考虑身管初始挠度的弹炮耦合振动特性分析

为研究火炮发射过程中运动弹丸激励下的身管振动特性,以某型火炮为例,基于Euler-Bernoulli梁理论,建立考虑身管初始挠度的移动弹丸-弹性身管耦合振动方程,利用模态叠加法对方程进行求解。基于有限元软件Abaqus以及动力学分析软件Adams建立相应考虑初始挠度的刚柔耦合动力学模型,并对数值计算的结果进行验证。在模型的基础上,对弹丸速度和弹丸质量影响炮口振动特性的规律进行分析。结果表明对于在运动弹丸激励下身管振动问题,身管初始挠度对振动分析结果的影响很大,不可忽略。在考虑身管初始挠度的情况下,弹丸速度越大,对弯曲身管的校直作用越明显,炮口振动幅值越大;弹丸速度一定时,弹丸质量越大,炮口振动幅值越大。

ANALYSIS OF VIBRATION CHARACTERISTICS OF THE PROJECTILE-BARREL COUPLING SYSTEM CONSIDERING THE INITIAL DEFLECTION OF THE BARREL

In order to study the vibration characteristics of gun barrel under the action of moving projectile in gun launching process, taking an artillery gun for example, based on the Euler-Bernoulli beam theory, the coupled equations of vibration of a moving projectile elastic tube coupled with the initial deflection of the tube body are established. Using the finite element software ABAQUS and the dynamic analysis software ADAMS, the rigid flexible coupling dynamic model considering the initial deflection is established, and the numerical results are verified. On the basis of the model, the law of the muzzle velocity and the mass of the projectile affecting the muzzle vibration characteristics are analyzed. The results show that the initial deflection of the tube body has a great influence on the vibration analysis results, and can not be ignored. In the case of the initial deflection of the tube, the larger the projectile velocity is, the larger the muzzle vibration amplitude is. When the velocity is constant, the larger the projectile mass is, the larger the muzzle vibration amplitude is.