Print Email Facebook Twitter Improving propeller noise measurement and prediction by applying acoustic imaging Title Improving propeller noise measurement and prediction by applying acoustic imaging Author Smit, Hein-Dirk (TU Delft Aerospace Engineering) Contributor Snellen, M. (mentor) Degree granting institution Delft University of Technology Programme Aerospace Engineering Project Dutch Electric Aviation Center Date 2021-06-17 Abstract In recent years, there has been a rise of electric propeller aircraft in the field of general aviation. These propeller aircraft greatly reduce the emissions and engine noise compared to conventional aircraft, but noise coming from the propeller stays unchanged. Acoustic imaging, using beamforming, could help in the characterization of associated noise sources. In this research, the noise of a Cessna Skymaster 337F is recorded using a microphone array, and two beamforming algorithms are applied in the data analysis: conventional beamforming (CTDBF) and rotating beamforming (ROSI). The combination of these two algorithms adds a new dimension to acoustic analysis of propeller noise, namely a choice of reference frame, which allows the researcher to separate rotating noise sources from stationary noise sources. It has been shown that this is a very valuable tool for localizing the noise, making it easier to reduce the propeller noise in future research. Subject Propeller noiseBeamformingROSInoise measurementsCTDBFNoise prediction To reference this document use: http://resolver.tudelft.nl/uuid:de843fc3-1edc-4cab-b775-d9fc026718a5 Part of collection Student theses Document type master thesis Rights © 2021 Hein-Dirk Smit Files PDF FINAL_Master_Thesis_Repor ... k_Smit.pdf 6.07 MB Close viewer /islandora/object/uuid:de843fc3-1edc-4cab-b775-d9fc026718a5/datastream/OBJ/view