Health Monitoring for Aircraft Systems using Decision Trees and Genetic Evolution

• Reducing unscheduled maintenance is important for aircraft operators. There are significant costs if flights must be delayed or cancelled, for example, if spares are not available and have to be shipped across the world. This thesis describes three methods of aircraft health condition monitoring and prediction; one for system monitoring, one for forecasting and one combining the two other methods for a complete monitoring and prediction process. Together, the three methods allow organizations to forecast possible failures. The first two use decision trees for decision-making and genetic optimization to improve the performance of the decision trees and to reduce the need for human interaction. Decision trees have several advantages: the generated code is quickly and easily processed, it can be altered by human experts without much work, it is readable by humans, and it requires few resources for learning and evaluation. The readability and the ability to modify the results are especially important; special knowledge can be gained and errors produced by the automated code generation can be removed.A large number of data sets is needed for meaningful predictions. This thesis uses two data sources: first, data from existing aircraft sensors, and second, sound and vibration data from additionally installed sensors. It draws on methods from the field of big data and machine learning to analyse and prepare the data sets for the prediction process.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Tillförlitlighets- och kvalitetsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Reliability and Maintenance (hsv//eng)

Nyckelord

Condition Monitoring

Remaining Useful Life Prediction

Decision Tree

Genetic Algorithm

Fuzzy Decision Tree Evaluation

System Monitoring

Aircraft Health Monitoring

Feature Extraction

Feature Selection

Data Driven

Health Prognostic

Knowledge Based System

Supervised Learning

Data-Driven Predictive Health Monitoring

Health Indicators

Machine Learning

Big Data

Pattern Recognition

Drift och underhållsteknik

Operation and Maintenance

Publikations- och innehållstyp

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