• Title, Summary, Keyword: MR damper

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Performance Evaluation on an MR Damper Featuring Bypass Hole for Passenger Vehicle (바이패스홀을 특징으로 하는 승용차용 MR 댐퍼의 성능 평가)

  • Oh, Jong-Seok;Shin, Do-Kyun;Sohn, Jung-Woo;Choi, Seung-Bok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.998-999
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    • 2014
  • This paper proposes a method for damping force modeling of magnetorheological (MR) damper featuring bypass hole. After describing configuration and of the MR damper, a damping force modeling of the MR damper is derived based on Bingham model of MR fluid. MR damper consists of piston, accumulator, gap, bypass hole and coil. Damping force is consists of spring force induced by accumulator, viscous force induced at gap and bypass hole, and controllable force induced at gap.

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Design of MR damper with multi_stage core (다중 자기 코일 작동기를 사용한 MR damper의 설계해석)

  • Lee, Gyu-Seop;Yoo, Won-Hee;Ryu, Bong-Jo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.525-528
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    • 2008
  • The dynamic range of MR damper is the most important characteristics for the usage of semi-active control system. The damping force can be increased by simply decresing the orifice gap in the traditional oil damper, but it deteriorate the dynamic range in MR damper. In this paper, the multi-stage electro-magnetic core is suggested to maintain the performance of MR damper with a large damping force. The MR damper with 3 stage core is designed and manufactured for testing and analysis.

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Dynamic Characteristic Analysis of MR Impact Damper for Vehicle System (차량용 MR 충격댐퍼의 동특성 해석)

  • Song, Hyun-Jeong;Woo, David;Choi, Seung-Bok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.147-152
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    • 2006
  • This paper presents the dynamic characteristics of MR impact damper for vehicle collision system. Various types of mechanism have been proposed for reduce transmitted force to vehicle chassis and finally protect occupants from injury. In the case of frontal collision, the bumper make main role of isolation material for collision attenuation. In this study, proposed bumper system composed of MR impact damper and structures. The MR impact damper is to adopted MR fluid which has reversible properties with applied magnetic field. MR fluid operates under flow mode with Bingham flow and bellows is used for generation of fluid flow. Mathematical model of MR impact damper incorporated with MR fluid is established. Field dependent damping force is investigated with time and frequency domain. The MR impact damper is then incorporated with vehicle crash system. The governing equation of motion of vehicle model is formulated considering occupant model. Dynamic characteristics of vehicle collision system investigated with computer simulation.

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Dynamic Characteristic Analysis of MR Impact Damper for Vehicle System (차량용 MR충격댐퍼의 동특성 해석)

  • Song, Hyun-Jeong;Woo, Da-Vid;Choi, Seung-Bok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.16 no.7
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    • pp.754-761
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    • 2006
  • This paper presents the dynamic characteristics of MR impact damper for vehicle collision system. Various types of mechanism have been proposed to reduce force transmitted to the vehicle chassis and finally to protect occupants from injury. In the case of head-on collision, the bumper makes main role of isolation material for collision attenuation. In this study, the proposed bumper system consists of MR impact damper and structures. The MR impact damper utilizes MR fluid which has reversible properties with applied magnetic field. The MR fluid operates under flow mode. The bellows is used for generation of fluid flow. A mathematical model of the MR impact damper is derived incorporating with Bingham model of the MR fluid. Field dependent damping force is investigated with time and frequency domain. The MR impact damper is then incorporated with vehicle crash system. The governing equation of motion of vehicle model is formulated considering occupant model. Dynamic characteristics of vehicle collision system investigated with computer simulation.

Vehicle Suspension Control Using an MR Damper of a Bouc-Wen Model Obtained from Experimental Studies (실험적으로 구한 MR 댐퍼의 개선된 Bouc-Wen 모델을 이용한 자동차 서스펜션 제어)

  • Jeon, Hyeong-Jin;Jung, Seul
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.2
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    • pp.151-157
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    • 2010
  • This paper presents the modelling of an MR damper system through extensive experimental studies. The hysteresis of the MR damper is modelled by using the improved Bouc-wen model. A test bed for experimental studies of measuring parameters of the MR damper is designed and implemented. Based on the experimental data, the Bouc-Wen Model is modified for the MR damper system. To check the modelling property, a vehicle suspension system is controlled using a PID controller for the verification of the MR damper model.

