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연준오(Yeon, Joon-Oh),김경우(Kim, Kyoung-Woo),양관섭(Yang, Kwan-Seop) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.5
Eco-friendly material applied to building would be one of the materials which is must developed for global environmental conservation and reduction of carbon dioxide. For development of eco-friendly material, a cellulose absorber has been developed with waste paper through adjustment of various mix proportions. The developed cellulose absorber has been tested for its acoustic properties such as absorption coefficient and dynamic stiffness. The absorption coefficient was evaluated by developing six samples and using impedance tube and reverberation chamber. As a result of the evaluation, 0.64(NRC) was secured in absorption coefficient and 4.7 $MN/m^3$ was indicated in dynamic stiffness. Also, for practical use of developed absorbers as inner heartwood in drywall, comparison test of sound reduction index was performed with existing glass wool absorbers and constructed drywall of gypsum board. The results have shown 55 dB(Rw) of sound reduction index in glass-wool wall and 46 dB(Rw) in cellulose.
연준오(Joon-oh Yeon),김경우(Kyoung-woo Kim),양관섭(Kwan-seop Yang) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
Eco-friendly material applied to building would be one of the materials which is must developed for global environmental conservation and reduction of carbon dioxide. For development of eco-friendly material, a cellulose sound-absorbing material has been developed with waste paper through adjustment of various mix proportions. The developed cellulose sound-absorbing material has been tested for its acoustic properties such as acoustic absorptivity and dynamic elastic modulus. The absorptivity was evaluated by developing six samples and using impedance tube and reverberation chamber. As a result of the evaluation, 0.64(NRC) was secured in absorptivity and 4.7 MN/㎥ was indicated in dynamic elastic modulus. Also, for practical use of developed sound-absorbing material as inner heartwood in drywall, comparison test of sound reduction index was performed with existing glass wool sound-absorbing material and constructed drywall of gybsum board. The results have shown 55dB(Rw) of sound reduction index in glass-wool wall and 46dB(Rw) in cellulose.
건식이중바닥구조와 하부 천장구조의 조합에 따른 바닥충격음 평가
연준오(Yeon, Jun-Oh),김명준(Kim, Myung-Jun),김경우(Kim, Kyoung-Woo),양관섭(Yang, Kwan-Seop) 한국건축친환경설비학회 2016 한국건축친환경설비학회 논문집 Vol.10 No.3
In the present study, floor impact sound reductions by floor structure and ceiling were investigated. Upper layer of a dry double floating floor was made of recycled materials. Also, steel as well wooden beams were applied to the dry double floating floor then impact sound insulations of them were measured. It was found that light-weight impact sound insulation of the floor with steel beam was improved by 4 dB (L"n,AW) compared to the floor with wooden beam. Moreover, heavy-weight impact sound insulations of the floor with steel beam were enhanced by 3 dB and 4 dB (L"i,Fmax,AW), respectively using bang machine and rubber ball. As a second experiment, the impacts of ceiling aperture on the floor impact sounds were measured while the steel beams were installed to the dry double floating floor. The light-weight impact sound insulation was found to be best, 32 dB when apertures were applied to perimeters of coffered ceiling. The heavy-weight impact sound insulation measured by the bang machine was 48 dB when the apertures were installed to moldings. In contrast, two experimental cases without any aperture and apertures on perimeters of the coffered ceiling showed best heavy-weight impact sound insulations of the rubber ball (40 dB). Lastly, influences of impact positions on single number ratings were investigated. It was observed that there was not a significant relationship between impact positions and single number ratings.
바닥 표면 마감재에 의한 실충격원 및 중량충격음 저감량 평가
연준오(Yeon, Jun-Oh),김명준(Kim, Myung-Jun),이성찬(Lee, Sung-Chan) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.4
This study aims to reduce the impact noise generated by real life in the apartment house through the application of floor covering materials. The impact force of real life noise varies according to behaviors, however a child jumps onto the floor from a height of 50 cm, the impact force is about 1100 N. This weight impact force is similar to that of a rubber ball fallen from 40 cm height which is regulated by KS. In order to reduce the noise of real life, experiments were carried out with floor covering materials such as PVC series, reinforcement, and ondol floor. According to application of different floor covering materials, there is a difference up to 300 N in case of an adult walking on the floor. Also, the case of rubber ball falling from 40 cm, it shows reduction over 50 N maximum. The light weight impact noise reduction performance of the same floor coverings material was increased as frequency goes to higher band. In addition, the difference in abatement performance was apparent due to the increase in the thickness of the floor coverings material of the PVC series. Dropping rubber ball from 40 cm height, the reduction performance appeared to be the best at 6.0 mm of PVC-based floor coverings.