Machining Error Evaluation of Free-Form Surface Based on Point Cloudy Data

doi:10.7652/xjtuxb201910019

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Machining Error Evaluation of Free-Form Surface Based on Point Cloudy Data

更新时间：2025-07-09

- Machining Error Evaluation of Free-Form Surface Based on Point Cloudy Data
- Vol. 53, Issue 10, Pages: 135-142(2019)
- 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：10.7652/xjtuxb201910019
  CLC： TQ320.66
- Online First：10 October 2019，
  
  Published：2019
- 稿件说明：
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Machining Error Evaluation of Free-Form Surface Based on Point Cloudy Data[J]. 2019, 53(10): 135-142.
DOI：

Machining Error Evaluation of Free-Form Surface Based on Point Cloudy Data[J]. 2019, 53(10): 135-142. DOI： 10.7652/xjtuxb201910019.

摘要

针对自由曲面加工误差检测困难的问题

提出了一种自由曲面加工误差评定方法。该方法以高精度蓝光扫描仪获取到的点云作为实测数据

以自由曲面的立体印刷模型作为理论模型。首先设置动态偏差阈值去除点云的远距离噪声

利用基于曲面变化度的局部离群系数方法去除点云的近距离噪声; 然后采用最近点迭代算法分离点云位置误差的旋转量

以自适应粒子群算法依据最小区域原则分离位置误差的平移量; 最后对点云进行基准变换后

计算点云与模型之间的偏差。实验结果表明

相对于最近点迭代算法

所提方法计算的位置误差向量均方根误差减小了66%

轮廓度减小了18%。提出方法的位置误差分离精度更高

轮廓度误差评定更准确

适用于扫描点云对自由曲面的加工误差评价

可以有效判断出超差区域。

Abstract

Aiming at the difficulty in detecting the machining error of free-form surface blade

a method for evaluating the machining error of free-form surfaces is proposed

where the point cloud is obtained by the high-precision blue-light scanner as the measured data

and the STL model of the free-form surface is taken as the theoretical one.The dynamic deviation threshold is set to remove the far outliers of point cloud

and the near outliers of the point cloud are removed with the SVLOF method.Then the iterative closest points algorithm is used to separate the rotation of the point cloud position error

and the adaptive particle swarm algorithm is used to separate the translation amount according to the minimum region principle.The deviation between the point cloud and the model is calculated after the reference transformation of the point cloud.The experimental results show that the root mean square error of the position error vector evaluated with the proposed method is reduced by 66% and

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