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1 results about "Bond graph" patented technology
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A bond graph is a graphical representation of a physical dynamic system. It allows the conversion of the system into a state-space representation. It is similar to a block diagram or signal-flow graph, with the major difference that the arcs in bond graphs represent bi-directional exchange of physical energy, while those in block diagrams and signal-flow graphs represent uni-directional flow of information. Bond graphs are multi-energy domain (e.g. mechanical, electrical, hydraulic, etc.) and domain neutral. This means a bond graph can incorporate multiple domains seamlessly.
A semi-quantitative fault diagnosis system based on bond graph and expert system combination
The application discloses a semi-quantitative fault diagnosis system based on the combination of bond graph and expert system, which comprises the following steps: a data module is used for importing fault data into the system; a field graph module is used for drawing a nuclear power plant equipment and system graph; a reasoning machine module is used for designing a reasoning logic architecture, adaptively changing a quantitative bond graph model and designing the reasoning machine module through a qualitative bond graph method; and a threshold setting module is used for setting a parameter alarm threshold; if an input parameter deviates from the range, a corresponding reasoning event is triggered in the reasoning machine module, and a change trend and a diagnosis result of other parameters are obtained according to reasoning of the reasoning machine module. The application can also diagnose unknown faults through coefficient abnormalities, and can judge fault sizes through parameter abnormal ranges to realize semi-quantification. Compared with other methods, the application has higher adaptability and wider diagnosis range in the fault diagnosis of a nuclear power plant complex system, and a new expert system knowledge acquisition method is added.
Owner:HARBIN ENG UNIV