• Title/Summary/Keyword: noise and vibration damper

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Design and Performance Evaluation of MR Damper for Integrated Isolation Mount (통합제진마운트용 MR 댐퍼의 설계 및 성능 평가)

  • Seong, Min-Sang;Lim, Seung-Gu;Choi, Seung-Bok;Kim, Cheol-Ho;Woo, Je-Kwan
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.11
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    • pp.1046-1051
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    • 2010
  • This paper presents design and performance evaluation of magnetorheological(MR) damper for integrated isolation mount. The MR damper needs two functions for the integrated isolation mount. The one is vibration absorption and the other is isolation of vibration transmission. For vibration absorption, the MR damper requires wide damping force range. And for isolation of vibration transmission, the friction of MR damper needs to be eliminated. In order to achieve this goal, a novel type of MR damper is originally designed in this work. Subsequently, the MR damper is mathematically modeled and its damping force characteristics are evaluated. In addition, the vibration control performance of the MR damper associated with the stage mass is evaluated. From the result, this paper evaluates the performance of MR damper for integrated isolation mount.

Study on a reduction of railway vibration using impact dampers (충돌 댐퍼를 이용한 레일 진동 저감 연구)

  • Yang, Wonseok;Ahn, Sangkeun;Koh, Hyoin;Park, Junhong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.119-120
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    • 2014
  • This study presents an development of impact damper and its application to reduction of railway vibration from moving roads. The impact damper for reducing trnsverse vibration from moving loads were designed and verified using simple dynamic model. To verify the performance of the impact damper, the vibration of a simplified beam with the impact damper was measured. The performance on reducing vibration for different clearance and mass ratio of the damper was investigated. The numerical solutions were verified using the experimental results from a simplified beam. The result can be utilized to reduce the rolling noise from high-speed trains.

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Optimum Design of Viscous Torsional Vibration Damper Using Random Tabu Search Method (Random Tabu 탐색법을 이용한 점성 비틀림 진동감쇠기의 최적설계)

  • 김유신;양보석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1996.10a
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    • pp.301-306
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    • 1996
  • A torsional damper is generally used to reduce the torsional vibration which occurs at a crankshaft of a multi-cylinder high speed diesel engine. Vibration amplitude should be estimate by the appropriate simulation model to determine the optimum specifications of damper. In this paper a new method which was based on the random tabu search method(RTSM) would be introduced for the viscous damper design to optimize the damping performance. The result was ascertained by comparing with conventional rubber damper.

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A Development of the Dynamic Absorber and Damper for Vibration and Noise Reduction of the Personal Computer (PC의 진동/소음 저감을 위한 쿨링홴의 동흡진장치 및 절연장치의 개발)

  • Jung, Won-Young;Lee, Kyu-Ho;Chung, Jin-Tai
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.21 no.4
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    • pp.339-345
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    • 2011
  • The purpose of this study is reduction the vibration of the personal computer by developing the vibration absorber and damper. The eccentricity of the cooling fan causes the vibration of the computer. We designed the material properties of the vibration absorber and damper by FEM model within operation frequencies of the cooling fan. We experiment the overall analysis and system analysis by using a laser vibrometer. The result shows that the proposed dynamic absorber and damper reduce the vibration of the personal computer.

Study of the Non-linearity of Cable Damper to Enhance Damping Performance of Stay Cable (사장교 케이블의 감쇠성능 향상을 위한 댐퍼의 비선형성 연구)

  • Seo, Ju-Won;Koh, Hyun-Moo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.9
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    • pp.785-796
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    • 2007
  • This study offers a design procedure of optimum cable damper for multi-mode vibration control with nonlinear damper and also investigates the relation between mode and amplitude dependency. The proposed multi-mode damping index, which is defined as a potential energy loss ratio of cable vibration, is a main component of optimization problem of optimum nonlinear damper. In order to include the amplitude dependency of nonlinear damper, three types of multi-mode patterns such as ambient vibration, support excitation and rain-wind induced vibration are assumed. The optimum damper exponent depends on amplitude patterns. In case of ambient vibration, optimum factor is less than 0.5 and in case of support excitation or rain-wind induced vibration it is between 0.5 and 1.0.

