现场条件约束下的动态诊断策略研究

Research on dynamic fault diagnosis strategy under condition constraints

摘要:

针对传统的故障诊断策略属于静态的诊断方法，难以在复杂的现场工作环境中应用的问题，在基于准深度优先搜索（QDFS）算法的基础上，提出了一种基于改进的QDFS算法（考虑测试的不确定性）的现场约束条件下的诊断策略生成方法。首先分析工作现场可能存在的条件约束，然后给出条件约束的描述方法，再根据改进的QDFS算法给出生成诊断策略的具体过程，最后用案例对方法进行验证。案例验证结果表明，该方法不仅考虑了不可靠测试的影响，并能在现场约束条件下应用起来，比传统的静态诊断策略更具有适应性和实用性。

Abstract:

The traditional fault diagnosis strategy is a method to generate the static diagnosis, which is difficult to be applied in the complex system and operating ambient. Based on the Quasi Depth First Search (QDFS) algorithm, this paper proposes a method of generating the diagnosis strategy under the condition constraints based on the improved QDFS algorithm (considering the uncertainty of the test). Firstly, the paper analyzes the possible condition constraints in the operating ambient, then gives the description method of the condition constraints, then according to the improved QDFS algorithm, gives the dynamic process of generating the diagnosis strategy. Finally a case is used to verify the effectiveness of the proposed method. The result shows that this method not only considers the influence of unreliable test, but also can be applied under the condition constraints of operating ambient. It is more adaptive and practical than the traditional static diagnosis strategy.