三维激光扫描技术在船舶排水量计量中的应用

Application of Three-Dimensional Laser Scanning Technology in Measurement of Ship Displacement

针对传统排水量计量方法工作强度大、效率低等缺点,依托近年来迅速发展的三维激光扫描技术,提出了一种基于点云切片技术的排水量计量方法。该方法将船舶点云沿着z轴分割成若干切片点云,利用三角形面积法计算切片上下横截面面积,最终计算出每个切片的体积并累加获得船舶排水量。此外,通过建立船舶的三维模型,利用软件获得对应高度的排水量,并以此作为参考值与该方法的结果进行对比,最后计算计量结果的相对扩展不确定度。经实验验证,该方法能够以较高的精度获取船舶排水量,为船舶排水量的计量提供了一种全新的技术手段。

Traditional methods of calculating displacement often have certain shortcomings and drawbacks such as high labor intensity and low efficiency. With the help of the 3D laser scanning technique, this paper introduces a displacement computation method based on point cloud slicing technique. The proposed method first segments the point cloud into several point cloud slices along z-axis. The triangle-area-integration method is adopted to calculate the cross-sectional area of each slice. The displacement can be calculated through the accumulation of each slice volume. To compare the results of the proposed methods, the displacement results of corresponding heights computed by commercial software are taken as a reference. Then we calculate the relative expanding uncertainty of the measurement results. The test results indicate that the proposed method can calculate the displacement with high accuracy, thus providing the displacement calculation with a new approach.