• Title, Summary, Keyword: Damper

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Numerically Analytical Design of An Orifice Fluid Damper (오리피스 유체댐퍼의 수치해석적 설계)

  • 이재천;김성훈;문석준
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.6
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    • pp.105-112
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    • 2003
  • This paper presents the numerical design technology of a passive orifice fluid damper system especially for the characteristics between the damper piston velocity and the damping force. Numerical analysis with the visual interfacial modeling technique was applied into the analysis of the damper system's dynamics. A prototype orifice fluid damper was manufactured and experimentally tested to validate the numerical simulation results. The performances of various damper system schemes were investigated based on the verified numerical simulation model of orifice fluid damper.

Vibration Suppression Using Eddy Current Damper (와전류 감쇠기를 이용한 진동 억제)

  • Kwak, Moon-Kyu;Lee, Myeong-Il;Heo, Seok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.10
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    • pp.760-766
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    • 2003
  • This paper is concerned with the eddy current damper which can be used to enhance the damping of the host structure. The operating principle of the eddy current damper is first explained in detail. The dynamic interaction between the magnets and the copper plate produces eddy current thus resulting in the damping force. By attaching the eddy current damper to the host structure, the damping of the total structure can be increased so that vibrations can be suppressed. The advantage of the eddy current damper is that it doesn't require any electronic devices and power supply The effect of the eddy current damper on the global dynamic characteristics of the structure is investigated by considering the cantilever with the eddy current damper. Experimental results show that the eddy current damper is an effective device for vibration suppression.

Vibration Suppression Using Eddy Current Damper (와전류 감쇠기를 이용한 진동 억제)

  • Kwak, Moon-K;Lee, Myeong-Il;Heo, Seok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.136-141
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    • 2003
  • This paper is concerned with the eddy current damper which can be used to enhance the damping of the host structure. The operating principle of the eddy current damper is first explained in detail. The dynamic interaction between the magnets and the copper plate produces eddy current thus resulting in the damping force. By attaching the eddy current damper to the host structure, the damping of the total structure can be increased so that vibrations can be suppressed. The advantage of the eddy current damper is that it doesn't require any electronic devices and power supply. The effect of the eddy current damper on the global dynamic characteristics of the structure is investigated by considering the cantilever with the eddy current damper. Experimental results show that the eddy current damper is an effective device for vibration suppression.

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Damping Force Characteristics of ER Damper Considering Hysteresis (ER 댐퍼의 이력현상을 고려한 댐핑력 특성 고찰)

  • 홍성룡;송현정;한상수;최승복
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.489-494
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    • 2002
  • This paper presents hydraulic model which can capture the hysteric damping force behavior of ER damper. A flow mode rue ER damper is manufactured, and its field-dependent damping forces are measured. Newly proposed hydraulic model which derived from physical hydro-mechanical parameters of ER damper are conventional Bingham model are investigated to represent the field-dependent damping force characteristics of ER damper. After principal parameters of two models are estimated from the measured damping forces data, the force vs velocity hysteresis cycles are then reconstructed. The results show that the proposed hydraulic model can capture the hysteresis behavior of ER damper accurately.

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Performance Characteristics of Seat Damper Using MR Fluid (MR 유체를 이용한 운전석 댐퍼의 성능특성)

  • 남무호
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.9 no.5
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    • pp.127-134
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    • 2000
  • This paper presents the development of a semi-active seat damper using MR fluids and the performance analysis of seat suspension system with a MR seat damper. An annular orifice type MR seat damper is proposed for a seat suspension of a commercial vehicle. After formulating the governing equation of motion, then an appropriate size of the seat damper is designed and manufactured. Following the evaluation of field-dependant damping force characteristics, the controllability of the damping force is experimentally demonstrated in time domain by adopting PID controller. A semi-active seat suspension with the proposed MR damper is constructed and its dynamic model is established. Subsequently, vibration control capability of the semi-active suspension system is investigated by employing the sky-hook controller.

