TY - GEN
T1 - Case study on acoustic improvement by refurbishment with natural elements in a courtyard
AU - Yang, Hong Seok
AU - Kim, Myung Jun
AU - Kang, Jian
PY - 2012
Y1 - 2012
N2 - Courtyards surrounded by buildings often have acoustic defects such as strong flutter echoes and long RT (reverberation time), which could cause annoyance for the users of the courtyard, as well as people in adjacent buildings due to the enhanced noise level by multiple reflections. Therefore, it is important to absorb and diffuse sound energy propagating in such courtyards. The aim of this paper is to investigate the acoustic effectiveness of natural elements in such situations. Through a case study, the acoustic effects of natural elements were examined using in-situ measurement with and without natural elements. The parameters considered are RT, EDT (early decay time) and sound attenuation. The experimental result suggest that natural elements with wood decking and vegetation have a strong effect in reducing RT and EDT at 500 Hz, by about 47% (from 3.2 sec to 1.7 sec) and 87% (from 1.5 sec to 0.2 sec). It was also found that the natural elements can reduce RT effectively at low frequency in comparison with high frequency. For sound attenuation, sound level was decreased by around 3 dB in unweighted overall level by the natural elements.
AB - Courtyards surrounded by buildings often have acoustic defects such as strong flutter echoes and long RT (reverberation time), which could cause annoyance for the users of the courtyard, as well as people in adjacent buildings due to the enhanced noise level by multiple reflections. Therefore, it is important to absorb and diffuse sound energy propagating in such courtyards. The aim of this paper is to investigate the acoustic effectiveness of natural elements in such situations. Through a case study, the acoustic effects of natural elements were examined using in-situ measurement with and without natural elements. The parameters considered are RT, EDT (early decay time) and sound attenuation. The experimental result suggest that natural elements with wood decking and vegetation have a strong effect in reducing RT and EDT at 500 Hz, by about 47% (from 3.2 sec to 1.7 sec) and 87% (from 1.5 sec to 0.2 sec). It was also found that the natural elements can reduce RT effectively at low frequency in comparison with high frequency. For sound attenuation, sound level was decreased by around 3 dB in unweighted overall level by the natural elements.
UR - http://www.scopus.com/inward/record.url?scp=84883593281&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84883593281
SN - 9781627485609
T3 - 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012
SP - 8897
EP - 8907
BT - 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012
T2 - 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012
Y2 - 19 August 2012 through 22 August 2012
ER -