• Title, Summary, Keyword: MR댐퍼

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Design and Performance Evaluation of MR Damper for the Reducing Vibration of a Flexible Pipe Conveying Fluid (유체유동에 의한 유연한 파이프의 진동 저감을 위한 파이프 지지용 MR댐퍼의 설계 및 성능 평가)

  • Park, Woo-Cheul;Lee, Hyun-Chang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.5
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    • pp.2100-2105
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    • 2013
  • This paper presents design and performance evaluation of MR damper for the reducing vibration of a flexible pipe conveying fluid. A novel type of MR damper which is suitable for pipe vibration characteristics is proposed and the MR damper is mathematically modeled and its damping force characteristics are evaluated. The vibration control performance of the MR damper associated with The cantilever pipe system is evaluated.

Fuzzy Sky-hook Control of Semi-active Suspension System Using Rotary MR Damper (회전형 MR 댐퍼를 이용한 반능동 현가장치의 퍼지 스카이-훅 제어)

  • Cho, Jeong-Mok;Joh, Joong-Seon
    • Journal of Korean Institute of Intelligent Systems
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    • v.17 no.5
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    • pp.701-706
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    • 2007
  • Recently, a number of researches about linear magnetorheological(MR) damper using valve-mode characteristics of MR fluid have sufficiently undertaken, but researches about rotary MR damper using shear-mode characteristics of MR fluid are not enough. In this paper, we performed vibration control of shear-mode MR damper for unlimited rotating actuator of mobile robot. Also fuzzy logic based vibration control for shear-mode MR damper is suggested. The parameters, like scaling factor of input/output and center of the triangular membership functions associated with the different linguistic variables, are tuned by genetic algorithm. Simulation results demonstrate the effectiveness of the fuzzy-skyhook controller for vibration control of shear-mode MR damper under impact force.

Modified Decentralized Bang-Bang Control Seismically Excited Structures Using MR Dampers (지진하중을 받는 구조물의 수정된 분산뱅뱅 제어기법을 이용한 MR Damper 제어)

  • Cho, Sang-Won;Kim, Byung-Wan;Kim, Woon-Hak;Lee, In-Won
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.417-423
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    • 2002
  • Magnetorheological(MR) 댐퍼는 적은 용량의 전력을 사용하고 반응속도가 빠른 장점 때문에 구조물의 내진제어에 적당하여, 근래에 주목받고 있는 새로운 장치이다. MR 댐퍼는 반능동 제어 장치로써, 능동 질량감쇠기와는 다른 특성을 갖는다. 즉 필요한 제어력을 제어신호로 직접 생성해 낼 수 없는 대신에 MR 댐퍼의 입력전원을 제어하여 간접적으로 제어한다. 따라서 MR 댐퍼의 반능동 제어장치로써의 특성을 고려하는 효과적인 제어기법이 요구된다. 그러므로 본 연구에서는 지진에 대한 구조물의 응답을 줄이기 위해서, MR댐퍼를 제어할 수 있는 반능동 제어기법을 Lyapunov 안정성 이론을 바탕으로 제안하고자 한다. 제안방법을 검증하기 위해, 전단형 MR 댐퍼를 1층과 2층에 설치한 수치예제를 수행하였다.

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Modeling of Shear-mode Rotary MR Damper Using Multi-layer Neural Network (다층신경망을 이용한 전단모드 회전형 MR 댐퍼의 모델링)

  • Cho, Jeong-Mok;Huh, Nam;Joh, Joong-Seon
    • Journal of Korean Institute of Intelligent Systems
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    • v.17 no.7
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    • pp.875-880
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    • 2007
  • Scientific challenges in the field of MR(magnetorheological) fluids and devices consist in the development of MR devices, the mathematical modeling and simulation of MR devices, and the development of (optimal) control algorithm for MR device systems. To take a maximum advantage of MR fluids in control applications a reliable mathematical model, which predicts their nonlinear characteristics, is needed. A inverse model of the MR device is required to calculate current(or voltage) input of MR damper, which generates required damping force. In this paper, we implemented test a bench for shear mode rotary MR damper and laboratory tests were performed to study the characteristics of the prototype shear-mode rotary MR damper. The direct identification and inverse dynamics modeling for shear mode rotary MR dampers using multi-layer neural networks are studied.

Analysis of the device to reduce an vertical vibration of elevator car using MR damper (MR댐퍼를 이용한 엘리베이터 카의 종진동 저감장치의 성능해석)

  • Jo, Seong-Oh;Lee, Hyun-Chang;Kim, Il-Gyoum;Park, Woo-Cheul
    • Proceedings of the KAIS Fall Conference
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    • pp.334-336
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    • 2007
  • 본 연구에서는 엘리베이터 카로 전달되는 수직방향의 진동을 억제하기 위하여 MR댐퍼를 장착한 시스템을 제안하고 시스템의 지배방정식을 도출하였다. MR댐퍼에 공급되는 전류에 의하여 엘리베이터 시스템의 응답특성을 관찰하였다. MR댐퍼에 공급되는 전류의 세기가 증가할수록 MR댐퍼의 감쇠력이 증가하여 엘리베이터 시스템의 가속도가 빠르게 줄어드는 것을 확인하였다.

