Experiments are desinged to prove the precision of the system . the experimental results demonstrate that the position precision is improved apparently , and the positional error of the system reduces from 10 % to 1 . 5 % 对系统的定位能力进行了实验,实验结果表明,工作台的定位精度明显提高,系统定位误差由10 %减小至1 . 5 % 。
2.
It is one of the pivotal factors to measure and control the geometrical size , shape error and positional error in order to ensure the device quality . so the online measurement of their geometrical size and shape error and positional error is the problem to be solved 大型工件几何尺寸、形位误差的测量和控制，是保证整套设备质量的关键因素之一，因而，大型零部件及组装件的整体几何参数和形位误差的测量、零部件加工的在线测量，就成为急需解决的问题之一。
3.
Based on the method expressing the positional uncertainty of point entities in surveying and mapping , uncertainty ellipse was employed to characterize the uncertainty region for the error dispersal of 2d target ' s position , and uncertainty ellipsoid for the 3d target . 1 - uncertainty ellipse was derived from positional error covariance 借鉴测绘学科中衡量点元位置不确定性的方法，分别用椭圆和椭球来表示二维目标和三维目标的位置误差散布的不确定性区域。
4.
This dissertation emphasizes on the creation of image space , the author present a display system in which screen moves with a sinusoidal velocity profile to create image space . this paper uses linear approximation to make the system display homogeneous graphic and analyzes worst - case positional error due to linear approximation 本论文重点分析了显示单元中成像空间的构造,提出屏幕按正弦曲线运动的方式来构造成像空间,用线性近似的方法得到均匀的图像,并分析了由于线性近似带来的最大屏幕位置误差。
5.
To improve the precision of the piezoelectric stage further , a scanning close loop system based on the mathematical model is studied and designed . experiments are also desinged to prove the precision of the close loop system . the experimental results demonstrate that the positional error of the system reduces to 0 . 1 % , and the close loop system has high dynamic performance and position precision 为进一步提高工作台的定位精度,本文建立了基于迟滞模型的闭环扫描控制系统,并对系统的定位能力进行了实验,实验结果表明,系统最大定位误差减小至0 . 1 % ,该控制系统兼顾了系统的动态响应和高定位精度。
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