基于矢量分解的三轴高g值加速度计灵敏度系数校准方法  

Calibration of Sensitivity Coefficient of Three-dimensional High-g Accelerometer Based on Vector Decomposition

作　　者：吴倩 郭伟国[1] WU Qian;GUO Weiguo(School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China)

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《兵工学报》2021年第7期1535-1543,共9页Acta Armamentarii

基　　金：国家自然科学基金项目(11872051)。

摘　　要：为产生同步可计量的三轴加速度过载脉冲,实现对三轴高g值加速度计灵敏度系数的校准,对Hopkinson杆原理中的一维标准杆端面斜面设计,将三轴加速度计置于斜面上。基于理论分析、有限元分析软件Abaqus,数值仿真计算了加速度计灵敏度系数,并进行了试验验证。结果表明:采用一维标准杆的斜端面设计,容易实现三轴高g值加速度计灵敏度系数校准,三轴加载脉冲物理同步化以及轴间解耦;对三轴加速度计与标准杆过渡关系研究,通过优化设计,可以实现高g值加速计三轴不同幅值的灵活校准;不同斜面角度以及加速度计安装角度会引起矢量分解变化,对脉冲构型产生影响,最优的斜面角度是45°;通过对标准杆单轴加载,以及斜端面的矢量分解原理,可以实现对三轴高g值加速度计灵敏度系数的动态校准。In order to generate synchronous measurable tri-axial acceleration overload pulse and calibrate the sensitivity coefficient of three-dimensional high-g accelerometer,Hopkinson bar system is designed to a cylindrical bar with one bevel end on which the accelerometer is placed.The Hopkinson bar system was theoretically analyzed,and simulated and tested by using Abaqus finite element software.The results show that the Hopkinson bar system is used easily to realize the sensitivity coeficient calibration of three-dimensional high-g accelerometer,the synchronization of three-axis loading pulse and the decoupling between axes;according to the optimization design,the different amplitudes of the three-axis high-g accelerometer can be calibrated by analyzing the relationship between the three-axis accelerometer and the standard rod;and different slope angles and accelerator installation angles will cause the changes in vector decomposition,which will affect the pulse configuration.The slope angle with the minimum error is 45°in numerical simulation.Finally,the sensitivity coefficient of three-dimensional high-g accelerometer can be calibrated by loading the standard uniaxial bar and decomposing the vector on inclined plane.

关 键 词：三轴高g值加速度计 斜端面Hopkinson杆 矢量分解 校准 

分 类 号：O347.41[理学—固体力学]