Contextual Normalization Applied to Aircraft Gas Turbine Engine Diagnosis

TL;DR

This paper explores a novel contextual normalization method combined with machine learning to improve fault diagnosis in aircraft gas turbine engines, demonstrating its effectiveness over traditional normalization techniques.

Contribution

It introduces a new contextual normalization strategy for machine learning in engine fault diagnosis, validated with real sensor data and compared with linear regression.

Findings

Instance-based learning outperforms linear regression.

Contextual normalization outperforms other normalization methods.

Algorithms can support technicians in sensor data interpretation.

Abstract

Diagnosing faults in aircraft gas turbine engines is a complex problem. It involves several tasks, including rapid and accurate interpretation of patterns in engine sensor data. We have investigated contextual normalization for the development of a software tool to help engine repair technicians with interpretation of sensor data. Contextual normalization is a new strategy for employing machine learning. It handles variation in data that is due to contextual factors, rather than the health of the engine. It does this by normalizing the data in a context-sensitive manner. This learning strategy was developed and tested using 242 observations of an aircraft gas turbine engine in a test cell, where each observation consists of roughly 12,000 numbers, gathered over a 12 second interval. There were eight classes of observations: seven deliberately implanted classes of faults and a healthy class. We compared two approaches to implementing our learning strategy: linear regression and instance-based learning. We have three main results. (1) For the given problem, instance-based learning works better than linear regression. (2) For this problem, contextual normalization works better than other common forms of normalization. (3) The algorithms described here can be the basis for a useful software tool for assisting technicians with the interpretation of sensor data.