Health Monitoring of an Auxiliary Power Unit Using a Classification Tree
The objective of this work is to present a method to monitor the health of Auxiliary Power Units (APU) using a Dynamic Computational Model, Gas Path Analysis and Classification and Regression Trees (CART). The main data used to train the CART consists of measurements of the exhaust gas temperature, the bleed pressure and the fuel flow. The proposed method was tested using actual APU data collected from a prototype aircraft. The method succeeded in classifying several relevant fault conditions. The few misclassification errors were found to be due to the insufficiency of the information content of the measurement data. *
Thermodynamic Models for Pipeline Gas Turbine Diagnostics
Des modeles thermodynamiques destines a etre utilises comme outils de diagnostic pour les turbines a gaz soumis a une deterioration causee par l'encrassement du compresseur, un dommage du a un objet etranger, ou un dommage a la turbine. Des modeles relatifs a divers types de turbine a gaz couramment utilises ont ete soumis a essais et ont montre un bon accord avec l'experience des utilisateurs. Ces modeles sont tres souples et peuvent etre utilises soit pour des problemes specifiques, soit pour ameliorer la connaissance de certains problemes de fonctionnement
Development of a Low Cost Performance Monitoring System for Use on Board Naval Vessels
The availability of modern programmable calculators permits the development of low cost performance monitoring systems for onboard use on ships. Any system developed must be acceptable to normally qualified marine engineers, and a simple system using existing ship’s instrumentation to produce trend plots has been developed. Although extremely simple in concept, a diagnostic capability is provided; the level to which diagnosis can be carried out is dependent on the level of instrumentation provided. Tests have been carried out both on shore and at sea and the system shows great promise.Copyright © 1982 by ASME