• Title/Summary/Keyword: Structure-borne noise

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Reduction of structure-borne noise from machineries including pumps (펌프류 장비의 고체음 저감에 관한 연구)

  • 김상렬;김현실;김재승;강현주;고성윤
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1998.04a
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    • pp.510-515
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    • 1998

  • Most of large structures such as ship, airplane, and so on have internal structure home noise sources. The operation of the machineries results in vibration and noise of the structure. Particularly, the vibration of the machineries is transmitted to the far place from the sources and emits noise into the water or outdoor as well as the inner space of the structure. In the case of warships this emission into the water induces noise to reduce the performance of its underwater acoustic equipment. Therefore the structure home noise levels of the installed machineries are strictly limited. This paper shows examples of structure home noise reduction from machineries including pumps.

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Analysis of Structure-Borne Noise in a Passenger Car During Idling (공회전 차량의 구조기인 소음해석)

  • 배병국;김광준
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1994.10a
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    • pp.132-137
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    • 1994

  • 본 연구에서는 공회전시 발생하는 승용차의 실내 소음에 대하여 각 소음원들의 특징과 실내소음에 기여하는 정도를 다중입력/단일출력 모형을 구성하므로써 기여도 및 부분 기여도 함수를 이용한 신호 처리 방법으로 소음원을 규명하였다.

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Evaluation of Design Variables to Improve Sound Radiation and Transmission Loss Performances of a Dash Panel Component of an Automotive Vehicle (방사소음 및 투과소음에 대한 승용차량 대시패널의 설계인자 별 영향도 분석)

  • Yoo, Ji-Woo;Chae, Ki-Sang;Park, Chul-Min;Suh, Jin-Kwan;Lee, Ki-Yong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.1
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    • pp.22-28
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    • 2012

  • While a dash panel component, close to passengers, plays a very important role to protect heat and noise from a power train, it is also a main path that transfers vibration energy and eventually radiates acoustic noise into the cavity. Therefore, it is important to provide optimal design schemes incorporating sound packages such as a dash isolation pad and a floor carpet, as well as structures. The present study is the extension of the previous investigation how design variables affect sound radiation, which was carried out using the simple plate and framed system. A novel FE-SEA hybrid simulation model is used for this study. The system taken into account is a dash panel component of a sedan vehicle, which includes front pillars, front side members, a dash panel and corresponding sound packages. Design variables such as panel thicknesses and sound packages are investigated how they are related to two main NVH indexes, sound radiation power(i.e. structure-borne) and sound transmission loss(i.e. air borne). In the viewpoint of obtaining better NVH performance, it is shown that these two indexes do not always result in same tendencies of improvement, which suggests that they should be dealt with independently and are also dependent on frequency regions.

  • https://doi.org/10.5050/KSNVE.2012.22.1.022 인용 PDF KSCI

Improved Design Process for Interior noise in Passenger Vehicles (자동차 실내소음을 위한 개선된 설계 프로세스)

  • Kim, Hyo-Sig;Kim, Heon-Hee;Yoon, Seong-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.974-979
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    • 2008

  • A design process for the structure-borne noise in a passenger vehicle is presented. The proposed process is improved from the previous one. The major difference between the current and last ones is that most of the countermeasures should be developed before fixing a tool for structural parts. This is requested for QCDP(Quality, Cost, Delivery and Productivity) by the design engineers. The proposed one consists of 4 steps: Problem definition, Cause analysis, Development of counter-measure and Validation. Based on the general rule: divide and conquer, the complex problem can be simplified into a few critical sub-systems through the first step: Problem definition. Secondly, the critical causes can be identified for the critical sub-systems through the second step: Cause analysis. Thirdly, effective countermeasures are investigated and produced through the third step: Countermeasure development. The proposed countermeasures are finally validated in the forth step: Validation.

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