| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 94 === This thesis uses ATOS to establish a computer-aided positioning system for optical scanning of 3D objects with free-form surfaces. Based on the 3D CAD model of the object, the system is capable of calculating proper orientations for surface scanning. In conjunction with the use of a 5-axis positioning table, the object can be moved and placed in appropriate positions and orientations so that the point cloud data of the object can be completely scanned using ATOS without any interference. On the other hand, this thesis developed a computerized system which simulates the movement of the positioning table and the object during scanning so that the user can ensure the scanning procedure before real scanning practice.
Pro/Toolkit is used in this research to implement the proposed system. It analyzes the surface geometry of the object to be scanned and find the rotational angles for various orientations to scan the whole surface of the object. Through a number of practical scanning practices, it is found that the number of changing the orientations of the object during scanning can be reduced if compared with the manual operation of scanning. It implies the raise of the scanning efficiency. Beside the practice of scanning, the resultant data points are further analyzed using Pro/VERIFY to compare the obtained data with the original CAD model of the object. It helps verify the applicability of the proposed method and the developed system in real scanning practice.
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