Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology

Nanning, China

Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology

Nanning, China
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Wu X.,Nanjing Normal University | Wu X.,Tech Data | Wu X.,Henan Normal University | Wang H.,Nanjing Normal University | And 11 more authors.
Advances in Intelligent Systems and Computing | Year: 2017

With the aim of resolving the issue of cluster analysis more precisely and validly, a new approach was proposed based on biogeography-based optimization (abbreviated as BBO) algorithm. (Method) First, we reformulated the problem with an optimization model based on the variance ratio criterion (VARAC). Then, BBO was presented to search the optimal solution of the VARAC. There are 400 data of four groups in the experimental dataset, which have the degrees of overlapping of three distinct scales. The first one is nonoverlapping, the second one is partial overlapping, and the last is severely overlapping. BBO algorithm was compared with three different state-of-the-art approaches. We ran every algorithm 20 times. In this experiment, our results demonstrate the maximum VARAC values that can be found by BBO. The conclusion is that BBO is predominant which is extremely quick for the issue of clustering analysis. © Springer Nature Singapore Pte Ltd. 2017.


Pan H.,Guangxi University | Pan H.,Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology | Gan L.,Guangxi University | Yu Z.,Guangxi University | And 2 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2017

A contour-parallel tool path generation method was proposed based on pair-wise offset to solve the problems of generating contour-parallel tool paths, which were composed of lines and arcs. The convex vertex and interfering concave vertex of closed contour were used as a start point respectively, and the local and global invalid areas of contour including lines and arcs were identified respectively with the method combining pair-wise-interference-detection(PWID) procedures and arc segmentation processing. Non-interference contour-parallel tool path was generated by offsetting the closed contour without invalid area. The proposed method was realized in the self-developed CAD/CAM software. The simulation results show that the tool path without interference area may be generated accurately and effectively with the proposed method, and may be applied to closed contours with islands as well. © 2017, China Mechanical Engineering Magazine Office. All right reserved.


Chen L.,Guangxi University | Chen L.,Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology | Cheng Z.,Guangxi University | Huang B.,Guangxi University | And 3 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2016

The mismatch of dual-axis servo gain parameters might bring negative impacts on the issues of synchronization in dual-drive system. To solve this problem, the relationship among tracking errors from single axis and the synchronization errors from dual-axis was investigated, by analysis of steady-state-error from single axis. Then the analytic formula of the synchronization errors was derived as reference position of ramp type applied. And then the quantitative relationship among the synchronization errors and parameters (the dual servo gain and feed rate) was built and determined. Furthermore, two novel compensation strategies for compensating synchronization errors were raised by introducing velocity factor into cross-coupling controller. Experimental and simulation results were given to verify the validity of the proposed scheme for obtaining synchronization errors. It can also be proved that both of two strategies can suppress synchronization errors effectively, which is caused by dual-axis servo gain mismatch. And the dynamic responses of single axis system is not affected after the proposed control strategies applied. By comparison of the two compensation strategies, smoother curve of synchronization errors may be obtained using the second compensation strategy. © 2016, China Mechanical Engineering Magazine Office. All right reserved.


Pan H.,Guangxi University | Pan H.,Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology | Dai J.,Guangxi University | Dai J.,Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology | And 8 more authors.
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2014

The existing collision detection algorithms for multi-robot are excessively time-consuming. To speed up the process, a parallel collision detection algorithm using dynamic bounding volume tree with a three-layer hierarchy was proposed. This new hierarchy consists of an upper dynamic removal layer, a middle link layer and a bottom layer. Firstly, the three-layer hierarchy was adopted to build a dynamic bounding volume tree between every two robots. Secondly, a parallel architecture was designed to compute each layer respectively and speed up the calculation in parallel. Lastly, parallel computing collision detection was implemented based on the three parallel structures using the OpenMP. Experiments performed on a 6/8 robots workstation and the analysis of time complexity show that under the same experimental conditions, when parallel computing the middle link layer and the bottom layer of the dynamic bounding volume tree, the efficiency of collision detection is about two times faster than that of the original data structure, and over four times faster than that of RAPID. The proposed parallel architecture fully takes advantage of the hierarchical structure of the dynamic bounding volume tree, and effectively improves the efficiency of collision detection among multi-robot. ©, 2014, Institute of Computing Technology. All right reserved.

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