• Title/Summary/Keyword: Sound insulation performance

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Development of decision making index for balcony extension in apartment houses (로지스틱 회귀분석을 이용한 공동주택 발코니 확장)

  • Lee, Hye Lin;Park, Min Ha;Ko, Yong-Ho;Han, SeungWoo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.11a
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    • pp.83-84
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    • 2015
  • Remodeling of apartment houses has been increasing recently and residents have chosen to extend the balcony along with the legalization of balcony extension in apartment houses. Balcony extension provides residents more space, however, it has been investigated that balcony extension increases construction cost, heating and cooling cost and decreases sound insulation performance. Therefore, this study focuses on developing a decision making index for residents in remodeling required apartment houses. The suggested methodology involves surveying actual residents, survey analysis by AHP and decision model development using logistic regression analysis.

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Acoustic Modal Property of a Vehicle Passenger Compartment including Head Liner (헤드라이너를 포함한 승용차의 차실의 음향모드 특성)

  • Kim, Seock-Hyun;Lee, Jin-Woo
    • Journal of Industrial Technology
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    • v.22 no.A
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    • pp.43-48
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    • 2002
  • Acoustic modes of a vehicle compartment dominate the noise characteristics of the vehicle system in the low frequency range. Vehicle compartments have head liner and air gap of proper thickness to mount a interior lamp, as well as to have a good sound insulation and absorption performance. This study estimates the acoustic modal property of the medium size passenger car by experiment and by finite element analysis and also, investigates the effect of the head liner on the acoustic mode of the passenger compartment to obtain useful information for low noise compartment design.

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Comparison Study of Sound Transmission Loss in High Speed Train

  • Kim, Tae-Min;Kim, Jeung-Tae
    • International Journal of Railway
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    • v.4 no.1
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    • pp.19-27
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    • 2011
  • Many studies for improving the railway vehicle's performance and comfort such as speed, weight and noise are currently in progress. Improving the structural characteristics of the vehicle for greater noise insulation is considered important for reducing disturbance due to noise, but measuring transmission loss entails large costs. This study explores an alternative method for estimating and measuring the railway vehicle's transmission loss that involves on applying the numerical analysis coupled with scaled reverberation chamber measurement. The transmission loss measurement using scaled reverberation chamber was performed after the compensation value was found through 1mm thickness(1t) specimen. For numerical analysis, a commercially available acoustics solver VA ONE was used. The proposed method is found to lead to transmission loss measurement comparable to the measurements based on large-scale reverberation chamber. Thus, it can be argued that a reliable method has been developed for measuring railway vehicle's transmission loss.

An Experimental Study on the Properties of EPS Concrete according to the Variation of Mix Design (배합조건에 따른 경량 EPS 콘크리트의 물리적 특성에 관한 실험적 연구)

  • Lee, Jung-Koo;Jung, Eun-Hye;Gang, Cheol;Cho, Sung-Hyun;Jeong, Gab-Cheol;Kim, Jin-Man
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.833-836
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    • 2006
  • The purpose of study is to develope for lightweight concrete panel which have high quality with insulation performance of sound. The use of lightweight concrete products has been increased at a recently high structures. Also, the gathering of nature aggregate is limited, so that lack of fine aggregate is appearing. Statistical analysis is practiced on the properties of EPS concrete according to the variation of mix design. As a result saturated density is affected by amount of Bottom ash.Also compressive strength is affected by W/B ratio at the early age and amount of Bottom ash at the latter age.

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An Experimental Study on the Prediction Method of Light Weight Floor Impact Sound Insulation Performance of Apartment Floor Structures through Mini-Laboratory Tests (축소실험실을 이용한 바닥완충구조의 경량충격음 차음성능 예측방법에 관한 실험적 연구)

  • 송민정;장길수;김선우
    • Journal of KSNVE
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    • v.10 no.1
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    • pp.82-96
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    • 2000
  • The purpose of this study is to figure out the relationship between the mini-laboratory and the reverberation room for the domestic floor structures which are practically constructed in apartment houses. For this purpose, seven specimen which were varied in structures and thicknesses were tested in Chonnam National University reverberation room and in the artificial mini-laboratory which is the $\farc{1}{3}$ scale model of the former. From the result of this study, it was proved that there is a good correlation between the mini-laboratory and the reverberation room for the apartment floor structures as well as floorcovering PVC. The result of this study could save the labor and the time, etc.

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An Experimental Study on the Acoustic Characteristic of Korean Traditional Houses in Chonnam Province (전남 지방 전통주택의 음향특성에 관한 실험적 연구)

  • Lee, Tai-Gang;Kim, Hyung-Ryul;Kim, Hang;Choi, Eun-Suk;Kim, Sun-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.686-689
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    • 2005
  • This study aims to analyzed the acoustics characteristics of Korean Traditional Houses in Chonnam Province varied with lay out and floor plane to reflect the way of control for environmental condition. These houses are surveyed the reverberation time and level difference between rooms of the main living room and other main floored room, master room and kitchen. As a result, the reverberation time of traditional rooms are below 0.6 second, and the sound insulation performance of Korean traditional door are mostly very low grade with D-15. The level difference between rooms are low grade not to meet minimum class except between main living room and master room away from main living building.

