• Title, Summary, Keyword: Vehicle interior noise

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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.

Objective Evaluation of Vehicle Interior Noise in Operation (주행중 차실 내부 소음의 평가)

  • Jeong, Hyuk;Ih, Jeong-Guon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.47-52
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    • 1996
  • Interior noise, engine speed and vehicle speed are measured under road-load condition and interior noise signal is transformed by using the transient signal analysis methods such as the spectrogram and wavelet transform. Using the analyzed results, subjective noise criteria such as the loudness, noisiness and articulation index at each vehicle speed can be estimated and characteristics of interior noise for various running mode can be discussed in the viewpoint of noise quality.

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The Standardization of Sound Quality Evaluation Method for the Vehicle Interior Noise (차량 실내 소음에 대한 음질 평가 방법의 표준화)

  • Park, Sang-Gil;Lee, Hae-Jin;Bae, Chul-Yong;Lee, Bong-Hyun;Oh, Jae-Eung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.12
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    • pp.1230-1237
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    • 2007
  • The vehicle noise is classified into interior and radiated exterior noise. And it influences on consumer's vehicle decision and traffic noise environment very much. In case of the vehicle exterior noise, it is related with traffic noise and in case of the interior noise, it is related with driver's and passenger's sensitivity quality. Because these influenced on drivers and traffic environment, so standards are restricted by the laws and regulated for the measurement. But, the existence standards measuring the only sound pressure level are limit to reflect consumer's sensitive aspects. Therefore in this study, the recent standards and laws were searched about domestic and abroad papers and the testing mode for the sound quality(SQ) evaluation was constructed about the vehicle interior noise. Finally, we aimed at the standard establishment to evaluate the vehicle interior SQ using statistics method.

The Standardization of Sound Quality evaluation method for the vehicle interior noise (차량 실내 소음에 대한 음질 평가 방법의 표준화)

  • Park, Sang-Gil;Kim, Ho-San;Oh, Jae-Eung;Bae, Chul-Yong;Lee, Bong-Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.303-310
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    • 2007
  • The vehicle noise is classified into interior and radiated exterior noise. And it influences on consumer‘s vehicle decision and traffic noise environment very much. In case of the vehicle exterior noise, it is related with traffic noise and in case of the interior noise, it is related with driver’s and passenger‘s sensitivity quality. Because these influenced on drivers and traffic environment, so standards are restricted by the laws and regulated for the measurement. But, the existence standards measuring the only sound pressure level are limit to reflect consumer’s sensitive aspects. Therefore in this study, the recent standards and laws were searched about domestic and abroad papers and the testing mode for the sound quality (SQ) evaluation was constructed about the vehicle interior noise. Finally, we aimed at the standard establishment to evaluate the vehicle interior SQ using statistics method.

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The Analysis of Vehicle Interior Noise by the Powertrain, and Measurement of Noise Trasnsfer Function using Vibro-Acoustic Reciprocity (파워트레인에 의한 차량 실내 소음 특성 및 전달 함수 측정)

  • Kim, Sung-Jong;Lee, Sang-Kwon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.501-506
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    • 2007
  • Structure-borne noise is the interior noise that results from the low frequency vibrational energy transmitted through those body and joint parts. The relation between the excitation of powertrain and resultant interior sound must be analyzed in order to identify and predict the structure borne noise. The method of acoustic source excitation is preferred than the method of mechanical force excitation to measure the NTF(noise transfer function). Because acoustical method is more convenient and reliable. In this paper, to analysis and identify vehicle interior noise by powertrain is performed, and the vibro-acoustic transfer function is extracted from experimental measurement. These are important step of TPA(transfer path analysis) to identify effect of interior noise resulted from powertrain running excitation.

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

  • Jeon, S.G.;Shin, J.Y.;Hwang, H.J.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.51-56
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    • 2002
  • 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 studies 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 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.

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Interior noise of a KTX vehicle in a tunnel (KTX 차량의 터널 통과 시 소음특성)

  • Choi, Sung-Hoon;Kim, Jae-Chul;Lee, Chan-Woo;Cho, Jun-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.49-52
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    • 2004
  • High-speed trains with the maximum speed of 300 km/h have started revenue services since April 2004. A large portion of the 'Kyung-Bu' line is comprised of tunnels or bridges, which may cause excessive noise in a vehicle. The vibration generated by the trains propagates into the structure of the tunnel and the vehicle and it can be radiated as noise inside the vehicle interior. This noise can usually be heard as low frequency structure-borne noise. Measurement of the noise and vibration inside the KTX vehicle confirmed that the noise comprises of frequencies below 250 Hz with a couple of broad peaks.

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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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Analysis and Evaluation of Interior Noise for KTX Passenger car in the Conventional line (기존선 구간에서의 KTX 객차 실내소음 평가 및 분석)

  • Lee Chan-Woo;Kim Jae-Chul
    • Proceedings of the KSR Conference
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    • pp.675-678
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    • 2004
  • Comparative analysis it did the interior noise of the KTX vehicle and the P-P Semaeul vehicle from the conventional line Homan Seodaejeon-Hanam section from the research which it sees. The test result KTX vehicle appeared when the P-P Semaeul vehicle compared to 20 - 25 KM/H speed up operating commerce operation speed even, the standard values 66 dBA the lowers 55 - 62 dBA. P-P Semaeul vehicle interior noise of the identical test section 63 dBA it will compare and there is a possibility the KTX vehicle knowing from the existing line operating hour interior noise.

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What are measures to reduce interior noise for KTX in tunnel with concrete track? (콘크리트 궤도 터널 주행 시 KTX차량의 실내소음 저감방안은 무엇인가?)

  • Kim J.C.;Koh H.I.;Lee C.W.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.29-30
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    • 2006
  • The interior noise of KTX in tunnel has become an issue since the commercial operating in April 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 KTX carbody. We know that the booming noise inside KTX in tunnel with concrete track is generated by noise outside gangway and rolling noise at the carbody natural frequency. In this Study noise reduction methods are discussed on the basis of the comparison of the KTX and KHST noise characteristics. Alternatively, the effect of the modified mud-flap on the interior noise is introduced.

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