techniques were comprehensively used for the multi-objective optimization of the gun tripod to improve its rigidity.The rigid-flexible coupled virtual prototype model for the Gatling gun was built and the shooting process of the gun was dynamically simulated.The correctness of the model was verified through the comparison between the simulation data and the test data.The virtual prototype model for the optimized gun tripod obtained using the mesh morphing technique was established, and the shooting dynamic characteristics of the Gatling gun system before and after optimization were compared.It was shown that after optimization, the vibration angular displacements and velocities of the gun's muzzle in the vertical direction are significantly reduced, and the radius of 70% bullets dispersion circle for 100m firing decreases 12.16%;so the optimized gun tripod can effectively suppress the vibration of the gun system in the vertical direction and improve the density of bullet dispersion.%针对射击过程中转管机枪的枪架弹性变形过大影响射击精度的问题，利用网格变形技术和近似模型技术对枪架结构进行多目标优化来提高其整体刚度。建立了该转管机枪系统的刚柔耦合虚拟样机模型，对其射击过程进行了动力学仿真计算，通过与试验数据对比验证其正确性。将利用网格变形技术优化得到的新型枪架替换原枪架建立虚拟样机模型，对比优化前后机枪系统的动力学特性，机枪枪口高低方向的振动角位移和速度都有明显的降低，机枪百米70％射弹散布圆半径减小了12．16％，说明优化后的枪架能有效抑制机枪系统在高低方向的振动，提高射击密集度。