International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS)

Volume VI, Issue XI, November 2017 | ISSN 2278-2540

Investigation on Magnetorheological Damper for Its

Various Applications
Sidharth Sharma1, Sumanyu Khurana2
1 ,2
Department of Mechanical Engineering, Amity School of Engineering and Technology, Amity University, Noida, Uttar
Pradesh, India

Abstract: - Magneto Rheological damper is a special type of Magnetorheological fluids consists of micron sized, ferrous
damper that is filled with Magnetorheological fluids which can particles (mainly iron) that are suspended in an appropriate
be controlled by magnetic field using an electromagnet. These carrier medium such as mineral oil, synthetic oil, water or
types of smart fluids change their physical properties when ethylene glycol. The MR effect is immediately reversible if
subjected to magnetic field and turn into visco-elastic solids in
few milliseconds. This property allows the MR damper to be
the magnetic field is reduced or removed. Response times of
used as a shock absorber by controlling its damping 6.5 ms have been recorded. If the magnetic field is reduced or
characteristics by changing the intensity of electromagnet. This removed, the MR effect is straight away reversible.The
paper focuses on the various applications of MR dampers in recorded response time is 6.5 milliseconds.MR materials that
latest technologies. have been already developed are usually stable in temperature
ranges from –50oC to 150oC. Magneto rheological materials
Keywords- Magneto rheological damper, Electro rheological
damper, Vehicle, Suspension are more advantageous than electro rheological materials. In
compare to electro rheological materials, MR fluids are more
constructive because of the large change in their physical
I. INTRODUCTION
properties[6].On comparison to ER materials, MR materials

T he magnetorheological damper was patented by J. David

Carlson and Michael J.Chrzan on 11 Jan 1994. The
discovery of MR fluids is ascribed to Jacob Rabinow in
respond less to moisture and contaminants, and as a result
they could be used in dirty or contaminated environments.
The power (50 W) and voltage (12–24V) requirements for
1940’s. MR dampers are semi-active devices that are filled MR materials activation are comparatively small as compared
with magnetorheological fluids. When magnetic field is with ER materials. Moreover, the MR Fluid and different
applied, the MRF varies from liquid to semi-solid state in just carriers is given in Table1.
few milliseconds, so the outcome is an infinitely variable,
TABLE 1: MR FLUIDS AND DIFFERENT CARRIERS
controllable damper are capable of large damping forces[1].
The MR fluid is controlled by magnetic field using an
electromagnet. As the electromagnet intensity increases the
fluid viscosity also increases within the damper. MR dampers
offer a striking solution to energy absorption in mechanical
systems could be considered as “fail-safe” device. Many
everyday items are already incorporating smart materials
(bikes, cars, glasses, washing machines) and the number of
applications for them is growing steadily.
Magnetorheological (MR) fluid is a functional fluid that
changes its physical characteristics when magnetic field is
applied.Magnetorheological fluids (MRFs) consist of
suspended ferrous particles like carbonyl iron particles that
are micron sized, and are dispersed in a carrier medium. When
magnetic field is applied these suspended particles in MRF
gets magnetised and align themselves in structures like chains
which resists the shear deformation of fluid. This change in
material results in a rapid increase in viscosity or in the
formation of a semisolid state[2]–[5]. III.CONSTRUCTION AND WORKING OF MR DAMPER
MR dampers consist of a piston, magnetic coil, accumulator,
II. MR FLUIDS AND ITS BEHAVIOUR bearing, seal, and damper reservoir which are filled with

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 International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS)
Volume VI, Issue XI, November 2017 | ISSN 2278-2540

MRF. The fig.1 shows the schematic diagram of MR damper. Semi active suspension systems are becoming more popular in
In this damper as soon as the piston rod enters the housing, automobiles as they can overcome all the inherent limitations
MRF in the piston head flows from high pressure chamber to of passive and active suspension systems and also combine
low pressure chamber through orifices. The accumulator the advantages of both. This is due to their design simplicity,
consists of a compressed gas and its piston provides a infinite possible dynamics, low voltage requirements, better
moveable barrier between MRF and the gas. When a current damping capacity.Ride comfort and vehicle stability are two
travels through the solenoid a magnetic field is developed main concerns while designing an effective suspension
which causes the fluid to change its state from the fluid to system. The selection of damper is typically a tradeoffbetween
semi-solid. When there is no external magnetic field applied, these requirements.
the iron particles are randomly suspended and the fluid shows
The selection of MR fluid is done on the basis of purpose the
behaviour of an incompressible fluid and this act like a
vehicle is serving i.e., sports cars, luxury cars or heavy
passive system. The properties of semi-active system can be
vehicles. Semi active suspension system using MR dampers
regulated in response to a command signal using a small
necessitates two nested controllers as shown in fig 2 and fig 3.
external power source[2].
A system controller which reads the road profile and
computes damping force required. Since MR dampers
function on the applied voltage, a damper controller
commands the damper to give the desired force. There are
various control algorithms to perform the above mentioned
function[6].

