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Experimental Study on Standard Limits of Indoor Noise
LIN Qi-li;CAO Yong;DI Guo-qing;HE Ling-jiao
   2011, 31 (3): 112-114.   DOI: 10.3969/j.issn.1006-1355-2011.03.026
Abstract （1567）            Save
Present room emission limits of fixed equipment noise transmitted by structures are considered incapable to predict subjective perception rationally. In this study, white noise of 31.5 ~ 500 Hz octave bands through filtration is adjusted to the sound pressure levels (SPL) of standard limits to form the original sound samples. New sound samples are produced by moderately adjusting the SPL of these 5 octave bands. Subjective annoyance tests are carried out using paired comparison method. The results indicate that, under the condition of equal A-weighted SPL or equal loudness levels, the new sound samples, whose SPL of 31.5 Hz and 63 Hz octave bands are reduced and SPL of 125 Hz and 250 Hz and 500 Hz octave bands are increased, are less annoying than the original sound samples. There is a significant correlation between SPL of 31.5 Hz octave band and the subjective annoyance rating (p < 0.01), and Pearson’s correlation coefficient is 0.925 ~ 0.951.
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Slipway noise control and prediction of noise reduction
LI Zheng-guang;DI Guo-qing;SHI Xiang;ZHENG Yue
   2011, 31 (2): 52-55.   DOI: 10.3969/j.issn.1006-1355-2011.02.013
Abstract （2165）            Save
Some measures for noise control of slipway and prediction of noise reduction effect are proposed. An actual case of slipway noise control is taken as an example. According to the characteristic of the slipway noise, a noise source model is built, and the noise reduction effect of these measures for noise control is predicted. The results show that the comprehensive treatment, including sound source control, sound transmission control and production management, is necessary to control the noise. In addition to considering the noise reduction effect, engineering feasibility, cost as well as social factors also need to be considered in building the sound barriers. This work provides a reference for slipway noise control and prediction.
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