动能贯穿混凝土多层靶标加速度信号失真修复

Recovery of distorted shock acceleration records for investigating kinetic energy perforation of multi-layered concrete slabs

通过对动能贯穿混凝土多层靶标实验随弹加速度计实测的加速度信号失真情况分析,辨识出零点漂移误差是影响积分算法的最主要误差因素,灵敏度变化的影响相对较小。零点漂移误差可通过自由飞行段加速度计输出进行补偿。而灵敏度误差则可利用实测的入靶速度作为膛内加速过载段积分的速度参考值进行补偿。给出5种冲击加速度误差补偿方案。在对贯穿前零偏误差和传感器灵敏度误差同时进行补偿后,其解算结果最优。弹体刚性加速度的一次积分与二次积分分别与实测的出靶速度和实际位移保持较好的一致性,相对误差分别为-2.7%和0.2%。

The distorted penetration deceleration-time curve measured by the recorder-borne piezoresistive high-g shock aecelerometer is analyzed. Zeroshift rather than the scale factor was identified as the principal factor in the integration algorithm. Furthermore, zeroshift can be canceled directly using accelerometer output in free-fly. While the scale factor error should be corrected by means of comparing the integrated velocity in barrel with the measured impact velocity. Five compensation schemes are provided. The best performance was achieved by the correction scheme which compensates the both error （zeroshift before penetration and scale factor error） simultaneously. The single and double integrations of compensated acceleration were consistent with the measured residual velocity after perforating and the displacement, and the relative errors were -2.7% and 0.2% respectively.