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首页> 外文期刊>Chinese Journal of Mechanical Engineering >CAD-directed inspection planning for freeform surface using contact probes
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CAD-directed inspection planning for freeform surface using contact probes

机译：CAD设计的接触式自由曲面检测计划

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摘要

A methodology for CAD-directed measurement of freeform surface using a coordinate measuring machine equipped with a touch-trigger probe is presented, mainly including adaptive sampling of measurement points and registration of freeform surface. The proposed sampling method follows four steps: Freeform surface is fitted by bi-cubic B-spline; Curvedness measure of the surface is computed; Given a number of sampling points, an iterative algorithm is constructed for selecting a set of measurement points by employing the curvedness information; The measurement points is regularized for tradeoff between maximizing the measurement accuracy and minimizing the sampling time and cost. The aforesaid algorithm is demonstrated in term of a marine propeller blade. An offset surface registration method is presented to improve alignment accuracy of freeform objects, and Monte Carlo simulation is conducted to verify the effectiveness of the method.
机译：提出了一种使用配有触摸触发探针的坐标测量机进行CAD定向测量自由曲面的方法，主要包括对测量点的自适应采样和自由曲面的配准。拟议的采样方法分四个步骤：用双三次B样条拟合自由曲面；计算表面的弯曲度；给定多个采样点，构造一种迭代算法，以利用弯曲度信息选择一组测量点。为了最大化测量精度与最小化采样时间和成本之间的折衷，对测量点进行了规范化。以船用螺旋桨叶片为例说明了上述算法。提出了一种偏移曲面配准方法，以提高自由形状物体的对准精度，并进行了蒙特卡洛仿真，验证了该方法的有效性。

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