High-precision time synchronization in real-time Ethernet-based CNC systems

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机构：

[1] Xu, Xiong

[2] Xiong, Zhenhua

[3] Wu, Jianhua

[4] Zhu, Xiangyang

来源：

Zhu, Xiangyang (xiaoxu85@sjtu.edu.cn) | 1600年 / Springer London卷 / 65期

关键词：

This paper presents a time synchronization method to achieve high-precision distributed clocks in real-time Ethernet-based computer numerical control (CNC) systems with a ring topology. The proposed synchronization method adopts the frequency compensation and peer-to-peer transparent clock mechanisms; and utilizes a real-time synchronization protocol to embed the time synchronization into the real-time communication cycle. An optimal proportional-integral controller is then designed for the frequency compensation mechanism based on the model and analysis of the time synchronization process. Besides; the hardware implementation of this time synchronization strategy is described. Finally; a real time Ethernet-based CNC system with a ring topology is built; and experiments are conducted to verify the performance of the presented synchronization scheme. The experimental results demonstrate that the proposed time synchronization method achieves high synchronization precision. The peak-to-peak jitters are measured to be only 42.42 and 95.5 ns for one and four hops; respectively. © Springer-Verlag London Limited 2012;

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页码：5 / 8

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