可以有效减少方向误差和提高路径跟踪的精确性。
It can reduce orientation error and improve the accuracy of path tracking effectively.
提出了主应力的偏角误差概念及其计算方法，使主应力方向的精度评定更加真实客观。
Precision estimation of principal direction is more objective by using principal stress deflection error proposed in this paper.
建立了沿不同方向测量圆钢直径时、光线偏折误差的修正函数。
The correction-functions for the light deflection error of bar diameter measurement in several different directions are obtained.
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