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Development of Vermiculite Board to Secure the Fire Resistance Performance of Light-Frame Wood Structural Wall (경골목구조 벽체의 내화성능확보를 위한 질석보드 개발)

  • Yoo, Seok Hyung;Cheong, Chang Heon
    • Fire Science and Engineering
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    • v.32 no.1
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    • pp.40-45
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    • 2018
  • It is considered that vermiculite as an inorganic material is highly effective when it is used as a building finishing material because it is eco-friendly. Vermiculite has excellent properties such as fire resistance, heat insulation, sound absorption as well as prevention of condensation, deodorization and aesthetics. In this study, we developed a finishing board with vermiculite as its main material and mixed with mineral loose wool (VB-L) or mineral powder (VB-P), and conducted fireproof test and insulation test. In addition, fire resistance tests were carried out by applying the two developed vermiculite boards as finishing materials for the standard wall details of light frame wood structures (KS F 1611-1). As a result of the fire resistance test, the VB-L specimen showed better fire resistance than the VB-P specimen. Both vermiculite boards showed sufficient fire resistance performance of 2 hours for a thickness of 30 mm.

Analyses of the Railway Noise Transmission Characteristics of the Rooms in High-speed Train Stations Depending on Building Types (고속철도의 역사형식에 따른 철도소음의 실내 전달특성 분석)

  • Park, Chan-Jae;Haan, Chan-Hoon
    • The Journal of the Acoustical Society of Korea
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    • v.34 no.5
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    • pp.385-393
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    • 2015
  • The speed of train has rapidly been increased in accordance with the developed railway technology. Nowadays, high-speed trains were introduced which has the speed faster than 400 km/h. In Korea, a lots of efforts were undertaken to increase the speed of train faster than 350 km/h, however noise and vibration are still the main problems to solve for realization of the high-speed train. In the case of operation speed faster than 350 km/h, it can be easily presumed that the noise and vibration damages could be increased in the train stations which are close to the passing railway tracks. Thus, the noise in the five different types of high-speed train stations were analyzed including stations built on the ground, underground, under rail, and two types on rail. The present paper predicts noises inside the stations depending on the speed of the passing trains and analyze the noise comparing with noise criteria (NC). Sound insulation performance of each part of buildings was calculated using the transmission noise formula and computer modeling, Finally, a series of processes were introduced to satisfy the aural environment with the optimum interior noise criteria by changing interior finishing materials.

Comparison of Sound Transmission through Single and Double-layer Polymer Panels (폴리머계 단일 및 이중구조 방음패널의 차음특성 비교분석)

  • Kim, Il-Ho;Lee, Ju Haeng;Son, Jin-Hee
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.9
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    • pp.597-603
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    • 2014
  • The aim of the present study is to compare sound performance depending on thickness, materials, and structure of polymer soundproof panels consisting of PC, PMMA, HDPE, and PP, respectively. As a result of comparing sound transmission loss (STL) of single layer panel made of four types of polymer, the better sound transmission loss was obtained in order of PC, PMMA, HDPE, and PP, which was obviously followed mass law. 8 mm of single panel showed 5~6 dB(A) greater STL than that of 4 mm panels and lower frequency for coincidence effect so that STL of 8 mm panels decreased around 4,000~5,000 Hz, indicating less STL of 4 mm panels than those of 8 mm. When it comes to structure, 4 mm panels with air layer appeared similar value of STL with 8 mm single panels under 300 Hz. In range of high frequency above 2,000 Hz, 4 mm panels with air layer performed better than 8 mm of single layer panel while resonance effects were observed at 500~630 Hz. It was found that these results could be practically utilized as fundamental data for noise barriers design considering the change to each condition.

Flammability and Multi-objective Performance of Building Façades: Towards Optimum Design

  • Bonner, Matthew;Rein, Guillermo
    • International Journal of High-Rise Buildings
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    • v.7 no.4
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    • pp.363-374
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    • 2018
  • The façade is an important, complex, and costly part of a building, performing multiple objectives of value to the occupants, like protecting from wind, rain, sunlight, heat, cold, and sound. But the frequency of façade fires in large buildings is alarming, and has multiplied by seven times worldwide over the last three decades, to a current rate of 4.8 fires per year. High-performing polymer based materials allow for a significant improvement across several objectives of a facade (e.g., thermal insulation, weight, and construction time) thereby increasing the quality of a building. However, all polymers are flammable to some degree. If this safety problem is to be tackled effectively, then it is essential to understand how different materials, and the façade as a whole, perform in the event of a fire. This paper discusses the drivers for flammability in facades, the interaction of facade materials, and current gaps in knowledge. In doing so, it aims to provide an introduction to the field of façade fires, and to show that because of the drive for thermal efficiency and sustainability, façade systems have become more complex over time, and they have also become more flammable. We discuss the importance of quantifying the flammability of different façade systems, but highlight that it is currently impossible to do so, which hinders research progress. We finish by putting forward an integral framework of design that uses multi-objective optimization to ensure that flammability is minimized while considering other objectives, such as maximizing thermal performance or minimizing weight.