Abstract
Gas path analysis is a useful aid in modelling for jet engines and gas turbines. The models are used to diagnose the condition of these machines. However, errors from the measuring sensors distort the true states of the equipment. The detection and compensation of sensor errors is thus an important task in the fild of diagnosis. In jet engines with several working points the problem is solved by a model-based procedure; powerful software packages already exist for this purpose. A knowledge-based procedure is requiredfor gas turbines with only one working point. To this end an expert system has been developed using a rule network which considers the uncertanties of the system
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