• Title/Summary/Keyword: Idle Vibration

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An Improvement in Idle Sound Quality of a V8 engine (V8 엔진을 탑재한 차량의 아이들링 시의 음질 개선)

  • Suh, In-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.193-198
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    • 2004
  • In order to keep the market competitiveness, it is desirable for automotive manufacturer to meet the customer's various aspects of requirements. The overall NVH (Noise, Vibration, and Harshness) performance has been an important measure when evaluating overall vehicle performance, product quality, and enhancing customers' loyalty to the product. The noise and vibration, while the engine is idling, has been brought particular attention to the drivers and passengers, because they encounter the operation conditions quite frequently without other masking noise sources: wind noise, road noise, and even powertrain radiated noise at higher speed driving. The specific noise, defined as 'CHIT' noise, has been identified as a potential customer issue, from the Pickup Truck with newly developed V8 powertrain. This paper describes the definition of the noise, identifying the potential sources, and noise radiation mechanisms, based on series of powertrain and vehicle test and verification processes. Then, based on the root-cause identified, the design change has been proposed and validated with several vehicles in order to have a complete satisfaction of the customer.

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The Study of the improvement of the sound quality using the target profile of combustion pressure (목적 연소압 형상을 이용한 음질 개선에 관한 연구)

  • Hwang, C.K.;Min, B.D.;Kim, I.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.649-653
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    • 2006
  • Engine Noise is composed of the mechanical and combustion noise. The contribution of combustion noise is generally bigger than the contribution of the mechanical noise at idle condition in DI diesel engine. That noise usually makes a roughness problem at the fundamental engine order. It is difficult to remove the modulation frequency so we have to directly reduce the combustion noise. The key effect of combustion noise reducing solution is the modification of the combustion pressure profile. It is accomplished by the multiple injection method and we solved the 400Hz combustion noise and improved the sound quality at idle condition in DI diesel engine.

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The Study of the Design and Control for the Hydrogen Recirculation Blower Noise and Vibration Reduction (수소 재순환 블로어 소음 진동 저감을 위한 설계 및 제어에 관한 연구)

  • Bae, Ho June;Ban, Hyeon Seok;Noh, Yong Gyu;Jang, Seok Yeong;Lee, Hyun Joon;Kim, Chi Myung;Park, Yong Sun
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.5
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    • pp.509-515
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    • 2014
  • At the fuel processing system (FPS) of fuel cell vehicle, hydrogen recirculation blower (HRB) is used for the recirculation of remained hydrogen after reaction. In this paper, noise and vibration improvement of HRB is studied by changing design and control. It is checked the campbell diagram and critical speed for stability of rotor, and housing stiffness is improved using simulation of frequency response function (FRF). A method is suggested that can decrease the unbalance amount of the rotor and impeller which main source of noise and vibration. In order to reduce the noise during deceleration of blower, electrical braking is applied and tested the risk impact of durability. Founded the optimum switching frequency of the motor control, and reduced the idle rpm by increasing of aerodynamic performance. The superiority of paper is proved by measurement of the improved product's noise and vibration.

Improvement Design Method for Vibration Reduction of Tractor Fender (트랙터 펜더의 진동저감을 위한 개선설계 방법)

  • Kim, Min Kyu;Kim, Won Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.5
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    • pp.584-593
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    • 2016
  • In this study, an improvement design method for reducing the vibration of fenders equipped in a tractor is proposed through the establishment of a finite element model and the topology optimization. As the original shapes of the parts cannot be altered, an improved design model was derived in which a stiffener was attached to the border of parts. Thus, the first resonance frequency was increased by approximately 16 Hz, which was confirmed to be the frequency interval for avoiding the idle and operating frequency of the engine. Finally the improved design model was applied to confirm the effect of vibration reduction. Therefore, it can be concluded that the improved design model of the tractor fender is effective at reducing vibrations of the tractor fender.

Optimal Design of Vehicle Engine Mount (차량 엔진마운트 최적 설계)

  • Kang, Koo-Tae;Won, Kwang-Min
    • Proceedings of the KSME Conference
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    • 2001.06c
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    • pp.361-368
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    • 2001
  • This paper introduces optimization techniques to design engine mount properties for passenger vehicle. The design targets are divided into three cases such as optimal positioning of powertrain modes, minimizing vibration of deriver's seat in idling and driving conditions. The proper models, mechanisms of vibration, and characteristics of optimization problems are discussed.

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