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Performance Evaluation of a Semi-Active ER Damper with Free Piston and Spring (부동피스톤과 스프링을 갖는 반능동 ER댐퍼의 성능평가)

  • Choe, Seung-Bok;Kim, Wan-Gi
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.3
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    • pp.691-700
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    • 2000
  • This paper presents a novel type of a semiactive damper featuring an electro-rheological(ER) fluid. Unlike conventional cylindrical ER damper, the proposed one has controllable orifices by the intensity of electric fields (We call it orifice type). The dynamic model of the orifice type ER damper is formulated by incorporating field-dependent Bingham properties of an arabic gum-based ER fluid. Design parameters such as electrode gap are subsequently determined on the basis of the dynamic model. After manufacturing the orifice type ER damper, field-dependent damping forces and damping force controllability are empirically evaluated. In the evaluation procedure, conventional cylindrical ER damper is adopted and its performance characteristics are compared with those of the orifice type ER damper. In addition, the proposed one is installed with a full-car model and its vibration control performance associated with a skyhook controller is investigated.

A Study on the Torsional Vibration Damper of the Small Internal Combustion Engine Driving System(Part I) - Development of the Optimum Viscous-Rubber Damper- (소형내연기관축계의 비틀림진동댐퍼에 관한 연구 제1보 최적점성.고무탄성댐퍼의 개발)

  • 전효중;김유종;김의간;김동혁
    • Journal of Advanced Marine Engineering and Technology
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    • v.15 no.2
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    • pp.44-52
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    • 1991
  • The crankshaft system of engine is a complex vibratory object and its vibration modes are consisted of torsional, axial and their coupled vibration. Among them, the torsional vibration causes engine noise as well as serious fatigue faillures of crankshaft. If the troules of noises and crankshaft strength are forecasted by torsional vibration calculation in the design atage of crankshaft, the torsional damper is adopted as the final countermeasure. In this paper, some computer program to calculate crankshaft torsional vibration of engine are developed and with developed programs, an efficient rubber-viscous damper for automobile and with developed programs, an efficient rubber-viscous damper for automobile engine is designed and manufactured, and then it is fitted on the actual automobile engine to confirm its calculated efficiency. By comparing the measured result (with damper and without damper) with the calculated one, the reliability of developed computer programs and the performances of manufactured damper are confirmed.

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Mechanical Characteristics Analysis of Coil Spring & Viscous Damper System (Coil Spring & Viscose Damper System의 동적거동특성분석)

  • Kim, Min-Kyu;Choun, Young-Sun
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.471-478
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    • 2006
  • This paper presents the results of experimental studies of the mechanical characteristics of the Coil Spring and Viscous Damper system. The Coil Spring and Viscous Damper systems were selected for the isolation of Emergency Diesel Generator (EDG) which is located in Nuclear Power Plant (NPP). The Coil Spring and Viscous Damper systems were developed for, the operating vibration isolation and seismic isolation for scaled Model EDG System. The damping properties of the viscous damper changes as the variation of velocity. As a results, nonlinear damping characteristics of viscous damper system were evaluated.

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Comparison of Performances refer to Magnetic and Fluid Analysis of Magneto-Rheological Flow Damper (자기점성유체 댐퍼의 자기장 및 유동 해석에 따른 성능비교)

  • Song, Jun-Han;Son, Sung-Wan;Lee, Gyu-Seop;Chun, Chong-Keun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.98-102
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    • 2009
  • The magneto-rheological fluid expresses different cohesiveness according to the strength of the external electric current. To manufacture the magneto-rheological fluid damper that uses such characteristics of the fluid, a flow analysis of the inner damper was conducted to forecast the damper's capacity. In addition, using the finite element method software, analysis on the characteristics of electromagnetic field around the coil operation unit inside the damper. Based on the result of the analysis, a single core damper and a double core damper were built and tested for their dynamic function. Based on the result of the experiment, the propriety of the flow analysis was demonstrated, and the proposed model was verified.

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Experimental research of dynamic behaviors at viscoelastic damper with change of orifice (점탄성 감쇠기의 간극 변화에 따른 동특성에 대한 실험적 연구)

  • Yun, Jong-Min;Lim, Sang-Hyuk;Park, Hwa-Yong;Kim, Chang-Yeol;Lee, Jae-Eung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.744-749
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    • 2011
  • Silicon oil in viscous fluid damper has a viscoelastic feature that show stiffness besides damping. These properties depend on frequency and are non-linear. A lot of research has been conducted in order to identify viscoelastic damper with mathematical model. Fractional Derivative Maxwell Model has been widely used, but this model did not explain the effect of damper size change on the damper performance. In this paper, the experimental study was conducted to validate damper's dynamic behaviors when total damper's size is changed while maintaining same aspect ratio and orifice size.

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