This thesis is devoted to examining the problems of engine detection in sailplanes. The purpose of this thesis is to develop a program capable of differentiating flights and parts of flights with the use of an engine from ones without an engine based on an acoustic analysis of noise inside a sailplane cabin during flight. The practical part of this thesis covers recording of noise inside the cabin of a sailplane during flight with and without the use of an engine in different conditions. These conditions include flying at different speeds, coordinated and uncoordinated flight, flying with an open and closed window and with and without landing gear deployed, as well as flying with the engine at different RPM settings. The practical part of this thesis also includes recording of engine noise on the ground, when no flight-induced aerodynamic noise is present. The development part of this research is based on acoustic analysis, calculation of acoustic and psychoacoustic features and classification of noise based on features of two different flight regimes.
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