Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Floor Impact Sound Pressure Level Characteristics by the Change of Reverberation Time in a Reverberation Chamber

수음실 잔향 시간변화에 따른 바닥충격음레벨 특성 - 잔향실을 중심으로 -

  • Jeong, Jeong Ho (Building Materials & Environment Team, Fire Insurers Laboratories of Korea) ;
  • Kim, Jeong Uk (Building Materials & Environment Team, Fire Insurers Laboratories of Korea) ;
  • Jeong, Jae Gun (Building Materials & Environment Team, Fire Insurers Laboratories of Korea)
  • Received : 2013.01.17
  • Accepted : 2013.02.26
  • Published : 2013.03.20
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Abstract

Field measurement method of heavy/soft impact sound pressure level which is regulated in JIS and ISO has been using in Korea, Japan and Canada. It is reported that heavy/soft impact sound pressure level was varied by the sound field condition of receiving room such as sound absorption power and room volume. In this study, it is checked that heavy/soft impact sound pressure level was affected by the receiving sound field condition. Rubber ball and bang machine sound pressure level was measured in the vertically connected reverberation chamber. In oder to check the effect of receiving sound field on heavy/soft impact sound pressure, sound absorption power was changed with polyester sound absorption blankets with air space and glass wool. The reverberation time at 1 kHz band was changed from 10 s to 0.2 s by sound absorption material. Rubber ball sound pressure level measured without sound absorption material was 58 dB in $L_{i,Fmax,AW}$, but the level was 46 dB with sound absorption treatment. From this result, it is confirmed that sound field correction method is needed in the heavy/soft impact sound pressure level measurement method using bang machine and rubber ball.

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References

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  1. A Study on the Reverberation Time Characteristics of Inside Space of Apartment Buildings vol.25, pp.4, 2015, https://doi.org/10.5050/KSNVE.2015.25.4.291
  2. Effect of Directivity and Position of Sound Source When Measure Reverberation Time for the Correction of Receiving Room vol.28, pp.4, 2018, https://doi.org/10.5050/KSNVE.2018.28.4.388