Cabin Noise from Boundary Layer Excitation

The CANOBLE project marks a key step towards quieter flights and greater passenger comfort, combining advanced technology and in-depth research to transform the flying experience.

This article presents an innovative study of cabin noise conducted as part of the CANOBLE project of the European Union’s CleanSky2 program. Using an advanced pressure sensor, the first part of the study measures fuselage excitation by the Turbulent Boundary Layer (TBL) and uses numerical simulations to predict cabin noise transmission. The second part analyzes the results of full-scale wind tunnel tests, validating the measurements and simulations. These data are crucial for improving noise reduction methods and optimizing the design of future aircraft.

This paper is focused on the study of the interior cabin noise of a commercial jet conducted within the frame of the CANOBLE project of the EU’s CleansSky2 program. From the development of key technologies to measure the Turbulent Wall Pressure Fluctuation excitation (TWPF) and to predict the interior noise by transmission through the fuselage, a test campaign has been conducted in the S2A wind tunnel to measure the aero-vibroacoustics transmission on a mock-up of the fore part of a Dassault Aviation business jet.

The paper will first present the technologies developed in the frame of the project with the introduction of a advanced pressure sensors to measure the wall pressure excitation and a numerical workflow to predict the interior noise. The second and third parts will be focused on the presentation of the full-scale wind tunnel test campaign and the analysis of the results. Various configurations will be discussed.

This research has been funded by the European Union through the CANOBLE Cleansky project (H2020- CS2-CFP02-2015-01, project id 717084).

Keywords: turbulent boundary layer, wall pressure, MEMs advanced sensor, wind tunnel test, vibro-acoustic modelling