In reverse engineering measuring,the part whose appearance is complex or whose dimension is very large is often encountered.Because of the restriction of metrical device,the data measure in different coordinate system...In reverse engineering measuring,the part whose appearance is complex or whose dimension is very large is often encountered.Because of the restriction of metrical device,the data measure in different coordinate systems is often needed,then the reposition of the data measured must be solved.The optimum method of multi-target and multi-parameter is put forward in this paper.Its reposition precision is greatly advanced with regarding other traditional algorithms.The fundamental of this research is that rough reposition of the data measured is done firstly,which is equal to looking for the solvable range of optimum method,then the data measured are accurately repositioned with the method of multi-target and multi-parameter,which is equal to looking for the optimum solution of optimum method.展开更多
Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simp...Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.展开更多
Feature recognition and surface reconstruction from point clouds are difficulties in reverse engineering. A new surface reconstruction algorithm for slicing point cloud was presented. The contours of slice were extrac...Feature recognition and surface reconstruction from point clouds are difficulties in reverse engineering. A new surface reconstruction algorithm for slicing point cloud was presented. The contours of slice were extracted. Then, the intersection of two adjacent curve segments in the contour was obtained and curves feature was extracted. Finally, adjacent section contours were matched directly with Fourier-Mellin curve matching method for feature extraction. An example of 3-D model reconstruction shows the reliability and application of the algorithm.展开更多
文摘In reverse engineering measuring,the part whose appearance is complex or whose dimension is very large is often encountered.Because of the restriction of metrical device,the data measure in different coordinate systems is often needed,then the reposition of the data measured must be solved.The optimum method of multi-target and multi-parameter is put forward in this paper.Its reposition precision is greatly advanced with regarding other traditional algorithms.The fundamental of this research is that rough reposition of the data measured is done firstly,which is equal to looking for the solvable range of optimum method,then the data measured are accurately repositioned with the method of multi-target and multi-parameter,which is equal to looking for the optimum solution of optimum method.
基金This project is supported by National Hi-tech Research and Development Program of China (863 Program, No. 2006AA04Z114)Research Fund for the Doctoral Program of Higher Education, China (No. 20040335060)Provincial Scientific Personnel Educational Foundation of Zhejiang, China (No. R603240).
文摘Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.
基金Supported by the Foundation of Department of Science and Technology of Jiangxi Province and the Multidiscipline Foundation of Nanchang University
文摘Feature recognition and surface reconstruction from point clouds are difficulties in reverse engineering. A new surface reconstruction algorithm for slicing point cloud was presented. The contours of slice were extracted. Then, the intersection of two adjacent curve segments in the contour was obtained and curves feature was extracted. Finally, adjacent section contours were matched directly with Fourier-Mellin curve matching method for feature extraction. An example of 3-D model reconstruction shows the reliability and application of the algorithm.
基金The National Natural Science Foundation of China(Nos.51105332,51275465)the Science and Technology Plan of Zhejiang Province(No.2014C31096)the Key Program of Zhejiang Provincial Natural Science Foundation of China(No.LZ16E050001)
