Reverse engineering of free-form surface based on the closed-loop theory.
Reverse engineering of free-form surface based on the closed-loop theory.
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基于闭环理论的自由曲面逆向工程
DOI：
10.1155/2015/903624
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发表时间：
2015
影响因子：
--
通讯作者：
Ji XG
中科院分区：
文献类型：
--
作者：
He XM;He JF;Wu MP;Zhang R;Ji XG
寻求更好的测量方法和更精确的模型重建一直是逆向工程领域研究者关注的焦点。在此基础上，提出了一种自由曲面自适应测量、实时重构和在线评价的新方法。预测点的坐标和矢量根据测量点拟合的Bézier曲线计算。最终测量的点云分布符合自由曲面的几何特征。采用非均匀B样条方法将点云拟合到曲面模型上，基于网格和曲面特征从曲面模型中提取检查点，利用三坐标测量机检查检查点在曲面上的位置并对模型进行评价，然后更新曲面模型以满足精度要求。集成测量、重构、评价，用闭环逆过程，建立了精确的模型。算例结果表明，测量点按曲率分布在整个曲面上，重建模型可以用微米级表示。同时，测量、重构和评价以闭环反求系统的形式集成在一起。
To seek better methods of measurement and more accurate model of reconstruction in the field of reverse engineering has been the focus of researchers. Based on this, a new method of adaptive measurement, real-time reconstruction, and online evaluation of free-form surface was presented in this paper. The coordinates and vectors of the prediction points are calculated according to a Bézier curve which is fitted by measured points. Final measured point cloud distribution is in agreement with the geometric characteristics of the free-form surfaces. Fitting the point cloud to a surface model by the nonuniform B-spline method, extracting some check points from the surface models based on grids and a feature on the surface, review the location of these check points on the surface with CMM and evaluate the model, and then update the surface model to meet the accuracy. Integrated measurement, reconstruction, and evaluation, with the closed-loop reverse process, established an accurate model. The results of example show that the measuring points are distributed over the surface according to curvature, and the reconstruction model can be completely expressed with micron level. Meanwhile, measurement, reconstruction and evaluation are integrated in forms of closed-loop reverse system.