JPL NEURAL NETWORK WORKSHOP "A DECADE OF NEURAL NETWORKS"

Abstract

We have previously reported on the use neural networks for detection and identification of faults in complex microprocessor controlled powertrain systems [ 1,2]. The data analyzed in those studies consisted of the full spectrum of signals passing between the engine and the real-time microprocessor controller. The specific task of the classification system was to classify system operation as nominal or abnormal and to identify the fault present. The primary concern in earlier work was the identification of faults, in sensors or actuators in the powertrain system as it was exercised over its full operating range. The use of data from a variety of sources, each contributing some potentially useful information to the classification task, is commonly referred to as sensor fusion and typifies the type of problems successfully addressed using neural networks. In this work, we explore the application of neural networks to a different diagnostic problem, the diagnosis of faults in newly manufactured engines and the utility of neural networks for process control. While this problem shares a number of characteristics of the previous studies, there are several Significant differences.