• Title, Summary, Keyword: Interior noise

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Improvement of Interior Booming Noise in the Vehicle Using the Structural Dynamic Modification (구조물 동특성 변경을 이용한 실내 부밍 소음 개선)

  • Kim, Young-Ha;Lee, Jae-Woong;Kim, Sung-Gi
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.354-359
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    • 2012
  • Improvement of structure-borne noises in the vehicle compartments has been one of the primary concerns in the development of vehicles. The booming is an annoying low frequency interior noise and vibration in vehicle. But it is difficult to reduce the structure-born booming noise in traditional method - trial and error within the shorten development schedule. So in present, the structure dynamic modification (SDM) method helpful to predict the effect of the local mass, stiffness, and damping is introduced. So in order to reduce the interior booming noise, the SDM was performed, and verified with modal test result. It was shown that the interior booming noise was reduced as predicted.

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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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Identification of the Interior Noise Generated by SUV Axle and Modification of the Structural on Axle System for Noise Reduction (SUV용 액슬의 소음원 규명 및 소음 저감을 위한 액슬의 구조변경에 관한 연구)

  • Lee, Ju-Young;Jo, Yoon-Kyeong;Kim, Jong-Youn;Lee, Sang-Kwon
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.16 no.6
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    • pp.582-592
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    • 2006
  • This paper presents experimental and analytic methods to reduce interior noise generated by car axle. The test vehicle has a whine noise problem at passenger seats. In order to identify transfer path of interior axle noise, the vibration path analysis, the modal analysis and running modal analysis are systematically employed. By using these various methods, it has been founded that the interior noise generated by car axle was air borne noise. To reduce and predict axle noise, various structural modifications are performed by using FEM and BEM techniques, respectively. Through the modification of the axle structure, the air borne noise of the axle was reduced 3$\sim$4 dBA level.

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

  • Jeong, Hyuk;Ih, Jeong-Guon
    • Journal of KSNVE
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    • v.6 no.4
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    • pp.499-502
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    • 1996
  • Interior noise, engine speed and vehicle speed are measured under transient 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 metrics such as the loudness, sharpness and articulation index at each vehicle speed can be estimated and characteristics of interior noise for various running modes can be discussed in the viewpoint of noise quality.

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A Study of Interior Noise Reduction through In-Vehicle Measurement Test to the Windshield Wiper Motor System (차량용 윈드쉴드 와이퍼 모터의 단품 및 실차시험을 통한 소음 저감 연구)

  • 최창환;임상규
    • Journal of KSNVE
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    • v.8 no.5
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    • pp.862-869
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    • 1998
  • The interior noise generated by the windshield wiper system including a wiper motor, the motor mountings and linkages is considered as a structure-borne noise. The structureborne noise is closely related with the system vibration which was transmitted into interior cabin through the car body. In this study, the frequency characteristics of vibration in the wiper motor system were first identified through the frequency analysis. Then effects of the wiper motor mountings and linkages on the vehicle interior noise were studied through in-vehicle measurements. Finally a possibility of noise reduction at a certain frequency was revealed from the study.

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Reducing the Interior Noise of the Korean High-speed Train Using Geometric Acoustic Method (기하음향 기법을 적용한 한국형 고속철도 실내소음 저감 방안)

  • Kim, Kwan-Ju;Park, Jin-Kyu
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.12 no.6
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    • pp.431-436
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    • 2002
  • The interior sound pressure level of the Korean high-speed train(KHST) is predicted by geometrical acoustic method. For the Purpose of assuring the prediction of Interior noise of KHST by the geometrical acoustic scheme, calculated sound level values of the Korean train express(KTX) by Identical geometrical method are compared with measured values of KTX prototype vehicle by experiment. Contribution of individual sound source of KHST vehicle Into the interior response positions is calculated and sound sources are classified in influential order. Hence, it is reasonable approach to reduce sound power of most contributing noise source first. Sensitivity of the interior response position's sound pressure level (SPL) with respect to train wall sections' transmission loss are carried on and acoustically sensitive spot is identified, for example window area for passenger cabin case. Those contribution and sensitivity analysis results are suggested to design quieter train efficiently.

Noise Characteristics of the HVAC System of Korea High Speed Train (한국형 고속전철 공조시스템 소음에 관한 연구)

  • 하인수;박철희;이우식;한기흥
    • Proceedings of the KSR Conference
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    • pp.379-387
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    • 1998
  • HVAC systems are used to maintain comfort conditions in occupied spaces. Like rolling noise and aerodynamic noise, noise from the HVAC system of train increases interior noise level. For an appropriate interior noise level, it is necessary not to find noise sources and their propagation paths. Noise emission from the sources and propagation through the propagation paths should be regulated in order to reduce their effect to the interior noise level. In general, the main noise source in the HVAC system is blower which operates at high static pressure. This noise propagates through ducts which are directly connected to the residential area. Since the blower noise can be reduced only to some degree, it is necessary for the propagation paths to have enough noise attenuation. Acoustic properties of ducts are usually found by experimental methods but it is rather difficult and expensive to set up such test equipments. In this thesis, the design and the noise characteristics of TGV-K HVAC system are studied. Finite element method in accordance with experimental method is used to study the acoustic properties of TGV-K duct system.

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Noise Source Identification of Electric Parking Brake by Using Noise Contribution Analysis and Identifying Resonance of Vehicle System (차량 시스템의 소음 기여도분석 및 공진 규명을 통한 전자식 주차 브레이크 소음원 규명)

  • Park, Goon-Dong;Seo, Bum-June;Yang, In-Hyung;Jeong, Jae-Eun;Oh, Jae-Eung;Lee, Jung-Youn
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.3
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    • pp.119-125
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    • 2012
  • Caliper intergrated Electric Parking Brake (EPB) is an automatic parking brake system, attached to rear caliper. Because EPB uses luxury vehicles recently, the drivers of vehicles are sensitive to the EPB noise. EPB is operated by the motor and gear, so noise is generated by motor and gear. In order to reduce noise, One of EPB manufacturers uses helical gear and changes the shape of EPB housing. But these methods are not optimized for reduction of interior noise. There are many noise transfer paths into vehicle interior and it is difficult to identify the noise sources. Therefore, in this study, we performed contribution analysis and modal testing in the vehicle system. It is possible to distinguish between air-borne noise and structure-borne noise in the vehicle interior noise by comparing interior noise peak with resonance mode map.

Improvement of Sound Quality of Vehicle Through Reduction of Interior Noise Using Noise Transfer Path Analysis and Running Modal Analysis (소음 전달 결로 해석 및 주행 모두 해석을 이용한 차량의 실내소음 저감을 통한 음색 향상)

  • 이상권;황우석;김중희;우재학;이상희;이학준
    • Journal of KSNVE
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    • v.10 no.5
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    • pp.806-810
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    • 2000
  • This paper presents a practical method for reduction of interior noise and improvement of sound quality in compartment of passenger car. The tested vehicle has a booming noise problem at rear passenger seats. In order to identify the transfer path of interior noise, the running modal analysis, the vibro-acoustic frequency transfer response and the noise path analysis are systematically employed. Using these various methods, it has been founded that the rear part of the roof of the test car was a noise source for the booming noise. Through the modification of the roof, the booming noise has been reduced and sound quality inside car also has been improved.

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