• Title/Summary/Keyword: Sound insulation performance

Search Result 244, Processing Time 0.029 seconds

Comparison of vibration and noise characteristic of high efficiency Insulation Panel for Transformer (변압기용 고효율 차음판의 진동 및 소음 비교)

  • Jeong, J.H.;Jang, Y.S.;Lim, D.S.;Kim, J.;Choi, B.K.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2008.04a
    • /
    • pp.1005-1009
    • /
    • 2008
  • The high efficiency insulation panel for transformer construction is needed in residential area because the making noise from transformer substation in side of city is appeared a lost of problem by increasing to conserve the living environment. Therefor in this paper, first the vibration and noise characteristic of existing insulation panel is analyzed according to attached material, cork and sponge-type. Second the insulation of sound performance is compared between the existing insulation panel. And high efficiency insulation panel that is proposal in this paper.

  • PDF

Acoustic Study of light weight insulation system on Dash using SEA technique (SEA 기법을 이용한 저중량 대시판넬 흡,차음재 성능에 대한 연구)

  • Lim, Hyo-Suk;Park, Kwang-Seo;Kim, Young-Ho;Kim, In-Dong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.05a
    • /
    • pp.51-55
    • /
    • 2007
  • In this paper Statistical Energy Analysis has been considered to predict high frequency air borne interior noise. Dash panel Insulation is major part to reduce engine excitation noise. Transmission loss and absorption coefficient are considered to predict dash insulation performance. Transmission lose is derived from coupling loss factor and absorption coefficient is derived from internal damping loss factor. Material Biot properties were used to calculate each loss factors. Insulation geometry thickness distribution was hard to measure, so FeGate software was used to calculate thickness map from CAD drawing. Each predicted transmission losses between conventional insulation and light weight insulation were compared with SEA. Transmission loss measurement was performed to validate each prediction result, and it showed good correlation between prediction and measurement. Finally interior noise prediction was performed and result showed light weight insulation system can reduce 40% weight to keep similar performance with conventional insulation system, even though light weigh insulation system has lower sound transmission loss and higher absorption coefficient than conventional system.

  • PDF

Sound Insulation Performance of the Multi-layered Window Structures for the Express Trains (고속철도 차량용 다층 유리창 구조의 차음성능)

  • Lee, Ho-Jin;Lee, Jung-Hyeok;Park, In-Seok;Kim, Seock-Hyun
    • Proceedings of the KSR Conference
    • /
    • 2011.10a
    • /
    • pp.2256-2262
    • /
    • 2011
  • In this study, sound transmission loss (STL) is investigated on the multi-layered windows used in the KTX-sancheon and next generation HEMU-400x high speed train. Using TLOSS, which is developed as a special purpose STL analysis program, STLs of the multi-layered glass windows are analytically investigated and compared with the mass law result. Window specimens for the two train models are manufactured and intensity transmission losses are measured based on ASTM E2249-02. The problems in aspect of sound insulation are diagnosed on the two window models. The aim of this study is to provide useful data for the improvement of the interior noise in the high speed train.

  • PDF

Korean Standard Draft of the Laboratory Method of Measuring the Airborne Sound Insulation of a Suspended Ceiling (매단 천장의 실간 공기전달음 차단성능 측정방법의 KS규격화 방안)

  • Yang, Kwan-seop;Lee, Keun-hee;Kim, Sun-woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.11a
    • /
    • pp.393.1-393
    • /
    • 2002
  • Offices and other multipurpose buildings commonly have suspended ceilings installed over room dividing wall. But Korean Standards don't include any code on test methods and test facility of the suspended ceiling system. Therefore, test methods and test facility from ISO and ASTM have been used for evaluating sound performance in domestic so far. In this study, Korean Standards draft on test methods and test facility of suspended ceiling system and materials is proposed on the basis of ISO and ASTM.

  • PDF

Investigation on the Laboratory Method of Measuring the Airborne Sound Insulation of a Suspended Ceiling (매단 천장의 실간 공기전달음 실험실 측정 방법 고찰)

  • 양관섭;이근희;김선우
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.1126-1131
    • /
    • 2002
  • Offices and other multipurpose buildings commonly have suspended ceilings installed over room dividing wall. But Korean Standards don't include any code on test methods and test facility of the suspended ceiling system. Therefore, test methods and test facility from ISO or ASTM have been used for evaluating sound performance in domestic so far. In this study, every regulation from ISO, ASTM, especially for airborne sound insulation against suspended ceiling system, is analyzed in order to apply to establishment of Korean Standards on test methods and test facility of suspended ceiling system and materials.

