一种六维加速度传感器的测量属性分析*

本文研究的六维加速度传感器为并联机构,旨在用于低频作业装备下的小量程加速度测量。为了能够准确地获取传感器的测量属性,采用并联机构的守恒转换的方法求解传感器的刚度矩阵,通过对传感器的简化建立系统的无阻尼自由振动模型,获得传感器固有频率求解的理论表达式,对双悬臂梁弹性元件进行分析,计算获得悬臂梁弯曲应力与上平台加速度加载的关系曲线,利用有限元分析仿真确定传感器的测量范围,经过实验验证,证明该传感器在16 Hz,x轴方向0~10 m/s2的加载状态下传感器测量电压与加速度加载量之间具有良好的线性关系,传感器的线加速度精度为1.3%。

Research on measuring characteristic for a six axis accelerometer

Based on parallel mechanism, the six-axis accelerometer is applied for the small range acceleration measurement under the low frequency environment. In order to obtain the measuring characteristic of the accelerometer, the stiffness matrix is calculated based on the conservative congruence transformation (CCT). By simplifying the structure of the system, a model of the free vibration is established. Resonant frequency of the accelerometer are achieved. By analyzing the structure of the double cantilever beam (DCB), the relation between the stress of the DCB and the acceleration of the moving platform is obtained. Based on the result of the finite element analysis (FEA) simulation, the measuring range of accelerometer is determined. In the experiment, acceleration along the x axle from 0 to 10m/s2 is loaded on the moving platform of the accelerometer, and the frequency is 16Hz. Experimental results show that the output voltage of the accelerometer has good linear relationship with the acceleration loaded on the moving platform, and the acceleration precision of the x axle is 1.3%.