系统级BIT的故障隔离策略

The Fault Isolation Strategy for System-Level BIT

为缩短系统级BIT的平均故障隔离时间,吸取直接熵法的基本思想,运用信息流模型和信息理论,提出系统级故障隔离的间接熵法,并讨论了工程中应用间接熵法时所需考虑的相关问题.实验验证和理论分析表明,该方法弥补了直接熵法构造故障隔离策略时需进行人工干预、计算复杂性高的不足;在不等故障概率的假设条件下,平均故障隔离时间比直接熵法减少约38％.

In order to shorten the mean fault isolation time (MFIT) of system-level BIT, an entropy-indirected algorithm for system-level fault isolation i;s developed based on the main idea of entropy-directed algorithm by using the information flow model and information theory. The related problems are also discussed in engineering application. The entropy-directed algorithm needs manual intervention to construct fault isolation strategy, and it is of a high computation complexity. Theoretical analysis and experimental results illustrate that the entropy-indirected algorithm remedies such deficiency. The MFIT of the strategy by this algorithm is about 38 % less than that by the entropy-directed algorithm under the assumption of unequal fault rate.