  • PDF

Effects of Boundary Damping in the Prediction of Sound Insulation Performance of the Double Partition with Air-gap (중공 이중판의 차음손실 예측에 있어서 경계손실이 미치는 영향)

  • 이종화;이정권
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.873-876
    • /
    • 2002
  • It has been reported that discrepancies exist in the case of double panels with an air layer when the measured sound transmission loss is compared with the calculated values. It has been known that the cause of this discrepancy is in major from the unavoidable dips associated with the double wall resonances. In this work, several correction methods to make up for such resonances are studied. In particular, the ‘boundary damping’concept is revisited and its effects are discussed by comparing with measured values. It is shown that the correction methods are necessary for the sound insulation analysis of double partitions with an air layer, in order to ascertain the quantitative correlation between measured and predicted values.

  • PDF

Transmission Loss Analysis of the Fiber Sandwich Panels for a Tilting Train (틸팅열차용 화이버 다층재의 차음성능 해석)

  • Kim, Seock-Hyun;Paek, In-Su;Kim, Jae-Cheol
    • Proceedings of the KSR Conference
    • /
    • 2008.06a
    • /
    • pp.2191-2194
    • /
    • 2008
  • This paper investigates the sound insulation performance of the fiber sandwich panels for a tilting train. Due to the high strength and low mass, fiber sandwich panels are widely used for aircraft structures, railway vehicle structures. These fiber sandwich panels show orthotropic behavior because of the fiber's structural characteristics. This orthotropy often reduces the critical frequency and makes negative effect on the sound insulation performance. In this study, transmission loss of the fiber panels is analyzed based on the equivalent orthotropic plate model. An analysis program is developed to calculate the transmission loss of the fiber sandwich panels. Using the program, the coincidence frequency ranges and their effects on the transmission loss are investigated.

  • PDF

Transmission loss of Honeycomb Composite Panel of the Tilting Train (틸팅 열차용 허니콤 복합판재의 투과손실)

  • Kim, Seock-Hyun;Lim, Bong-Gi;Kim, Jae-Chul;Jang, Yun-Tae
    • Proceedings of the KSR Conference
    • /
    • 2009.05a
    • /
    • pp.1088-1091
    • /
    • 2009
  • In a tilting train, aluminium honeycomb composite panel is used for the high speed and light weight. Side wall of the tilting train includes the composite panel of carbon fiber, aluminium honeycomb and epoxy fiber as a main structure. In this study, we measure the transmission loss (TL) of the honeycomb composite panel and analyse the sound insulation performance by using the orthotropic plate model. We investigate experimentally how the air gap, plywood and glass wool improve the sound insulation performance of the composite panel. The purpose of the study is to provide practical information for the improvement of TL of the honeycomb composite panel used for the tilting train.

  • PDF

A study on the characteristics of high frequency road noise transmission at the rear seat of a hatch back compact car using PBNR (Power Based Noise Reduction) method (파워기반 소음감소 기법을 이용한 준중형 해치백 후석 고주파성 로드노이즈 전달특성 연구)

  • Lee, Jonghyun;Cho, Sehyun;Yi, Juwan;Lee, Chulhyun;Yang, Jungmin
    • The Journal of the Acoustical Society of Korea
    • /
    • v.37 no.4
    • /
    • pp.248-255
    • /
    • 2018
  • It is known that the road noise on the rear seat of a hatchback type car is worse than that of a sedan type car because of the weakness on sealing structure. Therefore, a sound sealing system and sufficient absorption/insulation performance are required. In the case of a compact segment car, however, the application of the sufficient absorption and insulation materials is limited, because of the restriction on the production cost and weight of the car. In this study, we estimate the noise transmission path on the vehicle's body structure from tires and ground using the PBNR (Power Based Noise Reduction) method which is useful in quantitative measurement. Based on these results, we suggest an alternative absorption/insulation method for the better performance of rear seat road noise reduction in a compact hatchback car.

Prediction of Acoustic Performance of Sound Barrier Using Multiple Random- Point Impact (임의의 다중 점가진을 이용한 흡차음재의 성능 예측)

  • 신재성;강연준
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.11b
    • /
    • pp.877-881
    • /
    • 2001
  • In this paper, a model is developed that can predict insulation performance of sound barrier systems under the action of multiple random point impact. The predicted results are compared with the measured results obtained by using APAMAT II. The results show the error due to the difference between experimental environment and theoretical assumptions. The model is needed to be improved to obtain better agreement between predicted and measured results.

  • PDF