A progress report is given on the implications of inlet noise reduction on aircraft direct operating costs (DOC). It considers treated inlet rings, various other inlet noise reduction concepts, and forward-speed effects. The report was limited to relatively well-established approaches to inlet noise reduction, such as acoustic liners and fixed-geometry/high-subsonic-speed inlets which are the focus of considerable current research activity. All of the concepts discussed are of a "passive" nature, i.e., no moving parts or electrical feedback systems.
Advanced inlet duct noise reduction concepts
01.01.1976
Aufsatz (Konferenz)
Keine Angabe
Englisch
Auxiliary power unit inlet duct assembly for mitigating noise
Europäisches Patentamt | 2017
|AUXILIARY POWER UNIT INLET DUCT ASSEMBLY FOR MITIGATING NOISE
Europäisches Patentamt | 2017
|