Study On Key Technologies Of Reverse Engineering For Complex Object

Reverse Engineering(RE) is becoming an effective and efficient tool in supporting the rapid development and innovative design of product. In order to extend the application of RE technology, some key issues influencing the precision and efficiency of product in RE for complex objects were researched in this paper. And a high efficient Collaborative Integrated RE System(CIRES) was studied and developed.Noisy points need to be distinguished and extracted from the large scale of "point clouds", which are inevitable in the process of surface data acquisition in RE. By evaluating the smoothness of the cubic interpolation B-spline curve which is built up based on the data points in every measurement plane, noisy points can be distinguished. Some noisy points which are useful in improving the smoothness of spline after their being manipulated are called "useful noisy points" and regarded as data points for subsequent processes. The others called real noisy points are eliminated from the point clouds. By using this new method to manipulate the noisy points, reconstructed surfaces are more like the actual ones without local distortion.The critical question in solving the probe radius compensation is the precise calculation of the center-point's normal vector of the surface decided by the probe track. A concept of moment of inertia is introduced and the relative method is put forward, which can be used in the automatic compensation of probe radius. It is proved that the result obtained with the moment of inertia method is more accurate than that of the universal "average vectors method" in complex surface RE.Considering synthetically the characteristics of both segmentation technology...