高量程加速度计动态线性校准系统

Dynamic linearity calibration system for accelerometers with high measurement range

设计了双弹头霍普金森杆用于精确标定高g值加速度计的动态线性参数。基于一维应力波传播理论和弹性波叠加原理,分析了双弹头霍普金森杆为不同尺寸时对获取所需激励加速度信号的影响。利用ANSYS/LS-DYNA有限元仿真软件对不同设计条件下双弹头霍普金森杆的冲击效果进行了仿真分析。通过对不同影响因素的对比,确定了结构参数,设计了直径为30mm,长度为1 200mm的双弹头霍普金森杆,即高量程加速度计动态线性校准系统。利用设计的双弹头霍普金森杆对高量程加速度计进行了动态线性校准和试验验证,结果显示加速度计动态线性误差在5%以内,证明了设计的装置可对高量程加速度计进行动态线性校准,校准结果基本满足冲击校准的要求。

A dynamic linearity calibration system, dual warhead Hopkinson bar,was designed to calibrate the dynamic linear parameters of a micro accelerometer with high measurement range accurately. On the basis of one-dimension stress wave theory and elastic wave superposition principle, the influences of the dual warhead Hopkinson bar with different sizes on the required acceleration signals were analyzed. The ANSYS/LS-DYNA was employed to simulate the shock effect of the dual warhead Hopkinson bar under different design conditions. According to analysis and simulation on different factors, the design parameters were determined. Then, a dynamic linearity calibration system（dual warhead Hopkinson bar） for accelerometers with the diameter of 30 mm and the length of 1 200 mm was designed. The dual warhead Hopkinson bar was used in the dynamic linearity calibration of an accelerometer with high measurement range. The results indicate that the dynamic linear error of the accelerometer is within 5 %, which verifies that the dual warhead Hopkinson bar designed is feasible for dynamic linearity calibration of the accelerometers with higher measurement ranges,and the calibration results satisfy the requirements of shock calibration.