• Title/Summary/Keyword: NVH

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Engine Mounting System Optimization for Improve NVH (NVH 향상을 위한 엔진 설치 시스템 최적화)

  • Kim, Jang-Su
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.10
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    • pp.4665-4671
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    • 2013
  • Engine mounting system is the most responsible system for NVH performance of vehicle. The vibration at idle shake, road shake, Key ON/OFF, gear shift tuned by the engine mount position and stiffness. Previously described Engine mounting system theory investigated and summarized in this paper. Decoupling of the Power train rigid mode and Reducing the angle between Torque-Roll-Axis and Elastic-roll-Axis is starting point of optimization. Multi-optimization analysis was performed because of variety simulation case and FE-model. Eventually, Find the best mount location and the stiffness has improved the performance of the vehicle NVH.

자동차의 소음.진동 개발 방향

  • Park, Dong-Cheol
    • Journal of the KSME
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    • v.53 no.2
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    • pp.40-43
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    • 2013
  • 이 글에서는 차량 개발에 있어서의 소음 진동 관련 주요 이슈 사항인 개발 환경 변화에 따른 NVH 대응기술, 능동제어 활용기술, 친환경차량의 NVH 개발, 그리고 Virtual NVH 개발 환경에 대해 살펴 보고, NVH 연구개발 방향을 제안하였다.

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자동차의 부밍 소음 저감

  • 정해일
    • Journal of KSNVE
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    • v.6 no.2
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    • pp.127-133
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    • 1996
  • 이 글에서는 부밍소음의 현상과 특성, 발생 메카니즘, 원인규명 방법 및 대책 방법에 대해 알아보았다. 개발 차량이 제작되고 나서 양산 단계까지의 NVH (Noise, Vibration and Harshness) 육성에 초점을 두어 트러블슈팅(troubleshooting) 위주로 서술 하였으나, 이단계에서 NVH 대책을 세우는 것은 시간이 오래 걸릴 뿐 아니라 대책안 적용에 소요되는 비용도 문제가 될 수 있다. NVH 성능이 우수한 차량 을 조기에 개발하기 위해서는 NVH가 고려된 설계가 필수적이다. 설계 단계에서 CAE 해석을 하여 NVH 성능을 미리 예측하고, 설계 미스가 있을 때는 차량이 제작되기 전에 미리 대책을 세움으로써 효율적인 차량 개발을 할 수 있다.

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Study of TPA for cascading NVH target of electric parking brake (전자식 주차 브레이크 작동소음 개발 목표 설정을 위한 전달경로분석법의 적합성 연구)

  • Jung, Hyun Bum;Lee, Jae Yong;Han, Min Gyu;Jeon, Namil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2013.10a
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    • pp.94-98
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    • 2013
  • Transfer Path Analysis (TPA) is commonly used, by car makers and parts suppliers, analysis process to root the cause of NVH problems. In general, TPA is an analyzing technique to find the contributing factors of noise/vibration problems, and their transfer path in vehicle. However, not only TPA is used to analyze the source of NVH problems but also is used to predict NVH performance prior to the proto vehicle, or to set the development target for next new vehicle. Automotive parts manufacturing companies have to set NVH performance target when developing new systems just as car makers have NVH target set for new vehicle. Nevertheless, most of components are currently being developed based on subjective evaluation without an objective target. To judge the suitability of using TPA to set NVH target of electric parking brake, this research analyzed the transfer path by setting them in two points of view; Chassis Module and Electric Parking Brake, and comparing the measured value and calculated value. From this result, NVH target of electric parking brake will be approached in level of vehicle, system and component.

