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Aiming at overcoming the disadvantages, such as high computational complexity, difficulty of modeling and error of diagnosis, which are existed in the current fault diagnosis methods, this paper analyzes the relationship between the faults and symptoms, establishes a fault diagnosis model based on weighed directed bipartite graph in this paper. According to the statistical probability, this paper...
A hierarchical built-in test equipment of circuit system based on boundary scan, which consists of subsystem-level BITE, board-level BITE and component-level BITE, is presented. Structure and working principle of each level BITE is introduced in detail, after giving the hierarchical structure. Experiment is also carried out to verify the design. The system could combine the strong information obtaining...
Based on multi-signal model, a novel diagnostic Bayesian networks auto-construction method is proposed in this paper. Combined with information entropy theory, a diagnostic strategy with the ability of sequential fault diagnosis, multi-fault diagnosis and coupling faults diagnosis is designed. In order to deal with uncertain problems and increase diagnostic accuracy, the self adjustment method of...
Fault information of machinery equipments is often contained in the process of lubricating oil wearing off. Meanwhile, the dielectric constant of the oil would change accordingly during the process. The principle of online oil contamination monitoring based on dielectric constant measurement is proposed. The measure system is also developed, which includes capacitance sensor, small capacitance detecting...
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