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연준오(Jun-oh Yeon),김경우(Kyoung-woo Kim) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.12
The useful practical land shall be reserved when an artificial land covers the railway and road. However, the problem is that since the artificial land places directly on the top of noise sources likely on the railway and road there will arise the weak points, noise and vibration. On this study based on creating the artificial land on the top of a railway vehicle base and placing a tenement on that land, it was comprehended the noise influence from the railway car through the simulation. In order to secure the input value for the simulation, at first measured the noise condition of the railway station building and the railway vehicle base. The output value for the railway station building (place A) was around (53.6~57.6) dB(A), the equivalent continuous sound level for an hour, and for the railway station building (place B) it was around (63.7~68.9) dB. The maximum outdoor noise of the tenement on the artificial land was measured as 64.1 dB(A) under the fixed condition on the simulation modeling. The built purpose of placing the artificial land to prevent the noise influence from the railway met the expectation to be less influenced on the tenement. Rather, because of placing the artificial land the noise level on the lower space could be increased so there requires having a noise control.
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.
연준오(Junoh Yeon),김경우(Kyoungwoo Kim),최현중(Hyunjuong Choi),양관섭(Kwanseop Yang),김경호(Kyungho Kim) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
The 1st assessment (performance test) was applied to assure the floor impact sound performance for developing the dry double- floor with the change of rubber hardness of the upper panels support and the ceiling structure of the sub-floor. Depends on the change of the rubber hardness in substructure, the heavy-weight sound impact value is improved up to 3 dB, and the light-weight sound impact value is moved up to 21 dB, comparing with the bare-slab. Also, the improved value for the floor impact sound conjugating with the sub-floors ceiling was 5dB. Based on this result, the 2nd assessment (performance test) was made the state that the rubber hardness of the sub-floor support was ranged between 50 and 70 for considering the stability of walking patients. In addition to this process, the assessment was carried out with a variety of ceiling structure applied to the dry doublefloor structure with the air flow system on the sub-floors ceiling. The result for the 2nd assessment proved that TYPE-11 had the better sound reduction performance in the heavy-weight impact sound test than other types, and also for the light-weight impact sound TYPE-11 had the 29 dB sound reduction performance overall. Henceforth, based on the result the research for the sound reduction performance from the floor impact sound shall be ongoing process as well as the development of a double-dry floor and a sound reduction ceiling to suitable on the field.