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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