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方位轴系编码器的定向误差作为光电经纬仪的系统误差,是可以在测量前就测试出来并加以修正。但是属于系统误差的定向误差在工作过程中经常发生随机变化,必然会对测量精度造成很大的影响。文中分析认为调平机构与基座连接时的连接杆与连接孔之间的间隙,是该误差发生变化的原因;在分析了早期的解决方案的基础上,提出了调平机构与抗扭薄膜组合的机械结构模式,并计算了在调平机构±7′的角度范围内,抗扭薄膜的弯曲应力、剪切应力均能够满足许用应力,抗扭薄膜内外圆之间的转角小于编码器1″的精度,这样既解决了方位轴线角度调整的问题,也保证了在4 000 N.m的力矩作用下,定向误差没有发生变化。实践证明,该方法对解决定向误差的变化是行之有效的。
Directional axis encoder error as a systematic error of theodolite can be measured and corrected before measurement. However, directional error, which belongs to systematic errors, often changes randomly during the course of work, which will inevitably have a great impact on the measurement accuracy. This paper analyzes the reason that the gap between the connecting rod and the connecting hole when the leveling mechanism is connected with the base is the reason for the change of the error. Based on the analysis of the early solutions, the leveling mechanism and the anti-twist film Combined with the mechanical structure model, the bending stress and shearing stress of the anti-twist film can meet the allowable stress within ± 7 ° of the leveling mechanism. The rotation angle between the inner and the outer anti-twist film is smaller than that of the encoder 1 ", which not only solved the problem of azimuth adjustment of azimuth, but also ensured that the orientation error did not change under the torque of 4 000 Nm.It has been proved that this method is effective in solving the change of orientation error .