Uncertainty Experiment for Large Scale Measuring Equipment

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Uncertainty Experiment for Large Scale Measuring Equipment

更新时间：2025-05-08

- Uncertainty Experiment for Large Scale Measuring Equipment
- Vol. 45, Issue 5, Pages: 84-89(2011)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB92
- Online First：10 May 2011，
  
  Published：2011
- 稿件说明：
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Uncertainty Experiment for Large Scale Measuring Equipment[J]. 2011, 45(5): 84-89.
DOI：

Uncertainty Experiment for Large Scale Measuring Equipment[J]. 2011, 45(5): 84-89. DOI：

摘要

为了弥补传统组合式测量系统仅通过仪器的机械组合与测量数据的融合来扩大测量范围、从而提高测量精度的不足

通过分析典型近端与远端测量设备——七关节测量臂与激光跟踪仪的测量模型

提取影响测量不确定度的关键参数

进而基于静态单点重复测量实验

综合评定了各关键参数对测量不确定度分布规律的影响趋势.实验结果表明:测量臂腰部支撑关节1的精度(小于0.04 mm)明显高于其他关节

因此对终端测量不确定度的影响较小; 关节7对测量不确定度的影响最小(小于0.03 mm)

而其余各关节转角的增大对测量不确定度的影响均有增大的趋势

其中铰链关节的增幅明显大于转动关节

且越靠近基座端的关节转角变化对不确定度的影响越大; 激光跟踪仪水平、竖直方位角对不确定度的影响对称分布于90°两侧

且随测量极径的增大呈上升趋势.

Abstract

To make up the shortage of the traditional combined measurement which enlarge measurement range and improve accuracy only by mechanical combination and measured value fusion

the measurement model of the multi-joint measuring arm and the laser tracker are analyzed

and the key parameters affecting measurement uncertainty are extracted. Following the repeated measurements of static single point

the above key parameter influences on uncertainty distribution are evaluated synthetically. The experimental results show that the waist joint 1 exerts lesser influence on the terminal measurement uncertainty

less than 0.04 mm

because the stiffness and accuracy of the waist joint 1 are obviously higher than the other joints; joint 7 has the least influence on it

less than 0.03 mm

which meets the design aim for improving flexibility of measurement arm. The other joints have ascending influence on it

and the influence from the hinge joints gets greater than the rotational joints. The measurement uncertainty

which affected by the laser tracker horizontal and vertical azimuth

distributes symmetrically two sides of 90°.

关键词

Keywords

references

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