An Efficient Stochastic Qualitative Reasoning Method for Fault Diagnosis

Qualitative Reasoning in Electronic Fault Diagnosis

This paper describes some work in progress aimed at developing an expert system for fault diagnosis on switching mode power supplies. The system being developed is designed to interface with some existing automatic test equipment. Results of tests from this test equipment are the main input to the expert system. Another input is information about signals at various points in the circuit under t...

Combining Interval and Qualitative Reasoning for Fault Diagnosis

A methodology is proposed to diagnose faults from a detection system that allows to express uncertainty with intervals in parameters and measurements. A fault is detected by comparing current measurements with computed external and internal approximations of behavior. The results are applied to diagnose faults. A qualitative data set is obtained in order to create fault rules. A fault library i...

Planetary gearbox fault diagnosis using an adaptive stochastic resonance method

Planetary gearboxes are widely used in aerospace, automotive and heavy industry applications due to their large transmission ratio, strong load-bearing capacity and high transmission efficiency. The tough operation conditions of heavy duty and intensive impact load may cause gear tooth damage such as fatigue crack and teeth missed etc. The challenging issues in fault diagnosis of planetary gear...

Transformation of Quantitative Measurements into Qualitative Values in Stochastic Qualitative Reasoning for Fault Detection

Fault detection by stochastic qualitative reasoning is an effective way for complex systems such as air conditioning systems. In this framework, the faulty part of a system can be identified by comparing the behavior derived by stochastic qualitative reasoning with the actual measured behavior. The latter is represented as the series of qualitative values that are obtained by classifying quanti...

Qualitative Methods for Fault Diagnosis