基于双弹头Hopkinson杆的高g值加速度传感器的动态线性分析

发布时间：2019-03-18 16:58

【摘要】：分析了高g值加速度传感器动态线性的测试原理并对双弹头Hopkinson杆的可靠性进行了验证;同时利用双弹头Hopkinson杆激光干涉冲击试验装置测量了高g值加速度传感器的动态线性。该方法是将双弹头Hopkinson杆作为冲击加速度发生器,用双膛冲击发生器发射两个子弹(分别为内、外弹),当两子弹分别单独与双弹头Hopkinson杆相撞时,通过控制冲击加速度发生器,使产生的加速度脉冲频率相同且峰值分别为a外、a内,测得加速度传感器对应输出加速度峰值分别记为A外、A内;保持相同的发射条件,当内外弹同时与Hopkinson杆相撞时,使两子弹作用于细杆上的冲击加速度脉冲的频率相同且峰值仍分别为a外、a内;根据应力波叠加原理,则叠加后产生的加速度峰值为a总=a外+a内,测得加速度传感器对应输出的加速度峰值记为A总;从而可以求出ΔY=(A外+A内)-A总,通过分析ΔY是否在所要求的范围内来说明被测加速度计的动态线性。
[Abstract]:The testing principle of dynamic linearity of high g acceleration sensor is analyzed and the reliability of dual warhead Hopkinson rod is verified. At the same time, the dynamic linearity of high g acceleration sensor is measured by using the laser interference impact test device of dual warhead Hopkinson rod. In this method, the double-warhead Hopkinson rod is used as the impact acceleration generator, and two bullets (inside and outside) are fired by the double-chamber impact generator. When the two bullets collide with the double-warhead Hopkinson rod separately, the impact acceleration generator is controlled by controlling the impact acceleration generator. When the frequency of the acceleration pulse is the same and the peak value is outside a, the output peak value of acceleration sensor is recorded as A outside and A inside, respectively, and the output peak value of acceleration sensor is recorded as A outside and A inside, respectively. When the internal and external projectile collides with the Hopkinson rod at the same time, the frequency of the impact acceleration pulse on the thin rod is the same as that of the two bullets, and the peak value of the impact acceleration pulse on the thin rod is still inside and outside of a, respectively. According to the superposition principle of stress wave, the acceleration peak value produced after the superposition is a total = a outside a, and the acceleration peak value corresponding to the output of the acceleration sensor is recorded as A total. Thus, 螖 Y = (A outside A)-A total can be obtained, and the dynamic linearity of the accelerometer can be explained by analyzing whether 螖 Y is within the required range.
【作者单位】：中北大学电子测试技术国防科技重点试验室;中北大学仪器科学与动态测试教育部重点试验室;
【基金】：国家自然科学基金杰出青年项目(51225504)
【分类号】：TH824.4;TP212

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