• Title, Summary, Keyword: Magneto-rheological Fluid

Search Result 132, Processing Time 0.044 seconds

Dynamic Characteristics Analysis of A Magneto-Rheological Damper (MR 댐퍼의 동특성 해석)

  • Jeong, Hee-Kyung;Baek, Woon-Kyung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.222-227
    • /
    • 2002
  • MR(Magneto-rheological) fluid is smart fluid that can change its characteristics then magnetic fields are applied. Recently, many researches have been performed on this MR fluid for the application in a vareity of areas including automobile shock absorbers. This paper describes the design procedure of a MR damper and the analysis results of its dynamic characteristics. MR fluid in the magnetic field shows initial yield shear stress and increasing resistive viscosity with final saturation thereafter. Herschel-Bulkley model is used to simulate the flow characteristics of MR fluid and magnetic analysis is used to identify the magnetic property of the MR fluid in the orifice of the damper. The dynamic characteristics of the damper was predicted and compared with the experimental results for typical sinusoidal excitations.

  • PDF

Performance Analysis of a Magneto-Rheological Fluid Engine Mount (MR유체 엔진마운트의 성능해석)

  • 안영공;김원철;양보석
    • Journal of KSNVE
    • /
    • v.8 no.3
    • /
    • pp.457-466
    • /
    • 1998
  • This paper evaluates the performance of a Magneto-Rheological (MR) fluid mount. The mount incorporates MR fluid in a conventional fluid mount to open and closed the inertia track between the fluid chambers of the mount. It is shown that such switching of the inertia track improves the mount's isolation effect, by eliminating the large transmissibility peak that commonly exists at frequencies higher than the notch frequency for conventional fluid mounts. The switching frequencies of the MR mount is evaluated, based on the parameters of the mount. A simple control scheme for switching the mount between the open and closed states is proposed, and the performance of the controlled mount is compared with conventional mounts. A sensitivity analysis is conducted to evaluate the effect of parameter errors in estimating the switching frequencies and mount performance. The results show that the switching frequencies can be accurately determined from mount parameters that are easily measured or estimated.

  • PDF

Electro-Magnetic Field Analysis for Optimal design of Magneto-Rheological Fluid Damper Core (자기점서유체 댐퍼 코어의 최적화 설계를 위한 전자기장 해석)

  • Song, June-Han;Son, Sung-Wan;Chun, Chong-Keun;Kwon, Young-Chul;Ma, Yang-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.9 no.6
    • /
    • pp.1511-1517
    • /
    • 2008
  • The magneto-rheological fluid expresses different cohesiveness according to the strength of the external electric current. The magneto-rheological fluid damper, which uses such characteristics of the fluid, generates shear force due to the fluid's cohesiveness. The core can be said to determine the magneto-rheological fluid damper's performance. This study uses the finite element analysis to compare the performance of different electromagnetic forces, which are affected by the shapes of the coil, and thus to find the optimum design for the core. In addition, as a step to construct a high-efficient damper, we suggest a type of damper that can control multiple coils and compares the performance of this damper and that of the standard damper by comparing the performance of their electro-magnetic fields.

Dynamic Characteristics Analysis of A Magneto-Rheological Damper (MR 댐퍼의 동특성 해석)

  • Jeong, Hee-Kyung;Baek, Woon-Kyung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.328.1-328
    • /
    • 2002
  • MR(Magneto-rheological) fluid is smart fluid that can change its characteristics when magnetic fields are applied. Recently, many researches are going on this MR fluid for the application in a variety of areas including automobile shock absorbers. This paper describes the design procedure of a MR damper and the analysis results of its dynamic characteristics. MR fluid in the magnetic field shows initial yield shear stress and increasing resistive viscousity with final saturation thereafter. (omitted)

  • PDF

Improvement of Transient Response Characteristics of Pneumatic Manipulator using MR Brake (MR Brake를 이용한 공압 머니퓰레이터의 과도응답특성의 향상)

  • Ahn K.K.;Song J.Y.
    • Transactions of The Korea Fluid Power Systems Society
    • /
    • v.1 no.1
    • /
    • pp.17-22
    • /
    • 2004
  • The goal of this paper is to improve the position control performance of pneumatic rotary actuator with variable brake using Magneto-Rheological Fluid. The air compressibility and the lack of damping of the pneumatic actuator bring the dynamic delay of the pressure response and cause the oscillatory motion. In this study, a variable rotary brake comprising Magneto-Rheological Fluid is equipped to the joint of a pneumatic manipulator. Experiments of step response have proved that the transient response of the manipulator could be improved compared with that of the conventional control algorithm by using a phase plane switching control algorithm.

