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激光雷达复材型面测量精度分析方法

潘鑫 张俐 何凯

潘鑫, 张俐, 何凯等 . 激光雷达复材型面测量精度分析方法[J]. 北京航空航天大学学报, 2020, 46(7): 1398-1404. doi: 10.13700/j.bh.1001-5965.2019.0441
引用本文: 潘鑫, 张俐, 何凯等 . 激光雷达复材型面测量精度分析方法[J]. 北京航空航天大学学报, 2020, 46(7): 1398-1404. doi: 10.13700/j.bh.1001-5965.2019.0441
PAN Xin, ZHANG Li, HE Kaiet al. Method of accuracy analysis for composite material surface measurement by lidar[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(7): 1398-1404. doi: 10.13700/j.bh.1001-5965.2019.0441(in Chinese)
Citation: PAN Xin, ZHANG Li, HE Kaiet al. Method of accuracy analysis for composite material surface measurement by lidar[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(7): 1398-1404. doi: 10.13700/j.bh.1001-5965.2019.0441(in Chinese)

激光雷达复材型面测量精度分析方法

doi: 10.13700/j.bh.1001-5965.2019.0441
基金项目: 

联合基金 6141B05090201

详细信息
    作者简介:

    潘鑫  男, 硕士研究生。主要研究方向:飞机数字化装配检测技术

    张俐  女, 高级工程师, 硕士生导师。主要研究方向:复杂产品数字化测量应用技术与工艺方法

    通讯作者:

    张俐, E-mail: gracejune@buaa.edu.cn

  • 中图分类号: V262.3+6;TB553

Method of accuracy analysis for composite material surface measurement by lidar

Funds: 

United Fund 6141B05090201

More Information
  • 摘要:

    针对激光雷达复材型面测量时测量精度的评定需求,提出了一种基于激光雷达回波信号信噪比(SNR)的精度分析方法。通过对复材型面检测结果进行评价,获取零件脱模后准确的变形量结果,有利于实现精准修模。所提方法考虑了测量工程中待测距离、入射角、材料属性等因素对测量结果产生的影响,研究激光雷达型面测量过程中回波信号信噪比与测量精度的联系,利用信噪比的变化规律,结合仪器不确定度,确定测量点云不同区域的精度修正因子,实现激光雷达大尺寸复材型面变形量检测结果的测量精度分析,减小了测量误差对变形量的影响。所提方法能准确评价测量结果的精度,获取复材型面的真实变形量。

     

  • 图 1  激光雷达测距原理

    Figure 1.  Principle of lidar ranging

    图 2  激光雷达信噪比监视窗口

    Figure 2.  Lidar's SNR monitoring window

    图 3  精度分析流程图

    Figure 3.  Flowchart of accuracy analysis

    图 4  测量时激光雷达的站位与光路示意图

    Figure 4.  Schematic diagram of position and optical path of lidar during measurement

    图 5  2种状态κ随入射角θ变化网格图

    Figure 5.  Grid diagram of κ as a function of incident angle θ in two states

    图 6  测量结果点云依修正因子κ分区

    Figure 6.  Partition of measurement result point-cloudaccording to correction factor κ

    图 7  工具球测量信号强度随待测距离变化曲线

    Figure 7.  Variation of measurement signal strength of tooling ball with measurement distance

    图 8  不同表面处理目标测量信号强度随待测距离变化曲线

    Figure 8.  Variation of measurement signal strength of target withdifferent types of surface treatment with measurement distance

    图 9  不同材料目标测量信号强度随待测距离变化曲线

    Figure 9.  Variation of measurement signal strength of different materials of target with measurement distance

    图 10  复材实测过程中信噪比波动曲线

    Figure 10.  SNR fluctuation curve during composite material measurement process

    图 11  测量结果点云与精度分区

    Figure 11.  Point-cloud and precision partition of measurement results

    表  1  仪器不确定度与信噪比数值对应关系

    Table  1.   Correspondence between instrument uncertainty and SNR

    待测距离/m 仪器不确定度/μm 信噪比/dB
    2 24 56.5
    4 43 47.8
    6 61 43.1
    8 82 38.7
    10 102 35.9
    下载: 导出CSV

    表  2  精度修正因子与实测不确定度对应关系

    Table  2.   Correspondence between accuracy correction factor and measured uncertainty

    测量分区 精度修正因子κ 实测不确定度/μm
    A 0.84 28.4
    B 0.77 55.4
    C 0.74 81.6
    D 0.71 112.1
    E 0.68 148.1
    下载: 导出CSV

    表  3  精度修正前后各区域平均变形量结果

    Table  3.   Average deformation results of each area before and after accuracy correction

    测量分区 修正前变形量/mm 修正后变形量/mm
    A 1.83 1.80
    B 2.31 2.25
    C 1.72 1.64
    D 1.57 1.46
    E 2.03 1.88
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-08-16
  • 录用日期:  2020-01-17
  • 刊出日期:  2020-07-20

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