22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-P8.1

INVESTIGATION OF THE HELICOPTER NOISE

J. Bera, L. Pokoradi, R. Szabolcsi
Miklós Zrínyi National Defense University, Hungary

Keywords: helicopter, noise, protection

In Hungary about 40% of people live in regions where environmental noise is more than desirable one. Nevertheless the last 15 years the significant improvement of noise protection has not been. The designers and operators of the aircraft have experienced unsolved problem of aircraft-noise that is one of challenges of next century’s aviation. To adapt results of the noiseprotection investigation, the recognition of noise-sources and resulting influences of factors cause sound-field’s deviation is very important one. Therefore, in addition to measuring of noise level and frequencies, the factor influence disturbing effects of the noise should be investigated. One of them is the connection between movement of noise-source and features of the sound field. The authors measured noise excited by helicopter — as a noise-source — at ground observing points. This paper shows influences of engine power on the noise level.

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