Abstract
Sequential fault diagnosis is an approach that realizes fault isolation by executing the optimal test step by step. The strategy used, i.e., the sequential diagnostic strategy, has great influence on diagnostic accuracy and cost. Optimal sequential diagnostic strategy generation is an important step in the process of diagnosis system construction, which has been studied extensively in the literature. However, previous algorithms either are designed for single mode systems or do not consider test placement cost. They are not suitable to solve the sequential diagnostic strategy generation problem considering test placement cost for multimode systems. Therefore, this problem is studied in this paper. A formulation is presented. Two algorithms are proposed, one of which is realized by system transformation and the other is newly designed. Extensive simulations are carried out to test the effectiveness of the algorithms. A real-world system is also presented. All the results show that both of them have the ability to solve the diagnostic strategy generation problem, and they have different characteristics.
Highlights
Diagnostic strategy generation is one of the important contents of diagnosis system design
In order to solve the problem in real-world systems where unreliable tests and multiple faults may exist, heuristic functions have been developed by different researchers [4,5,6]
If we encounter a power supply problem in this spacecraft, different suspect failure sources will be obtained in the two operation modes which contain either solar panels or batteries. This means that the D-matrix is different in this kind of multimode systems and will undoubtedly affect the diagnostic strategy
Summary
Diagnostic strategy generation is one of the important contents of diagnosis system design. In order to solve the problem in real-world systems where unreliable tests and multiple faults may exist, heuristic functions (information gain heuristic, rollout strategy, etc.) have been developed by different researchers [4,5,6]. These methods achieve good effect in generating of optimal diagnostic strategy. If we encounter a power supply problem in this spacecraft, different suspect failure sources will be obtained in the two operation modes which contain either solar panels or batteries This means that the D-matrix (diagnostic dictionary matrix) is different in this kind of multimode systems and will undoubtedly affect the diagnostic strategy.
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