• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2007.05a
• /
• pp.1152-1155
• /
• 2007

Lately concerns about structure have been increased by advantages of floor impact noise, poilitical induction and changeability. Hence, Flat Plate Structure has been constructed increasingly. This study shows the comparison of the performance of sound insulation of Flat Plate Structure System and the existing Wall Structure. For this study, taking the same level organization of Daelim Architectural Environmental Research Center, I found the performance of sound insulation between the upper and lower floors about Wall Structure and Flat Plate Structure. Consequently, the performance of sound insulation between upper and lower floors of Flat Plate Structure was 3-5dB higher was approximately 3-5dB higher than one of Wall Structure. Especially, the performance of sound insulation on the upper floor was 1-3dB higher than on the lower floor. In addition, as the result of comparing radiation sound which radiates from the wall of lower floors with each structure system, Flat Plate Structure was about 4dB higher with Rw than Wall Structure. As we see totally, the performance of sound insulation of Flat Plate Structure is highter than one of the Wall Structure. It is 3-5dB higher and the main reason for this result depends on the existence of the wall which can radiate sound and nonexistence.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.26 no.5
• /
• pp.49-56
• /
• 2022

In this study, numerical simulations for reducing noise between floors in an apartment building was carried out using Active Noise Control (ANC) technology. In order to examine the feasibility of using ANC to reduce noise between floors, accelerometers and microphones for noise collection were installed in the inter-floor noise test facility to measure noise and vibration caused by the impact ball drop test. By using the measured data, Filtered-x Least Mean Square (Fx-LMS) algorithm-based ANC simulations were carried out. In the simulations, after deriving optimal simulation conditions including the adaptive control convergence coefficient, the noise reduction effect was analyzed through numerical simulations using the number of installed accelerometers and speakers as variables. Finally, it was confirmed that the noise between floors could be reduced using ANC technology under limited conditions.

• Elastomers and Composites
• /
• v.49 no.2
• /
• pp.95-102
• /
• 2014

The noise between floors of apartment has been hot issue nowadays. In order to improve the noise insulation performance, we proposed the antivibration rubber system which can be applied to the floor system for sound insulation. Among various types of elastomer, butyl rubber showed the good aging characteristic, low rebound resilience and high damping factor. Thus, the butyl rubber was selected as a basic rubber for antivibration rubber system. The effects of type and loading amounts of carbon black on antivibration properties of butyl rubber were studied. The increase of surface area and the content of carbon black resulted in high bound rubber fraction, high mechanical property, low rebound resilience, and high damping factor of butyl rubber. Based on the results of this study, the new antivibration rubber was prepared and applied to the floor system for sound insulation. The impact sounds of floor system proposed in this study were 40 dB and 43 dB in cases of light weight and heavy weight impact sound, respectively.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2006.11a
• /
• pp.950-953
• /
• 2006

The floor impact noise of concrete structures in apartments buildings is affected from the flexural wave propagation characteristics. Accordingly, the measurement of wave propagation characteristics is required for suggestion of efficient method to reduce the impact noise. The purpose of this article is to propose an experimental technique to measure dynamic properties of concrete structures. The method was proposed using the flexural wave propagation characteristics. Wave speeds, bending stiffness and their loss factors are estimated from which the vibration dissipation capabilities are investigated. Several different concrete beam structures were custom-built for measurement. The damping treatments using viscoelastic materials for reducing noise generation are also tested. The beam transfer function of the damped beam is predicted using the compressional damping model from which the mechanism of the vibration energy dissipation is investigated.

• Journal of KSNVE
• /
• v.9 no.3
• /
• pp.477-484
• /
• 1999

This study aims to present proper thickness of resilient mount and pattern of chips for the improvement of impact sound isolation. To achieve this aim, field tests were performed to evaluate the performance of impact sound isolation of pilot samples using waste tire chips against light and heavy-weight impacter, which samples were installed over concrete slabs of an apartment housing. In this study, the experiments were performed by the impact sound level of floors in KS F 2810 "Method for field measurement of floor impact level". As results, a flooring structure using waste tire chips as a resilient mount, with no relation to chip's types, has enhanced performance by 1~2 degree in light impact sound isolation, while it has improvement in heavy impact sound isolation. And fiber-type chips have better performance than granule-type ones when they overlaid concrete slab with 15~20 mm of thickness. For the improvement of impact sound isolation, it is recommended that insulating materials should be applied at joints between floating floors and walls, or floating floors and a doorframes, and also waterproof papers should be used for the effective thickness of resilient mount.ent mount.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2006.05a
• /
• pp.1252-1255
• /
• 2006

The government has enforced Housing Performance Grade Indication System (Article 21, Paragraph 2 of Housing Act) starting January 2006 for the purpose of giving users in hope of toying an apartment opportunities to select housing based on personal preferences by providing information on housing performance at the time of tenant recruitment announcement as well as securing desirable environment (comfort) by encouraging construction companies to build housing of the indicated performance level. The acoustic performance indication items include three items such as floor impact isolation performance(light weight impact sound, heavy weight impact sound), bathroom noise and insulation performance of boundary walls between households. This paper explains the background, the basis of creation and evaluation method focused on the acoustic environment performance helping for the developer of technique and a staff in charge of construction business who cope with this system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2004.11a
• /
• pp.976-979
• /
• 2004

The KS of 'Laboratory Measurement of Impact Sound Insulation of Floors' is not established yet. To establish this KS, present conditions of domestic laboratory test facilities for measuring impact sound insulation of floors in laboratory and current researches were reviewed As a result the outline of 'Laboratory Measurement of Impact Sound Insulation of Floors' is suggested.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2005.11b
• /
• pp.69-72
• /
• 2005

In this paper, FSTL(field sound transmission loss) measured in the mock-up is studied and compared to the STL measured in laboratory. A mock-up is built by using 6t steel plate, and two identical cabins are made where 25t or 50t panel is used to construct wall and ceiling inside the steel structure. Various wall panels and ceilings are tested, where the effects of U/T, sealing, panel thickness, ceilings are studied. It is shown that the effect of ceiling thickness is negligible and FSTL is lower than STL by 5-7 dB due to several flanking paths.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2001.05a
• /
• pp.1077-1082
• /
• 2001

기존의 타이어를 사용한 중량충격음에 대한 차음성능 평가방법의 타당성을 살펴보기 위하여 청감실험에 의한 감성적 반응결과와 L등급 및 Leq에 의한 평가 결과를 비교 분석하였다. 동일한 바닥충격원에 대한 분석결과 L등급평가 보다 Leq에 의한 평가가 청감실험의 반응에 잘 대응하는 것으로 나타났다. 또한, Zwicker parameters 중 Loudness와 Unbiased Annoyance는 청감실험과 가장 유사한 경향을 보였다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2012.10a
• /
• pp.673-674
• /
• 2012