弹丸发射过程中身管的振动对射击精度有很大影响，为了掌握身管振动的规律，将身管简化为悬臂梁模型，在此基础上建立了身管横向振动方程，运用模态分析法求解系统动力响应。针对某火炮不同装药量身管振动进行了数值仿真，对不考虑膛内气体对身管作用和考虑膛内气体对身管作用两种情况进行了比较。求解过程中弹丸的位移、速度和加速度均为实际数据。结果表明，静扰度对身管的振动特性有很大影响，静扰度为0时，弹丸初速越高，弹丸出炮口阶段炮口振动幅度越小，膛内气体对身管的作用力能有效减小发射期间身管的振动幅度。%The vibration of barrel has considerable influence on firing accuracy. To obtain the law of the barrel vibration, the barrel is considered as a cantilever in this paper, then its transverse vibration equation is established and the force response can be figured out by using modal analysis method. The vibration characteristics of the barrel are numerical y simulated for different charge weight, besides, two situations the barrel with or without gas pressure are compared. ln solving process, the displacement, velocity and ac-celeration of projectile are real datum. The simulation results indicate that static offset affects the vibration characteristics very much. The higher rprojectile′s initializing speed is, the smal er amplitude of the barrel′s vibration and effect of gas pressure are, which can decrease the amplitude of vibration considerably.
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