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A Study on Emission Limits of Structure-Borne Noise from Fixture Transmitted into Room

Author: LinQiLi
Tutor: DiGuoQing
School: Zhejiang University
Course: Environmental Science
Keywords: Indoor noise Structure-borne Emission limits Subjective annoyance
CLC: TB533
Type: Master's thesis
Year: 2012
Downloads: 23
Quote: 0
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Abstract


Spread fixed equipment the indoor noise emission limits implementation process for the current structure is not excessive noise nuisance and exceeding not disturbing the practical, spread fixed equipment indoor noise pollution status of the investigation of the structure. For the study and reasonably determine the fixed equipment is spread through the structure to the indoor noise emission limits, refer to the the foreign current indoor noise evaluation curve, taking into account China's pollution status and technical and economic level proposed adjustments, the current limit. Separately adjust the center frequency of 31.5Hz-500Hz octave bandwidth pink noise sound pressure level to the current limit and adjust the recommended limit, the synthesis of the original sound samples and compared the sound sample, both subjective troubles were compared. The results show that the test to evaluate the subjective annoyance of the original sound samples is greater than the contrast ratio of the sound samples are more than 72%, and the difference between the original sound samples C sound level and A sound level, low frequency (16Hz ~ 63Hz), octave band sound pressure the arithmetic mean value of the difference between the line RC reference curve sound pressure line were higher than the comparison sound samples 3.4 ~ 4.4dB and 8.8 ~ 10.9dB, original sound samples significantly greater than the proportion of low-frequency sound energy compared sound samples. Relative to the current standard spread to the indoor noise limits, according to the recommended limit control structure, subjective and objective evaluation results consistency better. Further analysis of the case of the large number of complaints, found that the structure of to spread fixed equipment interior noise 31.5-500Hz octave band sound pressure level is lower than the current standard limits and adjusted standard limits, and the A sound level is lower than the current limit, there is still residents complain of noise and acoustic analysis of these samples and found that the proportion of its band sound energy imbalance is more significant, with higher noise annoyance, it is recommended that further quality evaluation index QAI lt; 5dB spread as a control structure to indoor noise Case produce one of the emission limits, this can effectively avoid the serious imbalance in the distribution for each band acoustic energy in noise below the limit case, to have a greater impact on indoor acoustic environment. Further studies showed that, by the sound pressure level on the structure-borne noise pollution around the octave increment more than 5dB in the QAI lt; 5dB cases, if the civil construction indoor, will continue to lead to greater noise annoyance caused complaints from residents this before and after the structure-borne noise pollution, it is recommended that any octave band sound pressure level increment does not exceed 5dB also spread as a control structure to indoor noise emission limits

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > The occurrence of vibration and noise
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