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Gao T.,University of Chinese Academy of Sciences | Yu D.,CAS Shenyang Institute of Computing Technology | Yue D.,Anhui University of Science and Technology | Hu Y.,Shenyang Golding NC Technology Corporation
Proceedings of 2010 IEEE/ASME International Conference on Mechatronic and Embedded Systems and Applications, MESA 2010 | Year: 2010

In traditional CNC systems, dense software-hardware design and inappropriate data interactive mode can not balance the computational capability and communication load. In order to increase the interoperability level of communication platform in CNC and alleviate resource competition, a kind of network architecture was proposed in this research. A resource-consumption and low coupling module was separated to reduce the processor burden. Real-time Ethernet (RTnet) was used for communication between remote modules to decrease network delay. Linux Real Time mechanism (LXRT) was adopted to ensure real-time performance of modules in user space. A hybrid interactive model instead of shared memory was presented to improve data interaction between local modules. A prototype system was developed and three comparative experiments based on it were carried out. © 2010 IEEE. Source


Zhang X.,University of Chinese Academy of Sciences | Zhang X.,CAS Shenyang Institute of Computing Technology | Yu D.,CAS Shenyang Institute of Computing Technology | Hong H.,CAS Shenyang Institute of Computing Technology | And 2 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2011

In order to implement high speed and high surface quality machining of free-form surface, the smooth compression interpolation algorithm is proposed. Based on the angles and lengths evaluated from the adjacent command points, the machining path of free-form can be divided into two region types. For those regions composed of discontinuous micro-line blocks, the line interpolation is performed between the adjacent command points. For those regions composed of continuous micro-line blocks, firstly the shape-defining point is selected by the bend direction of the machining path; secondly the shape-defining points are fitted into smooth spline curve to compress blocks and smooth contours; lastly the curve interpolation is performed on the fitted smooth spline curve. The experimental results show that the proposed algorithm can improve machining efficiency and surface quality. © 2011 Journal of Mechanical Engineering. Source


Wang Z.,University of Chinese Academy of Sciences | Wang Z.,CAS Shenyang Institute of Computing Technology | Yu D.,CAS Shenyang Institute of Computing Technology | Zhang X.,CAS Shenyang Institute of Computing Technology | Zhang G.,Shenyang Golding NC Technology Corporation
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

Based on the analysis of NC system's communication net architecture and characteristics, a new time synchronization protocol was proposed. Using this protocol, mechanism of time synchronization was designed, which included communication model, communication timing, method of master schedule and slave real-time data exchange. The mechanism was successfully used into field-bus of NC system. The experimental results show its good synchronous precision. So it can meet the requirements of NC system's applications. Source


Li P.,University of Chinese Academy of Sciences | Ma Y.,CAS Shenyang Institute of Computing Technology | Yu D.,CAS Shenyang Institute of Computing Technology | Wang Z.,University of Chinese Academy of Sciences | And 2 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2011

Based on the study of contour error calculation methods detailed, a novel approach for estimating the contour errors in real-time was proposed for the requirements of real-time task in high-end CNC. This method solved the problems which, for free-form curve, the contour error calculation process is complex and needs large computations. Experimental results for a biaxial motion system show that the proposed approach has very small amount of computation and owns very high calculation accuracy in real-time tasks and it can guide the selection of the current control parameters and observe the control effects of the contour errors. Source


Wang Z.,University of Chinese Academy of Sciences | Wang Z.,CAS Shenyang Institute of Computing Technology | Yu D.,CAS Shenyang Institute of Computing Technology | Zhang X.,University of Chinese Academy of Sciences | And 3 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2011

Field-bus application is an inevitable development trend of numerical control (NC) system. In order to meet the NC system's high demand for reliable communication, based on the analysis of relationship between machining accuracy of NC system and reliable communication, a reliable communication mechanism of field-bus is designed. For this mechanism, an evaluation indicator for the communication reliability of NC system is established, and it is proposed that the fault-free communication time is used to measure the reliability of field-bus communication. Then by using the probability statistics method, mathematical analysis of the mechanism reliability is carried out, and the relation between the field-bus communication reliability and the number of communication stations and the maximum times of retransmissions is obtained, and their respective influence degree is analyzed. Simulation experiments verify the correctness of the theoretical analysis results, and the effectiveness of reliable communication mechanism applied to NC system is proved through the actual electromagnetic interference testing. The theoretical study and experimental result have important guiding role in reliability design and analysis of NC system communication. ©2011 Journal of Mechanical Engineering. Source

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