• Title/Summary/Keyword: Dynamic Vibration Absorber

Search Result 122, Processing Time 0.037 seconds

Vibration Reduction of Marine Air Compressor using Dynamic Vibration Absorber (동흡진기를 이용한 선박용 공기압축기의 진동저감)

  • Kim, Hyung-Jin;Hwang, Sang-Jae;Kim, Ue-Kan
    • Proceedings of the Korean Society of Marine Engineers Conference
    • /
    • 2006.06a
    • /
    • pp.35-36
    • /
    • 2006
  • This study is mainly concerned with vibration control of L-type reciprocating air compressor by a dynamic vibration absorber. The dynamic vibration absorber of reciprocating air compressor was designed for constant revolution running condition. For the review, Vibration test was conducted for the performance appraisal of installed dynamic vibration absorber in the reciprocating air compressor. As a result of the test, the performance of dynamic vibration absorber was satisfactory.

  • PDF

A Study on Optimal Multi-dynamic Absorber of Damped Linear Vibration System under the Harmonic Motion of the Base (기반의 조화운동을 받는 감쇠선형진동계의 최적 복합동흡진기에 관한 연구)

  • 안찬우;김동영;홍도관
    • Journal of KSNVE
    • /
    • v.10 no.2
    • /
    • pp.325-330
    • /
    • 2000
  • A dynamic absorber is used to protect the primary vibration system under the steady-state harmonic disturbance. In a number of cases it appears expedient to install several absorbers of smaller masses instead of one. This may be due to the need of distribute the absorber's response along the construction, restrictions on the absorber's installation. So, we studied characteristics of the primary vibration system for the optimal natural frequency ratio and the optimal damping ratio of serial multi-dynamic absorber. Also we obtained the optimum values of the serial multi-dynamic absorber parameters using computer simulation for the damped primary vibration system. In designing multi-dynamic absorber, we presented for the optimal natural frequency and the optimal damping ratio of multi-dynamic absorbers.

  • PDF

A Study on Vibration Reduction of an Optical Disk Drive with the Misaligned Axis of Rotation (회전축 정렬불량 광디스크 드라이브의 진동 저감에 관한 연구)

  • 강봉진;정태은;신효철;오주환
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.21 no.5
    • /
    • pp.122-130
    • /
    • 2004
  • In a high-speed and wide operating field optical disk drive, the vibration problem is one of the most important factors to be considered for reliable performance. And a disk misaligned with axis of rotation is a major source of vibration in optical disk drive. Furthermore, this vibration disturbance of the disk spindle system causes failure in the reading and writing process. So to solve this vibration problem, the vibration absorber using rubber mount has been introduced in recent years. In this paper, we have analyzed the simple optical disk drive model with dynamic vibration absorber through dynamic analysis of 12-dof by Recurdyn program and obtained optimal mass and frequency ratios of dynamic vibration absorber of dynamic vibration absorber and the optimal frequency ratio.

Preparatory Experiment on the Construct ion of Tunable Dynamic Absorber (가변 동흡진기 구축을 위한 예비 실험)

  • 박종훈;한상보
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.329-334
    • /
    • 2002
  • Preliminary test for the design and construction of a tuned dynamic absorber is a conducted. Proposed tuned dynamic absorber is a cantilevered beam type, and is supposed to adjust its natural frequency according to the changing operation condition of the primary system. The modal mass of the dynamic absorber is the easiest to control, therefore, the position of the attached mass of the dynamic absorber is considered as the main design parameter of the absorber. The effect of the dynamic absorber is experimentally verified under various operation conditions of the primary system.

