Analysis of the PTA external noise data and comparison with predictions

Analyses of the Propfan Test Assessment external fuselage noise data and external boom data are presented. Data analysis was focused on an array of 45 microphones located on the external fuselage surface that are arranged into two line arrays, one around the fuselage at the plane of rotation, and the other along the fuselage side nearest to the propeller. A third group comprises a surface array of 39 microphones covering from top to bottom of the fuselage and from one diameter upstream to one diameter downstream of the plane of rotation. The data obtained from this surface array and the developed color contours of the noise intensity on the fuselage are presented. Also included are two flight test predictions and the comparison with measured data.