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How Magnetic Suspensions Work - Magnetic Ride Control
How Magnetic Suspensions Work - Magnetic Ride Control
Published: 2014/04/30
Channel: Engineering Explained
Smart Materials (4 of 5): Magneto Rheological (MR) Fluid
Smart Materials (4 of 5): Magneto Rheological (MR) Fluid
Published: 2011/05/30
Channel: cplai
Mod-07 Lec-06 Magneto-rheological (MR) Fluids
Mod-07 Lec-06 Magneto-rheological (MR) Fluids
Published: 2014/02/12
Channel: nptelhrd
Automobile Suspension System With Mr Damper
Automobile Suspension System With Mr Damper
Published: 2017/05/12
Channel: projectpark
Best Project Magneto Rheological Damper
Best Project Magneto Rheological Damper
Published: 2017/03/18
Channel: AK TECH
Semi-active suspension system: MR Dampers
Semi-active suspension system: MR Dampers
Published: 2016/10/28
Channel: Amrutha K
The Magnetic Shock Absorber Idea with Regenerative Power (1080 px)
The Magnetic Shock Absorber Idea with Regenerative Power (1080 px)
Published: 2014/08/23
Channel: debunkified
Audi Magnetic Ride
Audi Magnetic Ride
Published: 2012/03/25
Channel: caroto.gr
Application of Magneto-Rheological Fluid Based Actuators in Haptic Devices
Application of Magneto-Rheological Fluid Based Actuators in Haptic Devices
Published: 2015/04/07
Channel: Nima Najmaei
Magnetorheological fluid used in Liquid Body Armor
Magnetorheological fluid used in Liquid Body Armor
Published: 2011/07/25
Channel: Tài Hoàng
Oil Damper Witness Testing at ITT Enidine Buffalo
Oil Damper Witness Testing at ITT Enidine Buffalo
Published: 2016/05/26
Channel: (주)티이솔루션, TESolution
Magneto rheological fluid
Magneto rheological fluid
Published: 2015/03/14
Channel: SUNIL SHARMA
MR Fluid
MR Fluid
Published: 2012/08/10
Channel: Tibor Medvegy
MR Damper Movie prepared for IEEE IES SPTA ICM 2017
MR Damper Movie prepared for IEEE IES SPTA ICM 2017
Published: 2017/02/10
Channel: Sayed Royel
MR Suspension Control
MR Suspension Control
Published: 2011/09/29
Channel: Min-Sang Seong
Magneto-Rheological Dampers
Magneto-Rheological Dampers
Published: 2016/10/15
Channel: sreejith mohan
Mr fluid damper testing.
Mr fluid damper testing.
Published: 2017/05/06
Channel: Danial Gondal
LORD MR Humvee Video
LORD MR Humvee Video
Published: 2011/04/04
Channel: metalman4u2000
Magnetorheological Suspension Control System
Magnetorheological Suspension Control System
Published: 2013/05/01
Channel: Raymar Torres
[Vehicle Control 11] Modeling, Simulation and Control of Magnetorheological Brake System
[Vehicle Control 11] Modeling, Simulation and Control of Magnetorheological Brake System
Published: 2016/10/24
Channel: Khis Hudha
Ed Martin Acura 2011 MDX - Active Damper System
Ed Martin Acura 2011 MDX - Active Damper System
Published: 2011/04/20
Channel: EdMartinAcuraIndy
9 Story MR Damper Hybrid Simulation
9 Story MR Damper Hybrid Simulation
Published: 2010/08/26
Channel: gsn207nees
Magnetorheological elastomers with continually adjustable hardness
Magnetorheological elastomers with continually adjustable hardness
Published: 2015/04/11
Channel: Fraunhofer ISC
Advanced Damping Techniques using Magnetic Fields
Advanced Damping Techniques using Magnetic Fields
Published: 2013/06/12
Channel: dynxperts
Equipment Isolation System with Magneto-Rheological (MR) Damper (Overall)
Equipment Isolation System with Magneto-Rheological (MR) Damper (Overall)
Published: 2017/09/15
Channel: Shieh-Kung Huang
Equipment Isolation System with Magneto-Rheological (MR) Damper (Detail)
Equipment Isolation System with Magneto-Rheological (MR) Damper (Detail)
Published: 2017/09/15
Channel: Shieh-Kung Huang
Simulink Tutorial (Fuzzy Control Using MR dampers)
Simulink Tutorial (Fuzzy Control Using MR dampers)
Published: 2016/12/01
Channel: Omar Elmeligy
Electromagnetic Active Suspension System
