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positional error (鐘表等的)位置誤差。

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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 為進一步提高工作臺的定位精度,本文建立了基于遲滯模型的閉環掃描控制系統,并對系統的定位能力進行了實驗,實驗結果表明,系統最大定位誤差減小至0 . 1 % ,該控制系統兼顧了系統的動態響應和高定位精度。

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 本論文重點分析了顯示單元中成像空間的構造,提出屏幕按正弦曲線運動的方式來構造成像空間,用線性近似的方法得到均勻的圖像,并分析了由于線性近似帶來的最大屏幕位置誤差。

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 借鑒測繪學科中衡量點元位置不確定性的方法,分別用橢圓和橢球來表示二維目標和三維目標的位置誤差散布的不確定性區域。

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 大型工件幾何尺寸、形位誤差的測量和控制,是保證整套設備質量的關鍵因素之一,因而,大型零部件及組裝件的整體幾何參數和形位誤差的測量、零部件加工的在線測量,就成為急需解決的問題之一。

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 % 對系統的定位能力進行了實驗,實驗結果表明,工作臺的定位精度明顯提高,系統定位誤差由10 %減小至1 . 5 % 。