• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (2): 1-8.doi: 10.3901/JME.2020.02.001

• 仪器科学与技术 •    下一篇

基于叶片截面线CMM测量数据的ICP配准改进算法

蔺小军1, 吴刚1, 单秀峰1, 张允1, 崔彤1, 胡良毅2, 余杰2   

  1. 1. 西北工业大学航空发动机高性能制造实验室 西安 710072;
    2. 中国航发西安航空发动机有限公司 西安 710021
  • 收稿日期:2019-01-01 修回日期:2019-10-01 出版日期:2020-01-20 发布日期:2020-03-11
  • 通讯作者: 蔺小军(通信作者),男,1968年出生,博士,高级工程师。主要研究方向为精密测量、逆向造型、CAD/CAM。E-mail:linxj@nwpu.edu.cn
  • 作者简介:吴刚,男,1994年出生。主要研究方向为CAD/CAM。E-mail:wugang@mail.nwpu.edu.cn
  • 基金资助:
    国家科技重大专项资助项目(2015ZX04001003)。

An Improved ICP Registration Algorithm Based on CMM Measurement Data of Blade Section Line

LIN Xiaojun1, WU Gang1, SHAN Xiufeng1, ZHANG Yun1, CUI Tong1, HU Liangyi2, YU Jie2   

  1. 1. Laboratory of Aero-engine High Performance Manufacturing, Northwestern Polytechnical University, Xi'an 710072;
    2. AECC Xi'an Aero-engine Ltd., Xi'an 710021
  • Received:2019-01-01 Revised:2019-10-01 Online:2020-01-20 Published:2020-03-11

摘要: 快速、准确地对叶片进行测量是保证加工质量的关键。叶片三坐标测量机测量数据与理论数据之间的配准是数据处理的重要一步。针对传统迭代最近点(Iterative closest point,ICP)配准算法存在的配准精度低,提出一种基于叶片截面线三坐标测量机(Coordinate measuring machine,CMM)测量数据的ICP配准改进算法,将测量点到理论曲线的最小距离作为目标函数进行最近点的求解。首先,计算每一个测量点在理论点集中对应最近点,然后采用三次样条对该最近点及其附近理论点进行样条插值,最后计算测量点距离样条曲线最近点,并将此点作为求得的最近点。该方法在求得一个测量点在理论点集中对应最近点位置的同时,可顺次得到其他测量点在理论点集中的对应最近点,避免全遍历搜索计算。通过实例验证和对比,表明算法有效,精度较高。

关键词: 叶片, 三坐标测量机, ICP配准, 搜索最近点

Abstract: Rapid and accurate detection of blades is the key to ensure the machining quality. The registration between the coordinate measuring machine (CMM) measurement data and the theoretical model data is an important step. Aiming at the low registration accuracy of the traditional iterative closest point (ICP) registration algorithm, an improved ICP registration algorithm based on the CMM measurement data of the blade section line is proposed. The minimum distance between the measurement point and the theoretical curve is taken as the objective function to obtain the nearest point. First, calculating the corresponding nearest points of each measurement points in the theoretical sets, then the cubic spline is used to interpolate the nearest point and its nearby theoretical points, finally the nearest point of spline is obtained to measurement points and this point is taken as the nearest point; In this method, when the corresponding nearest point of measurement point in theoretical sets is obtained, we can get the corresponding closest points of other measuring points in theoretical sets at the same time and avoid all traversal search calculation. Validated and compared by some examples, it shows that the improved algorithm is effective and the precision is high.

Key words: blade, coordinate measuring machine, ICP registration, search closest point

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