Electromagnetic Active Suspension System
Published: 2011/04/14
Channel: TU Eindhoven
MR Fluid Bike Shock Mechatronics Project
MR Fluid Bike Shock Mechatronics Project
Published: 2013/05/13
Channel: CSUMechatronics
Dampers for earthquake protection
Dampers for earthquake protection
Published: 2011/05/03
Channel: teratecinc
MR Damper graphs
MR Damper graphs
Published: 2013/04/28
Channel: Eric Brettner
Acura Active Damper System
Acura Active Damper System
Published: 2011/09/29
Channel: Acura de Laval
Magneto Rheological Fluid
Magneto Rheological Fluid
Published: 2013/04/29
Channel: UK MRInfo
Theoretical analysis of forces in magnetorheological fluid based finishing process
Theoretical analysis of forces in magnetorheological fluid based finishing process
Published: 2013/10/17
Channel: Audioslides
Design and Characterization of a Small Scale Magnetorheological Damper for Tremor Suppression
Design and Characterization of a Small Scale Magnetorheological Damper for Tremor Suppression
Published: 2013/06/29
Channel: ranjith kumar
MR damper simulation using moving mesh (CFX)
MR damper simulation using moving mesh (CFX)
Published: 2017/08/23
Channel: GURU BASAVARAJ
MR damper as master, linear motor as slave (w contact force feedback)
MR damper as master, linear motor as slave (w contact force feedback)
Published: 2009/02/06
Channel: demotut
Leg brace with MR fluid brake : DigInfo
Leg brace with MR fluid brake : DigInfo
Published: 2010/10/22
Channel: ikinamo
Party Guy - Mr.Damper
Party Guy - Mr.Damper
Published: 2008/09/12
Channel: ttmmjj95
Norman M. Wereley | Protective Aircraft Seat Design
Norman M. Wereley | Protective Aircraft Seat Design
Published: 2014/02/12
Channel: Michigan Engineering
2017/07/11 MR Damper Performance Test (Cyclic Test)
2017/07/11 MR Damper Performance Test (Cyclic Test)
Published: 2017/07/11
Channel: Shieh-Kung Huang
Rea-Time Hybrid Testing of MR Dampers Video Contest Submission @ UConn
Rea-Time Hybrid Testing of MR Dampers Video Contest Submission @ UConn
Published: 2012/05/03
Channel: uconnengineering
MR Tortional Vibration Damper -- Electromagnet Testing
MR Tortional Vibration Damper -- Electromagnet Testing
Published: 2014/03/28
Channel: Yao Feng
BWI Group
BWI Group's Magneto-Rheological Powertrain Mount
Published: 2017/09/08
Channel: BWI Group
2017/07/11 MR Damper Performance Test (Random Stroke)
2017/07/11 MR Damper Performance Test (Random Stroke)
Published: 2017/07/11
Channel: Shieh-Kung Huang
Variable orifice automobile suspension damper
Variable orifice automobile suspension damper
Published: 2017/05/07
Channel: priyanka anantha
MR gel damper - AMSS Lab, IITM App Mech
MR gel damper - AMSS Lab, IITM App Mech
Published: 2008/08/24
Channel: Sivakumar Srinivasan
Rif mr fluid brake team
Rif mr fluid brake team
Published: 2015/03/14
Channel: Tarang Bansal
SS TF U2000 MR 0017  How to Replace the Damper
SS TF U2000 MR 0017 How to Replace the Damper
Published: 2015/11/25
Channel: artisJet Customer Care
HADE, Knee Cycling Using MRF Brake (1Hz/4kg)
HADE, Knee Cycling Using MRF Brake (1Hz/4kg)
Published: 2011/06/14
Channel: Gustavo Muñoz
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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A magnetorheological damper or magnetorheological shock absorber is a damper filled with magnetorheological fluid, which is controlled by a magnetic field, usually using an electromagnet.[1][2][3] This allows the damping characteristics of the shock absorber to be continuously controlled by varying the power of the electromagnet. Fluid viscosity increases within the damper as electromagnet intensity increases. This type of shock absorber has several applications, most notably in semi-active vehicle suspensions which may adapt to road conditions, as they are monitored through sensors in the vehicle, and in prosthetic limbs.[4]