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The Dynamics of Noise and Vibration Engineering Vibrant as ever, for years to come

  • Leuridan, Jan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2010.05a
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    • pp.47-47
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    • 2010
  • Over the past 20 years, constant progress in noise and vibration (NVH) engineering has enabled to constantly advance quality and comfort of operation and use of really any products - from automobiles to aircraft, to all kinds of industrial vehicles and machines - to the extend that for many products, supreme NVH performance has becomes part of its brand image in the market. At the same time, the product innovation agenda in the automotive, aircraft and really many other industries, has been extended very much in recent years by meeting ever more strict environmental regulations. Like in the automotive industry, the drive towards meeting emission and CO2 targets leads to very much accelerated adoption of new powertrain concepts (downsizing of ICE, hybrid-electrical...), and to new vehicle architectures and the application of new materials to reduce weight, which bring new challenges for not only maintaining but further improving NVH performance. This drives for innovation in NVH engineering, so as to succeed in meeting a product brand performance for NVH, while as the same time satisfying eco-constraints. Product innovation has also become increasingly dependent on the adoption of electronics and software, which drives for new solutions for NVH engineering that can be applied for NVH performance optimization of mechatronic products. Finally, relentless pressure to shorten time to market while maintaining overall product quality and reliability, mandates that the practice and solutions for NVH engineering can be optimally applied in all phases of product development. The presentation will first review the afore trends for product and process innovation, and discuss the challenges they represent for NVH engineering. Next, the presentation discusses new solutions for NVH engineering of products, so as to meet target brand values, while at the same time meeting ever more strict eco constraints, and this within a context of increasing adoption of electronics and controls to drive product innovation. NVH being very much defined by system level performance, these solutions implement the approach of "Model Based System Engineering" to increase the impact of system level analysis for NVH in all phases of product development: - At the Concept Phase, to be able to do business case analysis of new product concepts; to arrive at an optimized and robust product architecture (e.g. to hybrid powertrain lay-out, to optimize fuel economy); to enable target cascading, to subsystem and component level. - In Development Phase, to increase realism and productivity of simulation, so as to frontload virtual validation of components and subsystems and to further reduce reliance on physical testing. - During the final System Testing Phase, to enable subsystem testing by a combination of physical testing and simulation: using simulation models to simulate the final integration context when testing a subsystem, enabling to frontload subsystem testing before final system integration is possible. - To interconnect Mechanical, Electronical and Controls engineering, in all phases of development, by supporting model driven controls engineering (MIL, SIL, HIL). Finally, the presentation reviews examples of how LMS is implementing such new applications for NVH engineering with lead customers in Europe, Asia and US, with demonstrated benefits both in terms of shortening development cycles, and/or enabling a simulation based approach to reduce reliance on physical testing.

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An Experimental Approach and Improvement of Buzz, Squeak and Rattle Noise from a Seat (차량 시트의 BSR Noise에 대한 시험적 고찰 및 개선)

  • Jeon, Jun-Sig;Kim, Byung-Hoon;Bang, Byung-Ju;Jang, Ik-Guen;Ji, Sung-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.675-679
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    • 2006
  • Today, the interior noise perceived by the occupants is an important factor in the design of automotive interior assemblies. Buzz, Squeak and Rattle Noises in a Seats are one of the major concerns mentioned above. In this study, the terms 'Buzz, squeak and rattle' were defined as the noise originating from structural vibrations in an assembly. And, the BSR noise of vehicle seat was investigated and the improvement of BSR noise level was confirmed though the structural treatment based on the structural analysis results from the modal and sound intensity of seat.

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Vehicle NVH Development Process (NVH 개발 프로세스)

  • Leuridan, Jan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2010.05a
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    • pp.348-348
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    • 2010
  • 신 차종의 개발 시, 기존 차량 모델을 사용하여 재 설계하는 방식에 의해 전례 없이 빠르게 차량 개발을 수행하고 있다. 또한 대부분의 이들 후속 차량은 공통 플렛폼 상에 설계되고 있으며, 일반적으로 충격, 구조 건전성, 생산 타당성 검토 등의 컴퓨터 시뮬레이션은 개발 프로세서 초기 단계에서 행하여 지고 있으나. NVH 엔지니어링은 차량 개발 프로세스의 매우 중요한 과정으로 되어 있음에도 불구하고, 실내 소음, 진동 승차감, 피로 수명 예측 등은 사용되는 해석 모델의 크기 및 복잡성으로 인하여 이들 성능 특성 평가 및 최적화는 아직 도전 과제이며, 본 논문에서는 몇몇 선진 OEM에서 수행되고 있는 NVH 개발 프로세스와 이를 가능케 하는 기법을 소개한다.

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