Distributed fault diagnosis method for circuit system

Abstract

The invention discloses a distributed fault diagnosis method for a circuit system. The distributed fault diagnosis method comprises: modeling is carried out on a circuit system and causal relationships between various parameters are configured to obtain a global diagnostic bond graph model of the circuit system; a minimum sub system based on each sensor is extracted from the circuit system by using all sensors in the circuit system as basic units and measuring values of sensors as local outputs of the circuit system to obtain local diagnostic bond graph models of all minimum sub systems respectively; according to the local diagnostic bond graph models of the minimum sub systems, a distributed analytical redundancy relationship is obtained, and the distributed analytical redundancy relationship is analyzed to obtain a distributed fault feature matrix; and on the basis of the distributed fault feature matrix, fault diagnosis is carried out. According to the invention, under the conditions of single fault and multiple faults, the performance of fault isolation is improved effectively; the complexity of subsequent fault component identification is reduced; and the diagnostic speed anddiagnostic accuracy of the fault are enhanced.

Description

technical field [0001] The invention relates to the field of fault diagnosis of circuit systems, in particular to a distributed fault diagnosis method of circuit systems. Background technique [0002] In modern industrial production, many complex electrical and mechanical circuit systems have been produced, such as complex integrated circuit systems, electromechanical circuit systems, and hydraulic circuit systems. In order to improve the safety and reliability of the circuit system, fault diagnosis and The importance of real-time monitoring has also become increasingly prominent. [0003] As the complexity of the circuit system increases, the difficulty of fault diagnosis of the circuit system also increases. The common fault diagnosis method is to model the circuit system based on the bonding graph, and obtain the global diagnostic bonding graph model of the circuit system. According to the circuit The system global diagnosis bond graph model directly obtains the global f...

AI Technical Summary

Problems solved by technology

However, this global fault diagnosis method will have the following main problems as the complexity of the circuit system increases: 1. Under single fault conditions, because some components in the circuit system have the same fault characteristics, fault isolation cannot be achieved; 2. Under the condition of multiple faults, because the fault characteristics of some components in the circuit system will cancel or cover each other, fault isolation cannot be achieved

At the same time, the performance of fault isolation will affect the complexity of subsequent fault component identification. The more components the possible fault set obtained from fault isolation contains, the higher the complexity of fault component identification and the lower the identification accuracy.

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