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本文通过靶场实测证实:发射时,不能把厚壳钢质弹丸看成是绝对刚体;在引信部位测得的直线加速度与膛压曲线不成比例,且有较大差别;膛内直线加速度为一振荡曲线;在饱口附近及后效期,直线加速度为负,直线惯性力不是产生后座,而是产生前冲。本文在线性定常系统的基本假定下,应用信号、系统理论,对弹丸引信系统进行了分析,提出了弹丸沿炮膛运动的力学模型,建立了弹丸沿炮膛运动从弹底压力到引信部位加速度的传递函数。通过波形分析,证明在炮口附近及整个后效期,直线加速度确实可能为负。初步解释这种现象是由于弹丸系统的弹性和阻尼产生的。本文根据引信典型机构的微分方程,写出了引信机构的传递函数和脉冲响应函数。用脉冲响应函数和激励函数卷积的形式表达引信部位的直线加速度和引信零件的位移,并在此基础上应用离散卷积和快速付里叶变换程序来求引信部位的直线加速度和引信零件的位移,此法特别适用于求复杂环境力作用下引信零件的运动参数。
In this paper, it is confirmed by the shooting range test that the thick-shell steel projectile can not be regarded as an absolute rigid body when it is launched. The linear acceleration measured at the fuse part is not in proportion to the bore pressure curve and has great difference. Curve; in the vicinity of the mouth and after the expiry, the linear acceleration is negative, linear inertial force is not generated after the seat, but to produce a hedge. In this paper, under the basic assumption of linear steady system, the signal and system theory are used to analyze the projectile fuze system. The mechanical model of the projectile movement along the bore is presented. The propagation of the projectile along the bore motion from the bottom pressure to the acceleration of the fuze is established. function. Through the waveform analysis, it is proved that the linear acceleration may indeed be negative near the muzzle and throughout the post-validation period. The initial explanation for this phenomenon is due to the elasticity and damping of the projectile system. In this paper, the transfer function and impulse response function of fuze mechanism are written according to the differential equation of fuze typical mechanism. Using the impulse response function and the excitation function convolution to express the linear acceleration of the fuse part and the displacement of the fuze parts, and based on the discrete convolution and fast Fourier transform program to find the location of the linear acceleration and fuze parts of the fuze Displacement, this method is particularly suitable for seeking the kinematic parameters of fuze parts under the influence of complex environmental forces.