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INFLUENCE OF SOUND SOURCE LOCATION AND ABSORPTION ON DETERMINATION OF SOUND POWER LEVELS
Darije Varžić
; Zavod za unapređivanje sigurnosti, Osijek, Hrvatska
Jurij Prezelj
; Univerzitet u Ljubljani, Slovenija
Sažetak
Experimental research was performed to reveal detailed influence of two factors on measurement of sound power level according to ISO 3744:2010; location of a sound source in the room and reverberation time of the room. In industrial environment, large machines are often grounded near reflecting surfaces therefore some criteria from the standard can not be satisfied, or are only just satisfied. Additionally, most of the rooms can not satisfy required magnitude of the environmental correction so we selected to examine the influence of different acoustic absorption of the room. The main goal of the research was to determine the standard deviations of measured sound power levels as a measure of repeatability in different measurement conditions. Differences in the results of sound power level measurements were within the deviation value of 1 dB (A). The lowest measured value was obtained when source was located near the middle of the room and with the most covered room with absorbent material. Maximum value was measured when the source was located near the boundary surface of the room without absorption material.
Ključne riječi
sound power level; noise; mechanical equipment; maintenance
Hrčak ID:
155896
URI
Datum izdavanja:
21.12.2015.
Posjeta: 2.154 *