【摘要】 低g值冲击加速度是表征人体冲击耐受程度的一个重要参数,低g值冲击加速度的准确校准直接关系到量值溯源的有效性和可靠性。分析了落锤式、上抛式和碰撞式3种类型冲击激励源的特点,介绍了ISO 16063-13国际标准推荐的激光绝对法冲击校准的测量原理和系统构成,研究了采用精密空气轴承的碰撞式冲击激励源和信号解调算法。校准结果表明,基于ISO标准方法的碰撞式冲击校准系统,能够实现高精度的激光绝对法校准,冲击加速度范围20~10 000 m/s~2,冲击脉宽0.5~10 ms,校准不确定度1%(k=2)。更多还原

【Abstract】 The current situation of low g shock is introduced with three types of shock exciters described.The measuring theory and system set-up using laser interferometry is explained in accordance with ISO 16063-13 with the emphasis on key technology of signal demodulation algorithm and air-bearing shock exciter based on collision.According to calibration results,the primary shock calibration system can achieve expanded uncertainty of 1%,k = 2,in the acceleration range from 20 m/s~2 to 10 000 m/s~2 and pulse duration from 0.5 ms to 10 ms.更多还原