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Zajterhelés csökkentése helikopterekben akusztikus zajcsillapító anyagok alkalmazásával Operators of military vehicles are subject to harsh noise loads. In some cases this is severe enough to warrant long-term health impacts; in order to avoid this, restricted operating hours for various noise levels are prescribed. In case of rotorcraft vehicles, both the rotor and its driving engine are serious sources of noise, therefore the crew can only spend their operating hours using (active or passive)doi:10.32562/mkk.2019.1.8 fatcat:o44s7qi5ebgnnjgvynxbh3dsp4