小口径火炮弹炮耦合动态响应有限元时程分析  

Finite-element time-history analysis for dynamic response of small-caliber guns with projectile-barrel coupling

作　　者：苏忠亭[1] 徐达[1] 李晓伟[2] 韩振飞[1] 

机构地区：[1]装甲兵工程学院兵器工程系,北京100072 [2]北京京航计算通讯研究所,北京100074

出　　处：《振动与冲击》2012年第23期104-108,147,共6页Journal of Vibration and Shock

基　　金：军内科研计划项目

摘　　要：基于移动荷载思想应用有限单元法和悬臂梁理论研究了小口径火炮弹丸膛内运动过程中的身管振动情况。应用圆柱坐标系将身管结构离散为标准的扇形单元,依据弹带凹槽部和凸起部沿膛线运动过程对各单元进行编号,将弹带视为弹塑性体,凹槽部应用线性简化模型,凸起部应用Dubowsky模型,身管简化为柔性变截面悬臂梁,考虑弹带挤进过程和刚体前定心部对内膛的瞬态碰撞规律,将弹丸膛内运动过程分为三个阶段,根据工程梁理论建立了移动弹丸作用下身管径向振动的时变动力学方程。将计算结果与炮口振动实验数据相比较,可知在忽略火炮后坐、摇架、炮塔等结构影响下,弹炮耦合模型比较准确。The tube vibration of small-caliber guns when projectile moving along a rifling was studied with finite element method and cantilever beam theory based on moving load idea. Firstly the tube structure was discretized into normal sector elements in cylindrical coordinate system numbered according to the moving process along a rifling of concave parts and bulge ones of projectile rotating band. Then, the moving process along a rifling was separated to three phases, considering driving band squeezing process and transient collision laws between rigid front band and inside barrel, and taking projectile rotating band as elastoplastics, concave part as a linear simplified model, bulge one as a Dubowsky model and tube as a flexible non-uniform cantilever beam. Finally, the time-variant dynamic equations of the tube radial vibration subjected to a moving projectile were set up with Euler-Bernoulli beam theory. Ignoring the influence of recoil, cradle and barbette, the projectile-barrel coupling model was proved to be a better one close to the reality by comparing with the tube vibration test data.

关 键 词：小口径火炮 弹炮耦合 有限单元法 悬臂梁 Dubowsky模型 

分 类 号：TJ301[兵器科学与技术—火炮、自动武器与弹药工程]