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Experimental Modeling of MR Damper for Cruise Bus (우등버스용 MR 댐퍼의 실험적 모델링)

  • Sohn, Jeong-Hyun;Jun, Chul-Woong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.8
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    • pp.863-867
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    • 2011
  • In this paper, we analyze the characteristic test results of an MR damper for a cruise bus, and we model the nonlinear hysteretic characteristics of the damper using arctangent and polynomial functions. We establish an experimental model of the MR damper according to the input current, and we set the model parameters using the MATLAB Optimization Toolbox. The model is verified via a computer simulation of a full-car model.

Smart Passive System Based on MR Damper (MR댐퍼 기반의 스마트 수동제어 시스템)

  • Cho, Sang-Won;Jo, Ji-Seong;Kim, Chun-Ho;Lee, In-Won
    • Journal of the Earthquake Engineering Society of Korea
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    • v.9 no.1
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    • pp.51-59
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    • 2005
  • Magnetorheological(MR) dampers are one of the most promising semi active control devices, because they have advantages such as small power requirement, reliability, and low price to manufacture. To reduce the responses of structures with MR dampers, a control system including power supply, controller, and sensors is required. However, when a mount of MR dampers are used to a large?scale civil structure such as cable stayed bridges, the control system becomes complex. Therefore, it is not easy to install and maintain the MR damper based control system. To resolve above difficulties, This paper proposes a smart passive system that consists of a MR damper and an electromagnetic induction(EMI) system. According to the Faraday’s law of induction, EMI system that is attached to the MR damper produces electric energy. The produced energy is supplied to the MR damper. Thus, the MR damper with EMI system does not require any power at all. Furthermore, the induced electric energy is proportional to external loads like earthquakes, which means the MR damper with EMI system is adaptable to external loads without any controller and corresponding sensors. Therefore, it is easy to build up and maintain the proposed smart passive system.

The development of MR damper control modules for a vibration and noise decrease in Washing machine system (세탁기 진동소음의 저감을 위한 MR 댐퍼 컨트롤 모듈 개발)

  • Son, Kyung-Min;Kim, Min;Kim, Gwan-Hyung;Byun, Gi-Sik
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.185-187
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    • 2012
  • In this paper, the MR fluid damper to the application of the paramagnetic (paramagnetic) particles dispersed in the MR fluid inside the magnet current caused by the MR damper using the principles of the internal fluid delivery yield stress variation is characterized in Silky. In other words, the current strength of the MR fluid damper according to the internal friction coefficient varies phenomenon is to use. The MR fluid damper to control the MCU that you want to use Microchip's dsPIC chips, and current control in order to improve performance by using the PWM and UART communication to an external monitor to monitor the entire system was designed. In this study using MR fluid dampers and dsPIC chip dehydration process happens when a washing machine vibration and noise, vibration and noise reduction sikidorok washing machine protection systems are proposed.

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A Study on Cost-Effectiveness Evaluation and Optimal Design of ant dampers for Cable-Stayed Bridges (사장교에 장착된 MR 댐퍼의 비용효율성 평가 및 최적설계 연구)

  • Park, Won-Suk;Hahm, Dae-Gi;Koh, Hyun-Moo;Park, Kwan-Soon
    • Journal of the Earthquake Engineering Society of Korea
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    • v.10 no.6
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    • pp.47-56
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    • 2006
  • A method is presented for evaluating the economic efficiency of a semi-active magneto-rheological (MR) damper system for cable-stayed bridges under earthquake loadings. An optimal MR damper capacity maximizing the cost-effectiveness is estimated for various seismic characteristics of ground motion. The economic efficiency of MR damper system is addressed by introducing the life-cycle cost concept. To evaluate the expected damage cost, the probability of failure is estimated. The cost-effectiveness index is defined as the ratio of the sums of the expected damage costs and each device cost between a bridge structure with the MR damper system and a bridge structure with elastic bearings. In the evaluation of cost-effectiveness, the scale of damage cost is adopted as parametric variables. The results of the evaluation show that the MR damper system can be a cost-effective design alternative. The optical capacity of MR damper is increased as the seismic hazard becomes severe.

Study on Performance Comparison of MR Damper for Fluid Properties and Orifice Shapes (MR 유체물성과 오리피스 형상에 대한 MR 댐퍼 성능비교 연구)

  • Kwon, Young-Chul;Park, Sam-Jin;Kim, Ki-Young;Baek, Dae-Sung;Lee, Seok-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.3
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    • pp.1305-1310
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    • 2014
  • MR(Magneto-Rheological) damper generates the magnetic shear force due to the cohesiveness of MR fluid influenced by a magnetic field. MR fluid consists of magnetic particles and a base liquid. In the present study, the damping forces of MR damper were investigated for density 1.3, 1.5 and $1.7g/cm^3$, and viscosity 1000 and 10000cp, and for the change of orifice shapes. It was found that the increase in the density and viscosity of MR fluid could change the damping force of MR damper due to the magnetic effects. Also, the damping forces on orifice shapes increased as the orifice gap and length decreased. These results showed that the properties of MR fluid and orifice shapes were important for the optimum design of MR damper.