A Study on Vibration Control using Active Dynamics Damper with Linear Electric Motor (전자기력에 의한 능동 동흡진기의 진동제어성능에 관한 연구)

  • 고우식;박노길;노철웅;성기대;이인우
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1996.04a
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    • pp.163-168
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    • 1996
  • In this paper a new dynamic damper driven by DC linear electric motor, is proposed for suppressing wide-band vibration. First, the reason for the incapability of a conventional dynamic damper to suppress wide-band vibration is explained. Then, with its defects taken into consideration, the principle of wide-band vibration control is presented. Finally, experiments ar conducted verifying the control effect of the active dynamic damper for suppressing wide-band vibration.

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Study of the non-linearity of cable damper to enhance damping performance of stay cable (사장교 케이블의 감쇠성능 향상을 위한 댐퍼의 비선형성 연구)

  • Seo, Ju-Won;Koh, Hyun-Moo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.147-156
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    • 2007
  • This study offers a design procedure of optimum cable damper for multi-mode vibration control with nonlinear damper and also investigate the relation between mode and amplitude dependency. The proposed multi-mode damping index, which is defined as a energy loss ratio of cable potential, is a main component of optimization problem of optimum nonlinear damper. In order to include the amplitude dependency of nonlinear damper, it is assumed to exist three kinds of multi-mode patterns such as ambient vibration, support excitation and rain-win induced vibration. The optimum damper exponent depends on amplitude patterns. In case of ambient vibration, optimum factor is less than 0.5. In case of support excitation or rain-wind induced vibration is between 0.5 and 1.0. In this study, the effects of cable sag and inclination angle are included in the asymptotic design equation of damped cable structures.

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A Development of the Vibration Absorber and Damper for Vibration and Noise Reduction of the Computer (PC의 진동/소음 저감을 위한 쿨링팬의 동흡진장치 및 절연장치의 개발)

  • Chung, Jin-Tai;Jung, Won-Young;Lee, Kyu-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.370-375
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    • 2009
  • The purpose of this study is to reduce the vibration of the computer by developing the vibration absorber and damper. The eccentricity of the cooling fan causes the vibration of the computer. We designed the material properties of the vibration absorber by FEM model within operation frequencies of the cooling fan. We experiment the overall analysis and system analysis. The vibration of cooling fan is measured by using a laser vibrometer. The result shows that the proposed vibration absorber and damper reduce the vibration of the computer.

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A Study on the Variable Damper System for Vehicle Driveline (차량구동계용 가변 댐퍼시스템에 관한 연구)

  • Park Dong-Hoon;Choi Myung-Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.14 no.9 s.90
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    • pp.837-845
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    • 2004
  • A variable friction damper for vehicle driveline has been proposed. This new torsional damper system uses a solenoid as an actuator to vary friction force of the damper. To verify the idea of using a solenoid in a variable damper system, the test fixture and the dampers are made and tested. Also, to find out the range of damper friction forces that influence the vehicle driveline vibration, a mathematical model of the driveline had been developed and simulated. Test and simulation results show that, within electric current used in the vehicle electric system, the solenoid can develop enough friction force that will surpass resonance in the driveline of 1.5 L Gasoline engine vehicle during acceleration.

Experimental Study for Torsional Vibration Monitoring System Development of Diesel Engine (디젤엔진의 비틀림진동 모니터링 시스템 개발을 위한 실험적인 연구)

  • 이돈출;김상환;장석기
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11b
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    • pp.640-646
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    • 2001
  • The torsional vibration monitoring system(TVM) for large diesel engines was developed and applied by manufacturers of torsional vibration damper, flexible coupling and diesel engine since 1990s. And demands of TVM have been steadily increased to operate safely engine and to extend maintenance interval of damper and flexible coupling. In this paper, the experimental methods and algorithms of TVM development which used the existing PC, turning wheel and speed sensors in ship are introduced.

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