WAVELET-BASED ANALYSIS FOR FOULING DIAGNOSIS OF AN AIRCRAFT HEAT EXCHANGER

摘要

A method and apparatus for estimating a fouling state of a heat exchanger of an aircraft. Training sensor measurements are obtained of a parameter related to operation of the heat exchanger and a wavelet transform is applied to the training sensor measurements to obtain wavelet data. Data reduction is performed on the wavelet data to obtain representative features indicative of the training sensor measurements. A classifier is then trained to assign suitable fouling classes to the representative features. The trained classifier is used on testing sensor measurements from the heat exchanger to assign a fouling class to the testing sensor measurements in order to estimate the fouling state of the heat exchanger.

主权项

1. A method of estimating a fouling state of a heat exchanger of an aircraft, comprising:
obtaining training sensor measurements of a parameter related to operation of the heat exchanger; applying a wavelet transform to the training sensor measurements to obtain wavelet data; performing data reduction on the wavelet data to obtain a representative feature indicative of the training sensor measurements; training a classifier to assign a suitable fouling class to the representative feature; and applying the trained classifier to testing sensor measurements from the heat exchanger to assign a fouling class to the testing sensor measurements in order to estimate the fouling state of the heat exchanger.