This paper describes the progress of an ongoing project with the ultimate goal to develop a method for acoustic indoor tests of aircraft engines. Measurements with a turbofan aircraft engine in the indoor test-stand of Lufthansa Technik are described. A linear microphone array has been set up using a special arrangement that has been patented by DLR that minimises the effect of reflected sound waves. It is demonstrated that with a beamforming algorithm that uses a small, 'sliding' sub-array, it is possible to measure differences between the sound fields of different engine modifications.
Beamforming on a turbofan engine in an indoor test-facility
Strahlformung bei einem Flugzeugbläsertriebwerk in einen Innenraumprüfanlage
2008
11 Seiten, 13 Bilder, 13 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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