Scholarlink

<p>To improve the accuracy and robustness of large-diameter pipeline butt-joint measurement under surface irregularities, local protrusions and section deformation, this paper proposes a butt-joint parameter measurement method based on dual laser ranging and robust ellipse fitting. During one complete pipe rotation, two laser ranging sensors synchronously acquire distance sequences from the pipe end surface, which are transformed into cross-sectional point clouds under a unified rotation-centre coordinate system. A six-sector random grouping and weighted percentile screening strategy is introduced to suppress outliers and non-uniform sampling interference. Then, algebraic ellipse fitting is used to provide the initial estimate, and an improved particle swarm optimisation algorithm based on orthogonal geometric distance is adopted to refine the ellipse parameters, including centre coordinates, major and minor semi-axes, and principal-axis angle. These parameters are further used for butt-joint deviation evaluation and compensation. Experiments show that the proposed method has good robustness under abnormal block disturbance. Its RMSE is 1.05&#xa0;mm, lower than those of the compared fitting methods. Repeated measurements on 600&#xa0;mm standard pipes show that the fitting RMSE remains within 0.06–0.10&#xa0;mm, the maximum centre deviation is 0.08&#xa0;mm, and the axis-length difference is no more than 0.09&#xa0;mm. For 600&#xa0;mm elliptical pipes, the maximum misalignment is reduced from 2.88&#xa0;mm to 0.81&#xa0;mm after compensation, satisfying the engineering requirement of less than 1&#xa0;mm. The method also provides a practical basis for simplified XY compensation when the one-sided ellipticity parameter is no greater than 1&#xa0;mm.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Research on the Butting Parameter Measurement Method of Large Diameter pipeline Based on Two-Laser Ranging

  • 期刊论文

  • 发表日期：

    2026年8月5日

查看全文
  • Xuecheng Luan,
  • Hanwen Yu,
  • Yanli Shu,
  • Mingxuan He,
  • Yandong Liu,
  • Fuxin Du,
  • Ying Zhang

摘要

To improve the accuracy and robustness of large-diameter pipeline butt-joint measurement under surface irregularities, local protrusions and section deformation, this paper proposes a butt-joint parameter measurement method based on dual laser ranging and robust ellipse fitting. During one complete pipe rotation, two laser ranging sensors synchronously acquire distance sequences from the pipe end surface, which are transformed into cross-sectional point clouds under a unified rotation-centre coordinate system. A six-sector random grouping and weighted percentile screening strategy is introduced to suppress outliers and non-uniform sampling interference. Then, algebraic ellipse fitting is used to provide the initial estimate, and an improved particle swarm optimisation algorithm based on orthogonal geometric distance is adopted to refine the ellipse parameters, including centre coordinates, major and minor semi-axes, and principal-axis angle. These parameters are further used for butt-joint deviation evaluation and compensation. Experiments show that the proposed method has good robustness under abnormal block disturbance. Its RMSE is 1.05 mm, lower than those of the compared fitting methods. Repeated measurements on 600 mm standard pipes show that the fitting RMSE remains within 0.06–0.10 mm, the maximum centre deviation is 0.08 mm, and the axis-length difference is no more than 0.09 mm. For 600 mm elliptical pipes, the maximum misalignment is reduced from 2.88 mm to 0.81 mm after compensation, satisfying the engineering requirement of less than 1 mm. The method also provides a practical basis for simplified XY compensation when the one-sided ellipticity parameter is no greater than 1 mm.