• Title, Summary, Keyword: Interior noise

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Evaluation of Interior Sounds of High-speed Trains Considering the Condition of Tunnel Running (터널 주행을 고려한 고속열차의 실내소음 특성 평가)

  • Kim, Jae Ho;Kim, Ho Jun;Jeon, Jin Yong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.3
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    • pp.253-260
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    • 2014
  • conducted. In-situ measurements were conducted to investigate the noise characteristics in high-speed trains such as KTX and KTX-Sancheon. Binaural microphones and spherical microphone were adopted to record and evaluate the spectral characteristics and noise incidence characteristics at the seats in the passenger cars. Environmental elements were also recorded during the noise measurements using a camcorder and GPS application. In addition, auditory tests were conducted to investigate annoyance of interior noise of high-speed trains. Based on the objective measure and subjective responses on interior noise, statistical analysis such as correlation and regression analyses were carried out. From the results perception models for evaluating the interior noise of high-speed train were derived.

A Study on Influence of High Pressure Hose on Automotive Power Steering Interior Noise Using Frequency Analysis (유압식 자동차 동력조향장치 고압호스가 실내소음에로 미치는 영향의 주파수 분석을 통한 연구)

  • 전승경;신재윤;황호준
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.2
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    • pp.108-115
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    • 2003
  • High pressure hose having tuning cables, called Resonator hose is frequently used to attenuate pressure ripple generated by the pump for reducing the vehicle interior noise. A number of studios have been conducted on the resonator hose and its analytical models. However, there are few studies which deal with the influence of resonator hose on vehicle interior noise because the most of studies were focused on transmission loss of the resonator hose. This paper presents NVH test results of power steering system and frequency analysis results. In the frequency analysis, both the relations between vibration, pressure ripple and vehicle interior noise and also the design parameters of high pressure hose influencing on vehicle Interior noise were discussed. The test was done for various high pressure hose specimens in full turn condition.

Analysis of Interior Noise Reduction in High Speed Trains by Filling up with Form (바닥 구조물의 폼재 충전을 통한 고속철도 차량의 실내 소음 저감 연구)

  • Kim, Tae-Min;Kim, Jeung-Tae;Kim, Jung-Soo;Kim, Seock-Hyun
    • Proceedings of the KSR Conference
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    • pp.663-669
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    • 2011
  • Since railway vehicle's improvements on speed and weight has caused interior noise, the passenger's convenience fell dramatically. Therefore many on-going researches are dedicated to reduce interior noise. In this study the analytical prediction of interior noise reduction has done through filling up the empty space using form and to modify the floor structure, which contributes highly with interior noises. Using Statistical Energy Analysis(SEA), the interior noise of the vehicles without the form filling on the floor structure and the vehicles with form filling and also a modified structure has been predicted. The selected percentage of form filling was 0, 50, 100% and through this research the analysis of noise reduction by form filling has been made. When floor structure has been filled with form, approximately 2 dB of noise reduction was observed and the difference of noise reduction level with 50 and 100% form filling was predicted to be very little. Through this study, the expectation of interior noise reduction in high speed trains is considered high.

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Analysis of Interior Noise for KTX Train using SEA (통계적 에너지 해석법을 이용한 KTX차량의 실내소음 해석)

  • Kim Jae-Chul;Lee Chan-Woo;Choi Sung-Hun
    • Proceedings of the KSR Conference
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    • pp.783-788
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    • 2004
  • Recently, Statistical Energy Analysis(SEA) is being increasingly applied to describe vibro-acoustic behavior of complex structures, such as air plane, automobile, ship, building. In this paper, we discuss the application of SEA to predict the interior noise for KTX train. To validate the SEA model of KTX train, calculated the interior noise for motorized car is compared to measured one. Finally, the reduction measures of interior noise for KTX are also discussed.

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Analysis of Interior Noise for KTX and KHST (KTX와 KHST의 실내소음 특성 분석)

  • Kim, Jae-Chul;Lee, Chan-Woo;Jo, Jun-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.450-453
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    • 2005
  • We test the running performance of KHST(Korean High Speed Train) that is developed in Korea. The interior noise of high speed train is dependent on the train speed generally and is one of the most important problem recently. In this paper, we present the test results of interior noise for KTX and KHST and examine into the cause of interior noise for KTX. From the analysis results, we know that the interior noise of KHST is lower about $2{\sim}5dB(A)$ than KTX and also the noise levels of KTX at 80Hz and 250Hz in tunnel increase very highly.