Fig.1- MR Fluid Damper constructional model

IV. APPLICATIONS Fig.2. Quarter Model of a vehicle suspension system

MR dampers are used as a shock absorbing or damping and

vibration controlling device. It has a vast range of application
in field of automobile, defence and various medical
purposes.This Magneto Rheological Shock Absorber is used
in mentioned automobiles i.e., 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[7]–
[10]. However, The applications of MR damper system is not
only restricted up to shock absorbers in automobiles but also it
is being used in man researches in field of defence, medical
applications like prosthetic limbs and in designing massive
structures with can be full proofed from natural disasters[1],
[11]–[14].
4.1. MR Damper in Automobile Sector
Fig.3.MR damper ON and OFF state

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 International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS)
Volume VI, Issue XI, November 2017 | ISSN 2278-2540

Other than the application of MR dampers in vehicle Dongting Lake Bridge is a cable-stayed bridge crossing the
suspension system, it can also be used in car seat suspension. Dongting River[6].
This easy to implement, improved design for car seat will
improve the ride comfort for driver and the passengers. The
problem of poor feel of seat suspensions can be removed by
employing MR damper using skyhook algorithm. MR
dampers have a lot of potential to be used in motorcycle
suspensions system also. Currently, it is used in only high end
sports bikes. Motorcycle suspension designers have
historically sought a good compromise between a comfortable
ride and performance handling. The new Ducati Multistrada
1200 S shown in the fig.4 has an innovative Ducati skyhook
suspension with reduced vibrations and better vehicle
Fig 5. Dongting Lake Bridge, China
stability[6].
When the bridge was made, the designer realised it was
sensitive to vibrations due to wind and heavy raining as
shown in fig 5. So a study was carried out, which deduced that
with the help of MR dampers this problem can be resolved.
Other than this MR dampers are used in railway bridges and
buildings in earthquake prone areas.
4.3. MR Fluid in Defense
Researches are being carried out to develop smart Kevlar vest
with layers of MR fluids. These vests can be hardened before
a blink of the eye by applying magnetic field across it. In the
absence of magnetic field, the vest is light and flexible but
Fig 4- Ducati Multistrada 1200 S with DSS Semi active suspension system. with a flip of a switch it can stiffen as shown in fig 6. Defence
research agencies are designed armour suits using MR fluids
Unfortunately, this comprises generally leads to a suspension that can sustain impact of grenades by preventing the shrapnel
design that is good for a mix of performance and comfort, yet from piercing the suit. The United States of America’s army,
does not excel at either of the two. Usually the tuning of California is working on using MR dampers in army heavy
motorcycle suspension system is done by changing the fluid vehicles like Army's HMMWV Hummer. Still it is going to
viscosity of the front fork. In case of using a MR damper, take more work in this field before MR fluid vest can stop
changing the fluid viscosity is consummated by varying the bullets in battles[6].
magnetic field intensity using electromagnets. The use of MR
dampers can be seen in quite a few four wheeler vehicles but
still its use in two wheelers is very less due to its cost.There
are many studies and researches carried out in application of
MR dampers for motorcycle suspension system. They all
prove that it is perfect solution for improving the stability of
motorcycles and are far better than the conventional OEM
suspension systems[6].
4.2. MR Damper in Structural Applications
MR dampers are one of the most prospective semi active
control devices for civil engineering applications to
earthquake hazard mitigation, because they have many
advantages such as small power requirement, reliability, and
low price to manufacture. A smart passive system based on an
MR damper system without including a power supply,
controller, and sensors consists of an MR damper and an Fig6. MR fluid used in Kevlar vest
electromagnetic induction (i.e., EMI) system that uses a
permanent magnet and a coil. The electromotive force induced 4.4. MR Damper in Prosthetic limbs
by movement of a structure can control MR damper It is one of the major innovations in prosthetic limbs for
effectively without any external power supply and control.The amputees. Biedermann Motech, (a Germany based

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 International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS)
Volume VI, Issue XI, November 2017 | ISSN 2278-2540

manufacturer of spinal implants and prosthetic legs) has also creates shock and vibrations on passengers[23]–[25]. There
recently commercialized an MR damper for a prosthetic knee; are two such systems i.e., active and semi-active suspension
this includes in-house damper, controller and battery as shown system as shown in fig 8. Since the required forces to keep the
in fig 7. The use of MR damper in prosthetic legs have made system stable are excessive in rail vehicles, active suspension
it many times more responsive than the conventional stepper system can become unstable. So, the more appropriate
motor power devices. MR technology provides infinitely solution to this is using a semi active suspension system using
variable, real-time damping control. Slopes and stairs have MR dampers. It can precisely control its damping
been giving real hard time to amputees but with this system characteristics according to the rail track profile[2]–[5], [7]–
they can experience nearest neural human response time [10], [15]–[26]. It is proven through various researches and
possible.Conventional stepper motor–powered prosthetic studies that rail vehicle vibrations have been abridged
devices lack the same degree of stability that throughthe damping force generated by MR damper.
BiedermannMotech's battery-operated and electronically
controlled MR damper knee mechanisms can provide and they
are more flexible and have less complicated controlling
capabilities. This MR damper is incorporated with different
sensors to adjust any changes in the walking speed, up or
down hill motion. The system analyzes the patients gait to
adapt knee motion accordingly and respond to it in few
milliseconds[6].

