GB/T 1859.2-2015 Translated English of Chinese Standard. (GBT 1859.2-2015, GB/T1859.2-2015, GBT1859.2-2015): Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 2: Survey methodhttps://www.chinesestandard.net, 2018. 6. 24. - 33페이지 This Part of GB/T 1859 specifies the measurement method for sound power level of reciprocating internal combustion engines - survey 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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A-weighted Acoustic environment acoustic field Acoustic free field average sound pressure background noise correction box Reflecting plane calculated according ceiling correction ASSUME K2=0 corresponding rotational speed decibels dB deviation of sound diagram for measurement environmental correction ASSUME environmental correction K2 formula A.2 hemi-anechoic room internal combustion engines level of standard mean deviation measurement is invalid measurement of sound measurement result measurement system Measuring instruments measuring the sound meet the requirements microphone position noise measurements Noise radiation noise sound pressure on-site meteorological conditions plane of reference pressure level L′pm pressure level measured Reciprocating internal combustion Reference box Reflecting reference meteorological conditions reference sound source result of sound room sound absorption sound absorption amount 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 time-averaged sound pressure unit measurement bodies