In this technical brief, the authors compare the torque capacity of a magnetorheological (MR) fluid brake with a conventional frictional disk brake. In the development of the torque models for both brakes, a mathematical expression for the compared torque ratio is presented. For the frictional disk brake, constant pressure and constant wear theories are considered, while static torque of the MR fluid brake is considered for comparison purpose only. Throughout the analysis, the outer radius of the compared brakes is assumed to be the same to ensure similarity of size, while the inner radius is selected to achieve maximum values of braking torque for both brake designs. Reasonable values of design variables for each brake are obtained from references and adopted in this study for making comparisons between the two designs. In conclusion, it is shown that the torque capacity for a frictional disk brake is 10–18 times greater than the torque capacity for a MR fluid brake of similar size.

References

References
1.
Li
,
W. H.
, and
Du
,
H.
,
2003
, “
Design and Experimental Evaluation of Magnetorheological Brake
,”
Int. J. Adv. Manuf. Technol.
,
21
(
7
), pp.
508
515
.
2.
Haung
,
J.
,
Zhang
,
J. Q.
,
Yang
,
Y.
, and
Wei
,
Y. Q.
,
2002
, “
Analysis and Design of a Cylindrical Magneto-Rheological Fluid Brake
,”
J. Mater. Process. Technol.
,
129
(
1–3
), pp.
559
562
.
3.
Duan
,
Y. F.
,
Ni
,
Y. Q.
, and
Ko
,
J. M.
,
2006
, “
Cable Vibration Control Using Magnetorheological Dampers
,”
J. Intell. Mater. Syst. Struct.
,
17
(
4
), pp.
321
325
.
4.
Kikuchi
,
T.
,
Oda
,
K.
, and
Furusho
,
J.
,
2010
, “
Leg-Robot for Demonstration of Spastic Movements of Brain-Injured Patients With Compact Magnetorheological Fluid Clutch
,”
Adv. Rob.
,
24
(
5–6
), pp.
671
686
.
5.
Chen
,
J. Z.
, and
Liao
,
W. H.
,
2010
, “
Design, Testing, and Control of Magnetorheological Actuator for Assistive Knee Braces
,”
Smart Mater. Struct.
,
19
(
3
), p.
035029
.
6.
Ostermeyer
,
G. P.
,
2001
, “
Friction and Wear of Brake Systems
,”
Forsch. Ingenieurwes.
,
66
(
6
), pp.
267
272
.
7.
Junior
,
M. T.
,
Gerges
,
S. N.
, and
Jordan
,
R.
,
2008
, “
Analysis of Brake Squeal Noise Using the Finite Element Method: A Parametric Study
,”
Appl. Acoust.
,
69
(
2
), pp.
147
162
.
8.
Von Wagner
,
U.
,
Hochlenert
,
D.
,
Jearsiripongkul
,
T.
, and
Hagedorn
,
P.
,
2004
, “Active Control of Brake Squeal Via ‘Smart Pads’,”
SAE
Paper No. 2004-01-2773.
9.
Rossa
,
C.
,
Jaegy
,
A.
,
Lozanda
,
J.
, and
Micaelli
,
A.
,
2014
, “
Design Considerations for Magnetorheological Brakes
,”
IEEE/ASME Trans. Mechatronics
,
19
(
5
), pp.
1669
1680
.
10.
Lee
,
D.
, and
Wereley
,
N. M.
,
2000
, “
Analysis of Electro- and Magneto-Rheological Flow Mode Dampers Using Herschel-Bulkley Model
,”
Proc. SPIE
,
3989
(
1
), pp.
244
255
.
11.
Lindler
,
J.
, and
Wereley
,
N. M.
,
2003
, “
Quasi-Steady Bingham Plastic Analysis of an Electrorheological Flow Mode Bypass Damper With Piston Bleed
,”
Smart Mater. Struct.
,
12
(
3
), pp.
305
317
.
12.
Kikuchi
,
T.
, and
Kobayashi
,
K.
,
2011
, “
Development of Cylindrical Magnetorheological Fluid Brake for Virtual Cycling System
,”
IEEE International Conference on Robotics and Biomimetics
(
ROBIO
), Phuket, Thailand, Dec. 7–11, pp.
2386
2392
.
13.
Shiao
,
Y. J.
, and
Chang
,
C. Y.
,
2011
, “
Design of an Innovative High-Torque Brake
,”
Adv. Mater. Res.
,
339
, pp.
84
87
.
14.
Nikitczuk
,
J.
,
Weinberg
,
B.
, and
Mavroidis
,
C.
,
2007
, “
Control of Electro-Rheological Fluid Based Resistive Torque Elements for Using in Active Rehabilitation Devices
,”
Smart Mater. Struct.
,
16
(
2
), pp.
418
428
.
15.
Norton
,
R. L.
,
Machine Design: An Integrated Approach
,
3rd ed.
,
Upper Saddle River
,
NJ
.
16.
LORD Technical Data, 2008, “MRF-140CG Magneto-Rheological Fluid,” LORD Corporation, Cary, NC, accessed Feb. 9, 2018, http://www.lordmrstore.com/lord-mr-products/mrf-140cg-magneto-rheological-fluid
You do not currently have access to this content.