Innovative noise control in ducts

© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. This paper explores approaches to reduce the noise produced and propagated in the Environmental Control System (ECS) of aircraft. The work has been done as part of a FP7 EU-project “Integrated Design of Optimal Ventilation Systems for Low Cabin and Ramp Noise” (IDEALVENT). A strong constraint that is taken into account concerns the overall efficiency and reliability of the control. Passive strategies, which do not inject additional energy into the system, are adopted for the sake of safety and energy consumption. The mitigation operates on two fronts: flow and acoustic control, using turbulence grids to dampen out the inflow inhomogeneity and turbulence, and micro-perforates for acoustic absorption. In this paper the focus is on describing the novel results obtained by the use of so called micro-perforated plates (MPP’s) for in-duct noise control.

ISBN:9781624105043

Jaar van publicatie:2017