Constraints Evaluation and Working Methodology for Laser Scanning of Free-Form Surfaces

P. Fernández, B. Álvarez, J. C. Rico, David Blanco Fernandez, G. Valiño
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引用次数: 1

Abstract

This research presents a working methodology for developing an automatic planning system of the scanning process of free-form surfaces. The surface has been modelled using a STL format, that permits the automatic recognizing of any type of surface. This work does only consider collision-free orientations that guarantee the visibility of the zone to scan and that are compatible with the constraints imposed by the process parameters. In order to speed up the calculation of these orientations, different methods like back-face culling and space partitioning techniques, such as kd-trees, are applied. Once the space occupied by the part is partitioned in regions, recursive ray traversal algorithms are used in order to check for intersection exclusively the part triangles (STL) that can potentially be traversed by each laser beam direction
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自由曲面激光扫描的约束评估与工作方法
本研究提出了一种开发自由曲面扫描过程自动规划系统的工作方法。表面已使用STL格式建模,允许自动识别任何类型的表面。这项工作只考虑无碰撞的方向,保证扫描区域的可见性,并与工艺参数施加的约束相兼容。为了加快这些方向的计算速度,应用了不同的方法,如背脸淘汰和空间划分技术,如kd-trees。一旦零件占用的空间被划分为区域,递归射线遍历算法用于检查每个激光束方向可能遍历的零件三角形(STL)的相交
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