Types[edit]

Commercial Applications[edit]

Many applications have been proposed using magnetorheological (MR) dampers, while only few have been commercialized, with the exception of the new Ferrari 812 Superfast. While vehicle applications are the most common use of MR dampers, useful medical applications have risen as well, including implants and rehabilitation methods.[5] Since MR dampers and not yet perfect, they are limited in terms of application. Disadvantages do exist when using a large scale MR damper, for example, particle settling within the carrier fluid may occur that inhibits some possible application.

History[edit]

The technology was originally developed by General Motors Delphi Automotive Division based in the USA and then developed further by BeijingWest Industries in China after BeijingWest Industries bought the technology from General Motors. BeijingWest Industries has subsequently introduced improvements including a redesigned ECU and the introduction of a dual coil system.

Ground-based vehicles[edit]

These types of systems are available from OEMs for several vehicles, including the Acura MDX, Audi TT and R8, Buick Lucerne, Cadillac ATS, CTS-V, DTS, XLR, SRX, STS, Chevrolet Corvette, Camaro ZL1, Ferrari 458 Italia, 599GTB, F12 Berlinetta, Shelby GT350, Holden HSV E-Series and Lamborghini Huracán.[2] These systems were produced by the Delphi Corporation and now by BWI Group under the proprietary name MagneRide.[6][7]

MillenWorks has also included them in several military vehicles including the MillenWorks Light Utility Vehicle, and in retrofits to the US Army Stryker and HMMWV for testing by TARDEC.[8][9]

Aviation[edit]

MRF-based dampers are excellent candidates for stability augmentation of the lead-lag (in-plane bending) mode of rotor blades in helicopters.[10] MRF-based squeeze film dampers are being designed for use in the rotary wing industry to isolate vibrations from the aircraft structure and crew.[11]

Control[edit]

A magnetorheological damper is controlled by algorithms specifically designed for the purpose. There are plenty of alternatives, such as skyhook or groundhook algorithms.[12] The idea of the algorithms is to control the yield point shear stress of the magnetorheological fluid with electric current. When the fluid is in the presence of an applied magnetic field, the suspended metal particles align according to the field lines. Viscosity of the fluid increases according to the intensity of the magnetic field. When this occurs at the right instant, the properties of the damper change helps in attenuating an undesired shock or vibration. The relative efficacy of magnetorheological dampers to active and passive control strategies is usually comparable.[13]

See also[edit]

References[edit]

  1. ^ a b "Innovative Designs for Magneto-Rheological Dampers" (PDF). Retrieved 2013-12-08. 
  2. ^ a b Primary Suspension Archived October 14, 2007, at the Wayback Machine.
  3. ^ http://www.lord.com/Home/MagnetoRheologicalMRFluid/MRFluidTechnology/tabid/3318/Default.aspx MR Fluid Technology Archived October 13, 2007, at the Wayback Machine.
  4. ^ Technology Compared Archived October 17, 2007, at the Wayback Machine.
  5. ^ Carlson, J.D.; Matthis, W.; Toscano, J.R. (March 2001). "Smart Prosthetics Based on MR Fluids". Proc. 8th annual symposium On Smart Structure And Material SPIE. 
  6. ^ "Press Release: Audi R8 Features Delphi's Revolutionary MagneRide Semi-Active Suspension". Delphi.com. Retrieved 2013-12-08. 
  7. ^ "Ferrari F12 Berlinetta news and pictures new Ferrari supercar". evo. 2012-02-29. Retrieved 2012-03-05. 
  8. ^ http://www.millenworks.com/html/aboutus/news/Stryker_Test.pdf MillenWorks Active Damper Suspension System Archived November 29, 2007, at the Wayback Machine.
  9. ^ "A New Generation of Magneto-Rheological Fluid Dampers" (PDF). Retrieved 2013-12-08. 
  10. ^ “Characterization of Magnetorheological Helicopter Lag Dampers.” G.M. Kamath, N.M. Wereley, and M.R. Jolly (1999). J. American Helicopter Society, 44(3):234–248.
  11. ^ http://www.hindawi.com/journals/ijrm/2004/546845/abs/ A Magnetorheological Fluid Damper for Rotor Applications
  12. ^ Magnetorheological Damper Laboratory
  13. ^ ALY, Aly Mousaad; Richard Christenson (2008). "On the evaluation of the efficacy of a smart damper: a new equivalent energy-based probabilistic approach". Smart Materials and Structures. 

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