Online-expansion, online maintenance and fault tolerance are vital functions of rail signal monitoring system, which can guarantee the system always in working status and satisfy the sustainable development of rail transit. Due to the limitations of traditional centralized system structure, it is necessary to optimize the design of rail station signal monitoring system to make the system possess these functions. In this research, the novel concept of Role on Autonomous Decentralized System (RoADS) is adopted to optimize the design of rail signal monitoring system. On the one hand, RoADS has the characteristic of role dynamic conversion which is essential to realize the special function of online-expansion, online maintenance and fault tolerance. On the other hand, RoADS also can support the basic function of data collection. In order to verify the validity of the proposed method, a case study has been performed on ZPW-2000 track circuit monitoring system which is the subsystem of rail signal system mainly responsible to monitor the track circuit. The results clearly indicate that the optimized system based on RoADS can not only realize the function of data collection, but also possess the function of online-expansion, online maintenance and fault tolerance. Consequently, the proposed method based on RoADS can improve the safety level of rail transit and reduce the cost operation which is of great significance for maintaining the sustainable urban development of rail transit.

中文翻译：

---

基于角色自治分散系统的火车站信号监测系统优化设计

在线扩容、在线维护和容错是轨道信号监控系统的重要功能，可以保证系统始终处于工作状态，满足轨道交通的可持续发展。由于传统集中式系统结构的局限性，需要对火车站信号监控系统进行优化设计，使系统具备这些功能。在这项研究中，采用自主分散系统（RoADS）的新概念来优化铁路信号监控系统的设计。一方面，RoADS具有角色动态转换的特性，这对于实现在线扩展、在线维护和容错等特殊功能是必不可少的。另一方面，RoADS也可以支持数据采集的基本功能。为了验证所提方法的有效性，以ZPW-2000轨道线路监测系统为例，该系统是轨道信号系统中主要负责轨道线路监测的子系统。结果清楚地表明，基于RoADS的优化系统不仅可以实现数据采集功能，还具备在线扩展、在线维护和容错功能。因此，提出的基于RoADS的方法可以提高轨道交通的安全水平，降低运营成本，对于维护城市轨道交通的可持续发展具有重要意义。以ZPW-2000轨道电路监测系统为例进行了研究，该系统是轨道信号系统的子系统，主要负责轨道电路的监测。结果清楚地表明，基于RoADS的优化系统不仅可以实现数据采集功能，还具备在线扩展、在线维护和容错功能。因此，提出的基于RoADS的方法可以提高轨道交通的安全水平，降低运营成本，对于维护城市轨道交通的可持续发展具有重要意义。以ZPW-2000轨道电路监测系统为例进行了研究，该系统是轨道信号系统的子系统，主要负责轨道电路的监测。结果清楚地表明，基于RoADS的优化系统不仅可以实现数据采集功能，还具备在线扩展、在线维护和容错功能。因此，提出的基于RoADS的方法可以提高轨道交通的安全水平，降低运营成本，对于维护城市轨道交通的可持续发展具有重要意义。