基于小波变换的火炮动力学分析  

Gun Dynamics Analysis Based on Wavelet

作　　者：陈强[1] 杨国来[2] 朱张青[1] 

机构地区：[1]南京大学控制与系统工程系,江苏南京210093 [2]南京理工大学机械工程学院,江苏南京210014

出　　处：《火炮发射与控制学报》2009年第2期37-40,共4页Journal of Gun Launch & Control

摘　　要：为了获得弹丸膛内运动的时频综合特性,利用小波变换的方法对弹炮耦合动力学响应进行时频分析研究。建立了弹丸和膛线碰撞的火炮多体系统动力学模型,通过动力学计算,得到了弹丸横向加速度随时间变化的曲线。由于小波变换在时域和频域上均具有良好的局部性,且无需对信号进行时域同步平均,采用连续小波变换对弹丸加速度响应进行了分析,生成了时频相平面图,可以直观地描述弹丸碰撞发生的时刻和能量,为深入分析弹丸的运动状态提供依据。In order to obtain time-domain and frequency-domain chracteristics of projectile movement inbore, the wavelet transform method was used in time-domain and frequency-domain analysis of gun and projectile coupling dynamics response. The dynamics model of gun multi-body system under consideration of collision between projectile and rifle was established. The variation curve of projectile traverse acceleration with time was acquired by use of numerical computation. Because wavelet transform had favorable locality performances in time-domain and frequency-domain, and the signal time-domain average was not necessary, the continuous wavelet transform was applied to the analysis of projectile acceleration response. The chart of time frequency phase plane was plotted to directly describe the energy and time when the projectile collision occurs. The research result can provide reference for extensive analysis of projectile movement status.

关 键 词：固体力学 火炮动力学 小波 时频分析 

分 类 号：TJ302[兵器科学与技术—火炮、自动武器与弹药工程]