Fig. 8 Semi active suspension model using MR dampers.

V. EXPERIMENTAL SETUP OF MR DAMPERS

5.1. Constructionand Testing
The experimental set up consists of vibration exciter, laptop
and two accelerometers (one placed near or on the vibration
exciter and other on top on mass pan).

Fig 7. Application in Prosthetic Leg

The receptiveness of this MR Fluid is below 10 milliseconds,

and the resistance against force can be varied over an infinite
range. This property makes MR fluid perfect for improving
this technology.
4.5. MR Dampers in Rail Vehicles
So as to solve increasing traffic problems and air pollution,
the importance of rail vehicles has risen as one of the mass
transportation systems[15]–[22]. One of the most important
factor to provide comfort, safety and stability in rail vehicles
is suspension system which absorbs the energy caused by
disruptive effects and aims to reduce transmitting of
Fig 9 (a)Experimental setup
vibrations to the car body to cover the rail irregularity which

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 International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS)
Volume VI, Issue XI, November 2017 | ISSN 2278-2540

Upper X=5.758
500g 20.350 1.22
Lower Xst=4.687

VI. LIMITATIONS AND REMEDIES

Although smart fluids have many potential applications but
they are limited in commercial feasibility because of the
following reasons:
 Settling stability of MR fluid.
 MR fluids of high quality are expensive.
 Durability of devices.
 Generation of heat in shock absorber because of coil.
Fig 9(b) Sketch of the experiment Active suspension use electro-hydraulic actuators which are
commanded to give a desired control force. The active
The MR damper was used in this study has 36.5cm length suspension has high control performance over a wide
with 1333gm weight. Also it requires bottom fixture length frequency range. However, it is very expensive and cannot be
5cm with M8 internal thread with 12V and 9amp.D.C.power used for commercial application as it requires a high power
supply as shown in Fig 9 . supply, many sensors, and servo-valves.
5.2. Response of Frequency, Amplitude response at different A semi-active suspension uses MR or ER dampers which are
loading condition. commanded by two nested controllers that are system
When the MR damper experiment was held out without controller and damper controller. A semi-active suspension
magnetic field under zero load, 200gm load, 400gm load contains the properties of both i.e. active suspension as well as
respectively the frequency was found to be decreased with an passive suspension. It is much more effective and
increase in the ratio of input to output(X/Xst) and as when the economical.If the system fails then the semi-active suspension
MR damper experiment was tested with magnetic field under can also work as a passive suspension. Various applications in
same loads respectively the frequency decreased with the field of defence are yet to be worked on to become
decrease in the ratio of input to output(X/Xst) as shown in feasible.
Table 2. VII. CONCLUSIONS
Table 2: Frequency, Amplitude response at different Magneto-rheological dampers (MR dampers) have a lot of
loading condition without Magnetic field. potential use in applications where controllable damping force
Loading is necessary. These applications consist of dampers for
Acceleromete frequenc Amplitude(m/s2 Ratio(X/Xst
conditio automobiles (Acura MDX), heavy commercial and army
r Position y ) )
n
vehicles (U.S. HUMMER VS, Rail vehicles),Motorbikes
Upper X=4.396 (Ducati Multistrada1200 S with DSS system), prosthetic knee
Zero load 22.325 1.38
Lower Xst=3.183 and legs, special Kevlar armours and others.This suspension
Upper X=5.212 system when used in automobiles will provide better vehicle
250g 21.00 1.41 stability and ride comfort than the conventional passive
Lower Xst=3.690
systems. It applies a smart controllable approach to handle the
Upper X=12.230 vibrations caused due to change in road profile.
500g 19.350 1.50
Lower Xst=8.110
Passive type suspension systems have permanent damping
Table 3:Frequency, Amplitude response at different properties and cannot be controlled according to the road
loading condition without Magnetic field. profile, whereas the active suspensions systems cover all these
limitations but are not cost effective. Semi active suspension
Loading system using MR dampers is becoming popular because it
Acceleromete frequenc Amplitude(m/s2 Ratio(X/Xst
conditio
n
r Position y ) ) overcomes all the inherent limits of the above two and
Upper X=3.566
combines the advantages of both.These are few important
Zero load 23.200 1.35 applications of MR dampers and a lot of research is being
Lower Xst=2.639
carried out for its potential scope in various fields.
Upper X=3.380
250g 21.400 1.29
Lower Xst=2.615

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 International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS)
Volume VI, Issue XI, November 2017 | ISSN 2278-2540

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