基于双弹头Hopkinson杆的高g值加速度传感器的动态线性分析

Dynamic Linear Analysis of High-g Accelerometers Based on Dual Warhead Hopkinson Bar

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。

It analyzes the dynamic linear testing principle of high g acceleration sensor and verifies the reliability ofthe dual warhead Hopkinson bar. At the same time,using dual warhead Hopkinson bar laser interference impact ex-periment device measures the high g acceleration sensor of dynamic linearity. This method is taking dual warheadHopkinson bar as a signal generator. Firing two bullets（inner and outer） with dual chamber signal generator. Whentwo bullets hit the dual warhead Hopkinson bar respectively,by controlling the impact acceleration generator,pro-duce the same acceleration pulse frequency which peaks are aouterand ainner. The measured output peak accelerationare Aouterand Ainner. Keep the same firing conditions,when the inside and outside bullet impact Hopkinson bar at thesame time,the acceleration pulse frequency is the same and the peaks are aouterand ainner. According to the stresswave superposition principle,the peak acceleration of the superposition is atotal=aouter＋ainner,the measured accelerationsensor acceleration peak corresponding to the output is Atotal. So we get ΔY =（Aouter＋Ainner）-Atotal. By analyzing the rangeof ΔY,evaluates dynamic linearity of accelerometer.