  • PDF

Vibration Control of Membrane with Tension Gradient Using Multiple Dynamic Absorber (다중 동흡진기를 이용한 장력구배를 갖는 박판의 진동 제어)

  • Park, Chong-Hyun;Kim, Sung-Dae;Kim, Won-Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.15 no.5 s.98
    • /
    • pp.595-603
    • /
    • 2005
  • In this work, the multiple dynamic absorber( MDA ) is introduced to reduce several vibration modes of shadow mask simultaneously and its design method is developed from the theory of the simple dynamic absorber. When designing the dynamic absorber, there are three significant design parameters such as mass, damping ratio and tuning frequency. Therefore the sensitivity analysis for those parameters has been executed in order to find out the design criteria of multiple dynamic absorber using the finite element model of shadow mask. The multiple dynamic absorber(MDA) designed by the proposed method is tested theoretically and experimentally to estimate the efficiency of vibration reduction. From the results, it is verified that the method is feasible to apply the system having the multiple nitration modes and more efficient than the thin wire-type damper used commercially to reduce the vibration of shadow mask.

Dynamic Vibration Absorber Having Coil Springs and Oil Damper for a Damped Vibration System (감쇠진동계에 부착된 코일스프링과 오일댐퍼로 구성된 동흡진기)

  • Ahn, C.W.;Park, S.C.;Lee, H.B.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.13 no.12
    • /
    • pp.129-135
    • /
    • 1996
  • This paper presents the effectiveness of the dynamic vibration absorber consisting of a single mass, coil springs and oil damper on the resonance freauency ratio and amplitude ratio for damped linear systems, that is, primary vibration system with damping. The effects of the dynamic vibration absorber are investigated numerically and experimentally for values of mass ratio, natural frequency ratio, and damping ratio. The experimental results show good agreement with calculated ones. As a result, the characteristics shown by the present work are useful in optimal tuning the dynamic vibration absorber in practice.

  • PDF

Design of a Dynamic Absorber Using Permanent Magnet Force (영구자석의 자력을 이용한 동흡진기의 설계)

  • Son, Sol-San;Kim, Won-Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.20 no.11
    • /
    • pp.1064-1070
    • /
    • 2010
  • In this work, a dynamic absorber with a plate-type cantilever using magnetic force is proposed to reduce the vibration of a compressor directly. The dynamic absorber using magnetic force has some advantages of easily tuning the control frequency by adjusting the magnet spacing and obtaining wider control frequency band. The dynamic absorber is designed theoretically and tested experimentally to estimate the control frequency band. When the compressor is equipped with the dynamic absorber, the vibration of compressor and the noise level of refrigerator are reduced by 30 % and 3.2 dB respectively.

An Experimental Study onthe Endurance Characteristics of the Dynamic Absorber for Vibration Reduction of 4WD Vehicle's Powertrain (4륜구동 자동차의 동력기관에서 진동저감을 위한 동흡진기의 진동내구에 대한 실험적 연구)

  • 사종성;김찬묵
    • Journal of KSNVE
    • /
    • v.9 no.6
    • /
    • pp.1166-1172
    • /
    • 1999
  • This paper is the experimental study on the endurance characteristics of the dynamic absorber for the vibration reduction of the 4WD(4 Wheel drive) vehicle's powertrain. Employing the vehicle speed, natural frequencies of damper, modal testing results of powertrain and the weighting factor, the improved endurance test conditions are suggested to enlarge the life time of the dynamic absorber. The test results show that the life time of the dynamic absorber for Z-direction(up and down) has no problems, but the characteristics of X-direction (fore and after) will be sensitive to endurance characteristics of dynamic absorber.

  • PDF

Design of Distributed Mass Dynamic Vibration Absorber(DVA) for vibration reduction of Fixed-Fixed Beam (양단고정보에서 진동저감을 위한 분포질량 동흡진기의 설계)

  • Yoon, Jung-Min;Jeong, Un-chang;Kim, Jin-Su;Lee, You-Yub;Oh, Jae-Eung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2014.10a
    • /
    • pp.34-35
    • /
    • 2014
  • we designed a distributed mass dynamic vibration absorber for vibration reduction in a dual mode system. And we were subjected to evaluation of the vibration reduction performance of the distributed mass dynamic vibration absorber through experiments.

  • PDF

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
    • /
    • v.21 no.4
    • /
    • pp.339-345
    • /
    • 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.