双机热备计算机联锁控制系统的安全性和可用性分析

从现场的实际情况出发 ,笔者研究了双机热备计算机联锁控制系统的安全度和可用度指标。对实际应用中双机热备计算机联锁控制系统的失效情况进行了分析 ,其结果表明双机热备计算机联锁控制系统出现直接导致系统完全失效的故障概率很小 ,因此 ,引入了系统的故障可用系数 ,并研讨了故障可用系数对系统的可靠度、安全度和可用度的影响。通过双机热备计算机联锁控制系统的安全度和可用度的分析和仿真计算结果表明 ,引入故障可用系数后系统的安全性不变 ,系统的可靠度和可用度有显著提高。

Study of Security and Usability of the Dual Module Hot Spare Computer Interlocking Control System

Based on the on-site practical situation, security index and usability index of the dual module hot spare (DMHS) computer interlocking control system are studied. The low system invalidation probability, caused by system failure directly, is demonstrated by analyzing the DMHS computer interlocking control system invalidation. Therefore, failure-usability coefficient is introduced, and the effects of the failure-usability coefficient on the reliability, security, and usability of the system are analyzed. Simulation results show the unchanged security and the remarkable improvement of reliability and usability.