Acoustic attenuation panel i.e. acoustic attenuation lining, for propulsion system of aircraft, has cellular structure whose one of characteristics varies acoustic wave to locally oppose acoustic wave to impedance variations

摘要

The panel i.e. acoustic attenuation lining (26), has a cellular structure (30) whose one of characteristics e.g. proportion of open surface, influences impedance of the panel. One of the characteristics varies acoustic wave along a propagation axis i.e. longitudinal axis, of a nacelle to locally oppose the wave to impedance variations due to the characteristics related to aerodynamic flow and the wave. The cellular structure is presented in the form of Nida Nomex(RTM: lightweight honeycomb fiber).