超小型机载稳定平台轴系精度分析

The Axial Accuracy Analysis of Stabilized Platform for SUAV

超小型机载稳定平台的轴系精度在很大程度上决定着设备的定位精度。为了提高设备的定位精度,需要对平台的轴系精度进行严格地控制。这要求设计轴系时,在现有加工水平和轴承精度的基础上,充分保证轴系具有高的回转精度。以俯仰轴系径向回转精度为例,分析了轴系径向回转精度的结构因素,并按照标准不确定度B类评定方法,对其结构参数的标准不确定度进行了计算,可得俯仰轴系径向回转轴线的扩展不确定度为0.014mm,满足编码器安装对轴系的精度要求。通过20台套超小型机载稳定平台轴系径向跳动检测数据,对轴系精度不确定度评定的结果进行了验证。数据与评定的结果一致,满足编码器安装精度±0.015mm的指标。结果表明对轴系精度的分析和对其结构的设计合理。

The axial accuracy of stabilized platform for SUAV （Super-mini Unmanned Aerial Vehicle） greatly determines the positioning accuracy of the whole equipment.In order to improve the positioning accuracy of the equipment,the axial accuracy of stabilized platform must be strictly controlled.It is required in the design axis,to guarantee the axis with high rotation accuracy on the basis of the existing lever of processing and bearing standard parts precision.Taking radial rotate precision of the pitch axis as an example,it analyzes the structural factors of radial rotate precision of the pitch axis,and calculates the standard uncertainty of the structural parameters,and obtains expanded uncertainty of radial rotate precision of the pitch axis which is 0.014mm,which meets the requirement of installing accuracy of the encoder.Through radial runout data on the axis of the twenty sets of stabilized platform for SUAV,the uncertainty assessment results of the axial accuracy are verified.The data and assessment results both meet the index of the encoder installing accuracy of ±0.015mm.The results show that the analysis of the axial accuracy and structure design of the axial system are both reasonable.