  • PDF

High-performance Magneto-rheological Damper Design (고성능 MR댐퍼의 설계)

  • 이종석;백운경
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.14 no.6
    • /
    • pp.470-477
    • /
    • 2004
  • This study shows the design process of a MR damper for semi-active suspension systems. Damping force characteristics of the designed damper was predicted through the flow analysis and magnetic analysis. The predicted results were compared with the experimental results and the initial design specification was modified according to the results.

Effect of compression on the response of a magneto-rheological suspension

  • See, Howard;Mackenzie, Steven;Chua, Boon Teck
    • Korea-Australia Rheology Journal
    • /
    • v.18 no.3
    • /
    • pp.121-126
    • /
    • 2006
  • A carbonyl iron-based magneto-rheological suspension was compressed in the direction of the applied magnetic field and the change in rheological properties was measured. It was found that the compression did not have a large effect on the magneto-rheological response, which is in contrast to recent reports in the literature describing an almost order of magnitude increase in the shear yield stress. The difference can be attributed to the latter test's use of a sliding wedge apparatus which imparts considerable shearing to the sample during the compression.

Property of Multi-Dirction Mount Using Magneto-Rheological Fluid (MR유체를 이용한 다방향 제진형 마운트의 응답특성)

  • Ahn, Young-Kong;Sin, Dong-Choon;Yang, Bo-Suk;Lee, Il-Young;Kim, Dong-Jo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.187-189
    • /
    • 2002
  • This paper presents property of the squeeze mode type mount using Magneto-Rheological fluid(MR fluid). The mount can isolate multi-directional vibrations, and also effectively reduce the vibrations in a wide range of disturbance frequencies by controlling the applied magnetic field. The shape of the mount is the same that of squeeze film damper. In the present work, the performance of this mount was experimentally investigated according to changing the magnetic field strength.

  • PDF

Property of Multi-Direction Mount Using Magneto-Rheological Fluid (MR유체를 이용한 다방향 제진형 마운트의 응답특성)

  • Ahn, Young-Kong;Sin, Dong-Choon;Yag, Bo-Suk;Kim, Dong-Jo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.325.1-325
    • /
    • 2002
  • This paper presents property of the squeeze mode type mount using Magneto-Rheological fluid (MR fluid). The mount can isolate multi-directional vibrations, and also effectively reduce the vibrations in a wide range of disturbance frequency by controling the applied magnetic field. The shape of the mount is the same that of squeeze film damper. In the present work, the performance of this mount was experimentally investigated according to changing the magnetic field strength. (omitted)

  • PDF

Design of Compact Magneto-Rheological Fluid Damper for Artificial Low-Limb Prosthesis (Magneto-Rheological Fluid를 이용한 인공지능 의족의 Compact damper 개발)

  • Sung, So-Young;Kang, S.J.;Moon, I.H.;Moon, M.S.;Jang, S.M.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.2962-2964
    • /
    • 2005
  • Magneto-Rheological (MR) fluid is suspension of fine magnetic particles in a liquid carrier such as silicon oil or water. MR fluid exhibits solid-like mechanical behavior into chain or clusters with high yield stress when magnetic field is applied to the particles. The response of MR fluids is very quick and reversible after removal of the field. MR Fluids have high yield stress (up to 5kPs) and operate in low voltage power supply. Recently, MR damper using MR fluids was open used in vibration control system such as structural devices, seat vibration controllers and helicopter rotor systems, but it is too big in size and heavy. Therefore, it is not appreciate to rehabilitation devices such as prosthetic limbs.

  • PDF