• 제목/요약/키워드: dynamic vibration system

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감쇠진동계에 부착된 복합동흡진기의 효과에 관한 연구 (A Study on the Effects of Dual Dynamic Vibration Absorber for Damped Vibration System)

  • 안찬우;최석창;김동영
    • 소음진동
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    • 제7권6호
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    • pp.1039-1048
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    • 1997
  • This paper describes the effects of dual dynamic vibration absorbers attached to a primary vibration system with damping. The efficiency of dual dynamic vibration absorbers was investigated with the height of amplitude ratio at the resonance frequency ratio of the damped vibration system according to mass ratio, natural frequency ratio and damping ratio. The variation of amplitude ratio related to frequency ratio of primary vibration system is verified experimentally and theoretically according to dual dynamic vibration systems using computer program designed to find mutual relationship between two absorbers.

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

  • 안찬우;김동영;홍도관
    • 소음진동
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    • 제10권2호
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    • pp.325-330
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    • 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.

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차체의 동특성을 고려한 구동시스템의 진동모드 (Vibration Mode of the Drivesystem Considered the Vehicle Body's Dynamic Characteristics)

  • 유충준
    • 한국자동차공학회논문집
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    • 제12권2호
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    • pp.148-159
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    • 2004
  • This paper discusses vibration mode of the drivesystem considered the vehicle body's dynamic characteristics to study the influence of the vehicle body's dynamic characteristics on the vibration mode of the engine mount system and the ride quality of a vehicle. The simulation model consists of the engine mount system, the powertrain and the rigid or elastic vehicle body. Variables used in this study are the stiffnesses of an engine mount system and the excitation forces. The Goals of the study are analyzing both the vibration transmitted to the vehicle body including the drivesystem and the influence of the vehicle body's dynamic characteristics on the engine mount system. The mode of drivesystems with a rigid and a elastic vehicle body was compared. From the result of the forced vibration analysis for the drivesystem with a elastic vehicle body, it is shown that the vehicle body's dynamic characteristics influence on the engine mount system reciprocally.

반도체 초정밀장비의 진동허용규제치를 고려한 지지구조의 동특성 개선에 관한 연구 (A Study on the Structural Dynamic Modification of Sub-structure of Clean Room Considering Vibration Criteria)

  • 손성완;이홍기;백재호
    • 반도체디스플레이기술학회지
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    • 제2권2호
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    • pp.25-30
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    • 2003
  • In the case of a vibration sensitive equipment, it require a vibration free environment to provide its proper function. Especially, lithography and inspection device, which have sub-nanometer class high accuracy and resolution, have come to necessity for producing more improved Giga Class semi conductor wafers. This high technology equipments require very strict environmental vibration criteria in proportion to the accuracy of the manufacturing. In this paper, the dynamic analysis and modal test were performed to evaluate the dynamic properties of the constructing clean room structure. Based on these results, a structural dynamic modification(SDM) were required to satisfiy the vibration allowable limit for pression machine. Therefore, in order to improve the dynamic stiffness of clean room structure, the VSD system which can control the force applied on structure, were adopted and its utility were proved from dynamic test results of the improved structure after a modification work.

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

  • Ahn, C.W.;Park, S.C.;Lee, H.B.
    • 한국정밀공학회지
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    • 제13권12호
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    • pp.129-135
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    • 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.

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동흡진기를 사용한 광 디스크 드라이브의 진동저감 (Vibration Reduction of an Optical Disk Drive with a Dynamic Vibration Absorber)

  • 김남웅;신효철;김국원
    • 한국소음진동공학회논문집
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    • 제16권5호
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    • pp.529-536
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    • 2006
  • In high-speed optical disk drive, the excitation caused by rotation of a mass-unbalanced disk is a major source of vibration. The vibration can be a disturbance to the servo system, which is sufficient to cause severe failures in the reading and writing process. The vibration also causes users to feel unpleasantness. The vibration reduction is therefore essential for the reliable operation of optical disk drive. One of the approaches to reduce the vibration is a dynamic vibration absorber(DVA). In this paper, we analyze the dynamic behavior of $DVD{\pm}RW$ combo drive system with DVA through 12-dof rigid multi-body dynamic model. The effective location and the optimal frequency ratio for the DVA are obtained from the analysis. The DVA are fabricated based on the analysis and its usefulness is confirmed.

동흡진기를 채용한 광 디스크 드라이브의 동적 해석 (Dynamic Analysis of an Optical Disk Drive with Dynamic Vibration Absorber)

  • 김남웅;김국원;황효균;김동규;이진우;김외열
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 추계학술대회 논문집
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    • pp.867-870
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    • 2002
  • In high-speed optical disk drive, the excitation caused by rotation of a mass-unbalanced disk is a major source of vibration. The vibration can be a disturbance to the servo system, which is sufficient to cause severe failures in the reading and writing process. The vibration also causes users to feel unpleasantness. The vibration reduction is therefore essential for the reliable operation of optical disk drive. One of the approaches to reduce the vibration is a dynamic vibration absorber (DVA). In this paper, we analyze the dynamic behavior of $DVD\pmRW$ combo drive system with DVA through 12_dof rigid multi-body dynamic model. The effective location and the optimal frequency ratio are obtained from the analysis.

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

  • 윤정민;정운창;김진수;이유엽;오재응
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2014년도 추계학술대회 논문집
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    • pp.34-35
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    • 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.

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동강성계수의 전달을 이용한 축계의 비틀림진동 해석 (Torsional Vibration Analysis of Shaft System Using Transfer Dynamic Stiffness Coefficient)

  • 문덕홍;최명수;심재문
    • 동력기계공학회지
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    • 제1권1호
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    • pp.91-97
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    • 1997
  • Recently, it is increased by degrees to construct complex and large structures. In general, in order to solve the dynamic problem of these structures they have used finite element method(FEM). In this method, however, it is necessary to prove whether its results are correct or not. Therefore it requires much effort, time and many expenses for dynamic analysis of complex and large structures. Authors have developed the transfer dynamic stiffness coefficient method(TDSCM) which is the new vibration analysis method for complex and large structures on personal computer, and confirmed that the results of this method are good for these structures on personal computer. In this paper, TDSCM is applied to the torsional vibration analysis for the shaft system which consist of concentrated disks and shafts of continuous body. First, we formulate algorithms for torsional free and forced vibration analysis, and compare the results of TDSCM and FEM.

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웹기반 동적 설계 협업 지원 시스템 개발 (Development of a Web-based Vibration Analysis System for a Rotary Compressor)

  • 한형석;이재경
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1739-1742
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    • 2003
  • This paper introduces a Web-based vibration analysis system for rotary-type refrigerator compressors. Concern for vibration reduction in compressors has been growing for many years. What is important in vibration reduction is to easily predict the vibration without using a physical compressor. The dynamic model of the compressor is represented as a multi-body dynamic system. Solving the dynamic model is run on a high-performance server. The interfaces of the system are accessible via Web browsers, such as Netscape or Explorer. Anyone who wants to analyze the vibration of the rotary compressor or share the results data can access the system over the Internet regardless of their OS, platform. or location.

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