바닥 슬래브 진동 특성을 이용한 바닥충격음 요인 분석 연구 : 유효 평면 = The Study on Characteristic of Floor Impact Noise using the Structural Vibration on Floor Slab : Effective Plate

다국어 초록 (Multilingual Abstract)

In this study, a new method was proposed to set the area of a living room based on the vibration behavior of the floor slab. The area of a living room studied in this study was named as the “effective plate” which was referred to the plate theory. To investigate the influence of the effective plate on floor impact noise, a modal test was conducted, and the floor impact noise was measured in a mock-up structure with two different living room sizes with non-floating slabs. As a result, it was found that the similar vibration responses and floor impact noises were obtained for the different living room sizes. This was because although there was about 34% difference in floor area of the two living rooms, the effective plates of those cases were same as 40m2. In the high frequency range with sufficient mode density, similar vibration responses were obtained because the effective plates were similar in size, resulting in similar floor impact noises. In contrast, however, for the frequency bands below 100Hz with low mode density, significant differences in the vibration responses were observed due to the shape of the plate and location of the load-bearing wall. Consequently, it was determined that the living room shape and boundary condition, such as position of load-bearing wall, were the main influencing factors for floor impact noise in the low frequency range, whereas the size of the plate was the main influencing factor in the high frequency range. This means that it is necessary to consider the frequency band in the design of a floating floor to effectively reduce the floor impact noise.

참고문헌 (Reference)

• 1 김태민, "유한요소해석을 이용한 중량충격원 종류 및 평가지표 별 바닥충격음 예측 정확도 검증" 한국소음진동공학회 30 (30): 169-178, 2020
• 2 황재승, "완충재의 동특성에 따른 중량충격음 증폭에 관한 해석적 연구" 한국소음진동공학회 20 (20): 651-657, 2010
• 3 Chakraverty, S., "Vibration of plate" CRC Press 2009
• 4 Schiavi, A., "The"dust spring effect"on the Impact Sound Reduction Measurement Accuracy of Floor Coverings in Laboratory" 97 : 115-120, 2015
• 5 Cremer, L., "Structure-borne Sound: Structural Vibrations and Sound Radiation at Audio Frequencies" Springer Science & Business Media 2005
• 6 Fahy, F., "Sound and Structural Vibration:Radiation, Transmission and Response" Academic Press 1987
• 7 Jeong, J. H., "Single-number Quantities of Heavyweight Impact Sound Insulation" 105 (105): 5-8, 2019
• 8 Kim, T. M., "SEA-FEM Hybrid Analysis for Predicting Inter-floor Impact Noise" 129 : 397-407, 2018
• 9 Korean Industrial Standards, "Rating of Floor Impact Sound Insulation for Impact Source in Buildings and Building Elements - Part 1 : Floor Impact Sound Insulation Against Standard Light Impact Source"
• 10 Korean Industrial Standards, "Rating of Floor Impact Sound Insulation for Impact Source in Buildings and Building Elements - Part 1 : Floor Impact Sound Insulation Against Standard Heavy Impact Source"
• 11 Istvan, L. V., "Noise and Vibration Control Engineering: Principles and Applications" Wiley 1992
• 12 Ewins, D. J., "Modal testing: theory and practice" Research studies press LTD, John Wiley and Sons Inc 1984
• 13 Lyon, R. H., "Machinery Noise and Diagnostics" Butterworths-Heinemann 1987
• 14 Korean Industrial Standards, "KS F 2810-1:2015, Field Measurements of Impact Sound Insulation of Floors-Part 1: Method Using Standard Light Impact Source (equivalent ISO 140-7: 1998)"
• 15 Ministry of Land, "Infrastructure and Transport, No. 2015-997: Acceptance and Management Standards for Floor Impact Sound Insulation Structures in Apartment Buildings"
• 16 Korean Industrial Standards, "Field Measurements of Floor Impact Sound Insulation of Buildings-Part 2: Method Using Standard Heavy Impact Sources"
• 17 Inman, D. J., "Engineering Vibration" Pearson Higher Education 2013
• 18 Kim, T. M., "Effect of Structural Vibration and Room Acoustic Modes on Low Frequency Impact Noise in Apartment House with Floating Floor" 142 : 59-69, 2018
• 19 Im, J. B., "A Study on Dynamic Stiffness of Multi-layered Damping Materials" 1149-1152, 2007