In order to improve the muzzle velocity of the pill and the power of the gun, the barrel is lengthened in the modern tank gun. But the dynamics characters of the barrel has been changed by these methods, and the firing accuracy may be out of control. Therefore, it is an important work for designer to master the libration character and distribute libration frequency in reason. The paper built virtual prototyping model of some length tank gun barrel and gets its libration mode parameter and design bug. The barrel reach require after some mend. This result offers theorial reference for the dynamical response analyses and structure optimize design of tank gun barrel.%加长身管是坦克炮提高弹丸的初速和火炮威力的常用手段,但该措施也使得坦克炮炮身动态特性发生变化,若设计不合理将使其射击密集度超出可控的范围.因此,掌握坦克炮炮身的振动特性并使其固有振动频率合理分布是坦克炮发射动力学和动态设计研究的重要内容之一.在分析了坦克炮身管振动对射击密集度的影响的基础上,建立了某型加长身管坦克炮的有限元模型,通过仿真计算发现其模态参数和设计的不合理之处,对改进后的坦克炮身管进行了仿真分析,证明其达到了设计的要求,为坦克炮身管的动力响应分析和进一步的结构优化设计提供了理论参考依据.
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