基于模态分析和经验模态分解的弹体加速度处理

摘要

Aiming the fact that there is no effective and accurate processing method for processing air gun and missile acceleration signal,a method based on modal analysis and empirical mode decomposition (EMD)was proposed.The method combined with modal analysis and the empirical mode decomposition (EMD)algorithm to obtain the projectile structural response and resonance during the gas gun launching process the,the structural response of missile body removed from the measured acceleration signal,so as to more accurately get the change of the acceleration of projectile rigid body.By quadratic integral of acceleration,the displacement and the rela-tive error of the actual schedule was less.Testing results showed that the method was accurate and effective.%针对气体炮发射过程中弹体加速度信号目前尚无有效的、准确的处理方法,提出了基于模态分析与经验模态分解算法(EMD)的气体炮发射过程弹体加速度信号处理方法.该方法结合模态分析与EMD获得气体炮发射过程弹体结构响应与谐振,再将弹体结构响应从实测加速度信号中剔除,从而较为精确地获得弹体的刚体加速度变化情况.通过对加速度进行二次积分得到的位移与实际行程之间的相对误差较小,试验表明,通过该方法处理的弹体加速度信号准确有效.