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船体分段测量点数据与CAD模型自动匹配方法研究

DOI: 10.3969/j.issn.1006-7043. 201109020

Keywords: 船体分段测量, 主元分析(PCA), 欧拉旋转, 自动匹配, 粗匹配, 精匹配

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Abstract:

为了能准确分析船体分段的建造误差,给出合理的建造精度评价,船体分段测量点数据与CAD模型的精准匹配是关键.针对目前船厂通常采用全站仪进行测量,提出一种以全站仪测得的船体分段测量点集为处理对象,自动进行测量点数据与CAD模型匹配的算法.该算法分粗匹配与精匹配两部分,粗匹配采用主元分析(PCA)法来缩小测量点集与CAD模型点集间的错位,通过搜索最近点法来确定对应点对;精匹配以粗匹配的结果作为初始位置,采用欧拉旋转理论对测量点集进行旋转和平移调整使匹配结果最优.实例表明,该算法不需要明确测量点与CAD模型点的对应关系,能自动匹配二者,准确地评价船体分段建造精度,为后续装配提供依据.

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