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A Study on Noise Characteristics of High Speed Trains (고속차량 소음원 특성에 관한 연구)

  • Koh, Hyo-In;Kim, Jae-Chul;Lee, Chan-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.992-995
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    • 2006
  • In this Paper the noise characteristics of KTX are analyzed in order to study the interior noise mechanism of KTX in slab tracks, which has become an issue since the commercial operating in 2004. The analysis of the interior noise of KTX in tunnel with concrete track shows sharply increased noise level in the range of 80Hz that is the natural frequency of the KIX carbody. The frequency characteristics of noise and acceleration levels of KTX in tunnels are compared to understand the interrelation between the noise inside the vehicle and outside the vehicle in the slat track tunnel. As a noise abatement method, the mud-flap was modified with intend to reduce the noise outside gangway and the interior noise inside the passenger compartment ultimately. The effect of this mud-flap modification on the interior noise is introduced and discussed.

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Source Separation Technique for Analysis of Internal Noise of Diesel Multiple Unit (디젤 동차의 실내 소음 분석을 위한 음원 분리 기법)

  • Lee Hwa-Soo;Kim Jong-Nyeun
    • Proceedings of the KSR Conference
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    • pp.789-792
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    • 2005
  • The dominant noise sources of Diesel Multiple Units are powerpack, which is composed of engine, transmission and cooling system, noise and wheel-rail rolling noise. The interior noise of a running vehicle is determined by structure-borne noise and air-borne noise from these noise sources. The contributions of interior noise from each noise source are calculated by air-borne transfer functions and structure-borne transfer functions of noise sources. In this paper, source separation technique is proposed to determine these transfer functions from the results of stationary and running tests of existing vehicle. With this technique, it is possible to get hold of contributions of interior noise from .noise sources of running vehicle. This source separation technique makes it possible to take efficient measures for reduction of interior noise at the early car-development stage.

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Sound Quality Characteristics for Interior Noise of High Speed Train (음질평가를 통한 고속철도 실내소음의 객관적.주관적 특성 분석)

  • Park, Buhm;Kim, Dong-Kyu;Jeon, Jin-Yong;Choi, Sung-Hoon;Park, Jun-Hong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.8
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    • pp.774-781
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    • 2010
  • In Korea, the high-speed train is one of the most important mass transportation. Due to its fast speed, the interior noise level is high and it is one of major reason for passenger complaints. In this study, the response of passengers to interior noise was evaluated using sound quality parameters. The effects of various parameters, such as train types, travel speed, rail road, on the calculated sound quality were investigated. The characteristics of interior noise were identified. The obtained results were compared to auditory experimental data. For precise comparison of noises of similar loudness but with different characteristics, paired comparison method was used. From the comparison, important parameters that have influence on the annoyance and loudness of the noise were determined.

The prediction of train interior noise with Statistical Energy Analysis (통계적 에너지 해석법을 이용한 전동차의 실내소음 분석)

  • Lee, Seoung-Woo;Kim, Jae-Chul;Lee, Dong-Hoon;Choo, Don-Ho
    • Proceedings of the KSR Conference
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    • pp.1413-1419
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    • 2008
  • As the improvements of service quality is becoming an important issue the, interior noise level of a train is an important factor of comfortable ride. To reduce the interior noise level, noise sources of the train need to be removed. However, in case with a structure of large scale and multiple noise sources, an estimation of influences of major noise sources, with indentification of its traveling paths needs to be performed. In current state, to improve the interior noise reduction, consideration of sound transmission loss of the train body prior to manufacturing is usually performed. In this study, the sound transmission loss of the train body of new model train of seoul metro's line no.2 under test opeation is measured and modeling of the train body is performed. And train interior noise is predicted using the measured values.

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An Application of the Statistical Energy Analysis for Absorbing and Soundproofing Materials of Vehicle (자동차용 흡.차음재의 성능분석을 위한 통계적 에너지 기법의 적용)

  • Lee, Chang-Myung;Lee, Jun;Kim, Dae-Gon
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.1
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    • pp.33-39
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    • 2003
  • Interior parts of a vehicle are getting important to reduce interior noise. Therefore, prior analysis of cabin noise related with interior parts are necessary at first design stage. Recently, Statistical Energy Analysis(SEA) has been suggested as a possible way for high frequency range noise analysis of interior parts. The validity of noise analysis with SEA to interior parts has been preyed by comparing with experimental result, and the developed method with SEA has been applied in finding optimized interior parts package.