Performance Evaluation of Vibration Control of Adjacent Buildings According to Installation Location of MR damper (인접건축물의 진동제어를 위한 MR감쇠기의 위치 선정에 관한 연구)

  • Kim, Gee-Cheol;Kang, Joo-Won
    • Journal of Korean Society of Steel Construction
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    • v.24 no.1
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    • pp.91-99
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    • 2012
  • In recently, the vibration control of adjacent buildings have been studied and magneto-rheological(MR) fluid dampers have been applied to seismic response control. MR dampers can be controlled with small power supplies and the dynamic range of this damping force is quite large. This MR damper is one of semi-active dampers as a new class of smart dampers. In this study, vibration control effect according to the installation location of the MR damper connected adjacent buildings has been investigated. Adjacent building structures with different natural frequencies were used as example structures. Groundhook control model is applied to determinate control force of MR damper. In this numerical analysis, it has been shown that displacement responses can be effectively controlled as adjacent buildings are connected at roof floors by MR damper. And acceleration responses can be effectively reduced when two buildings are connected at the mid-stories of adjacent buildings by MR damper. Therefore, the installation floor of the MR damper should be selected with seismic response control target.

Experimental Performance Evaluation of MR Damper for Integrated Isolation Mount (통합제진마운트용 MR 댐퍼의 실험적 성능 평가)

  • Seong, Min-Sang;Choi, Seung-Bok;Kim, Cheol-Ho;Lee, Hong-Ki;Baek, Jae-Ho;Han, Hyun-Hee;Woo, Je-Kwan
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.12
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    • pp.1161-1167
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    • 2010
  • This paper presents experimental performance evaluation of a magnetorheological(MR) damper for integrated isolation mount for ultra-precision manufacturing system. The vibration sources of the ultra-precision manufacturing system can be classified as follows: the one is the environmental vibration from the floor and the other is the transient vibration occurred from stage moving. The transient vibration occurred from the stage moving has serious adverse effect to the process because the vibration scale is quite larger than other vibrations. Therefore in this research, a semi-active MR damper, which can control the transient vibration, is adopted. Also the stage needs to be isolated from tiny vibrations from the floor. For this purpose, a dry-frictionless MR damper is required. In order to achieve this goal, a novel type of MR damper is originally designed and manufactured in this work. Subsequently, the damping force characteristics of MR damper are evaluated by simulation and experiment. In addition, the vibration control performance of the MR damper associated with the stage mass is evaluated.

Experimental Performance Evaluation of MR Damper for Integrated Isolation Mount (통합제진마운트용 MR 댐퍼의 실험적 성능 평가)

  • Seong, Min-Sang;Choi, Seung-Bok;Kim, Cheol-Ho;Lee, Hong-Ki;Baek, Jae-Ho;Han, Hyun-Hee
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.65-70
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    • 2010
  • This paper presents experimental performance evaluation of a magnetorheological (MR) damper for integrated isolation mount for ultra-precision manufacturing system. The vibration sources of the ultra-precision manufacturing system can be classified as follows: the one is the environmental vibration from the floor and the other is the transient vibration occurred from stage moving. The transient vibration occurred from the stage moving has serious adverse effect to the process because the vibration scale is quite larger than other vibrations. Therefore in this research, a semi-active MR damper, which can control the transient vibration, is adopted. Also the stage needs to be isolated from tiny vibrations from the floor. For this purpose, a dry-frictionless MR damper is required. In order to achieve this goal, a novel type of MR damper is originally designed and manufactured in this work. Subsequently, the damping force characteristics of MR damper are evaluated by simulation and experiment. In addition, the vibration control performance of the MR damper associated with the stage mass is evaluated.

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Damping Force Characteristics of MR Damper with Additional Flow Path (부가적인 유로가 있는 MR 댐퍼의 감쇠력 특성)

  • Sohn, Jung Woo;Oh, Jong-Seok;Choi, Seung-Bok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.6
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    • pp.426-431
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    • 2015
  • In this work, a new type of MR damper with additional flow path in piston is proposed and damping force characteristics are numerically evaluated. Flow-mode type MR damper is considered and mathematical model is established based on Bingham rheological model of MR fluid to obtain accurate prediction of damping force characteristics. Damping force of the proposed MR damper are calculated with respect to piston velocity and input current. In addition, investigation on damping force characteristics is carried out according to number of additional flow path and excellence of the proposed MR damper is demonstrated.

Response and control of jacket structure with magneto-rheological damper at multiple locations/combinations

  • Syed, Khaja A.A.;Kumar, Deepak
    • Ocean Systems Engineering
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    • v.8 no.2
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    • pp.201-221
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    • 2018
  • In this paper a comprehensive study for the structural control of Jacket platform with Magneto-Rheological (MR) damper is presented. The control is implemented as a closed loop feedback of the applied voltage in the MR Damper using fuzzy logic. Nine cases of combinations with MR damper are presented to complete the work. The selection of the MR damper (RD 1005-3) is based on the operating parameters (i.e., the range of frequency and displacement). Bingham model is used to obtain the control forces. The damping co-efficient of the model is obtained using empirical relationship between the voltage in the MR damper and input velocity from the structural members. The force acting on the structure is obtained from Morison equation using P-M spectrum. The results show that the reliable control was obtained when there was a continuous connection of multiple MR dampers with the lower levels of the structure. Independent MR dampers at different levels provided control within a range, while the MR dampers placed at alternate positions gave very high control.