GB/T 1859.1-2015: Translated English of Chinese Standard. (GBT 1859.1-2015, GB/T1859.1-2015, GBT1859.1-2015): Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 1: Engineering method
https://www.chinesestandard.net, 24. jun. 2018 - 37 sider
This Part of GB/T 1859 specifies the measurement method for sound power level of reciprocating internal combustion engines - engineering method. This Part is applicable to reciprocating internal combustion engines (unless otherwise specified, hereafter known as engines for short) in the scope of application of GB/T 6072.1, and other internal combustion engines to which no suitable standards apply.
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1/3 octave-band A-weighted or frequency A-weighted sound power accuracy class Acoustic environment acoustic field acoustic free field average sound pressure background noise correction background noise criteria band sound power calculated according center frequency decibels dB diagram for measurement Engineering method environmental correction K2 hemi-anechoic room installation conditions internal combustion engines level of standard mean deviation measurement distance measurement is invalid measurement method measurement of sound measurement result measurement system measurement uncertainty Measuring instruments measuring the sound meet the requirements microphone position mounting base noise measurements Noise radiation Note on-site meteorological conditions pressure level measured Reciprocating internal combustion reference meteorological conditions reproducibility standard deviation result of sound room sound absorption sound calibrator sound level meter sound power level sound pressure level source being measured specified in GB/T square meters m2 standard sound source surface and microphone surface sound pressure Survey method Table B.2 test environment time-averaged sound pressure unit measurement bodies