为了满足对小型跟踪架低成本、短周期和高互换性的要求,提出了采用标准轴承轴系代替现有研磨轴系的轴系改造方法.分析了采用标准轴承后的轴系误差源,根据跟踪架的使用多为远距离探测跟踪等特点,给出变轴线晃动为轴线平移的消差方法.设计了水平轴系实验模型,采用p5级深沟球轴承进行实验测量,并用傅里叶谐波分析方法对数据进行了分析.实验结果表明:水平轴左右轴承安装时,轴承内圈径向跳动最大方向安装在同一方向时,轴系晃动最大误差为2.430″;轴承内圈径向跳动最大方向相差180°安装时,轴系晃动最大误差为6.126″,说明第一种安装方法会使跳动误差同步同周期变化,从而较大地减少轴系晃动.实验结果验证了消差方法的可行性,采用高精度等级轴承并采用提出的消差方法可以满足一般中小型跟踪架的精度要求.%In order to meet the requirements of a tracking gimbal for the lower cost,shorter manufacture periods and higher interchangeable property,a new way of shaft transformation by using standard-bearings to replace thrust bearings was proposed. The axis error sources of using standard-bearings were explained, then according to the principles and characters of the tracking gimbal, an error eliminating method to make the axis sloshing become parallel moving was given. Finally, an experiment model of horizontal axis was designed, and the error of axis adopting zero level deep groove ball bearings was tested and analyzed by the Fourier harmonic analysis method. The experimental results indicate that the maximum error of shafting sloshing has been reduced from 6. 126" to 2. 430", which proves the the feasibility of the proposed error eliminating method. It concludes that the higher level bearings and right fixing plans can meet the precision requirements of small-scale tracking gimbals.
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