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N o v e m b e r 1 2 - 1 3 , 2 0 1 8 | R o m e , I t a l y
Joint Event on
OF EXCELLENCE
IN INTERNATIONAL
MEETINGS
YEARS
&
CHROMATOGRAPHY AND SEPARATION SCIENCE
World Congress on
SATELLITE AND SPACE MISSIONS
International Conference and Exhibition on
Chromatography 2018 & Satellite 2018 Journal of Chemical Technology and Applications| Volume 2
Milad Azimi et al., J Chem Tech App 2018, Volume 2
DEVELOPMENT AND IDENTIFICATION OF
A FULL-DETAILED FRICTION MODEL OF
REACTION WHEEL
Milad Azimi, Ghasem Sharifi and Alireza Alikhan
Aerospace Research Institute (Ministry of Science, Research and Technology), Iran
The ever-increasing use of satellites demands a search for increasingly ac-
curate and reliable pointing systems. Reaction Wheels are rotating devic-
es used commonly for the attitude control of the spacecraft since provide a
wide range of torque magnitude and high reliability. The numerical modeling
of this device can significantly enhance the accuracy of the satellite control
in space. Modeling the wheel rotation in the presence of the various frictions
is one of the critical parts of this approach. This paper presents a Dynamic
Model Control of a Reaction Wheel (DMCR) in the current control mode. In
current-mode the required current is delivered to the coils in order to achieve
the desired torque. During this research, all the friction parameters as viscous
and coulomb, motor coefficient, resistance and voltage constant are iden-
tified. In order to model identification of a reaction wheel, numerous vary-
ing current commands apply on the particular wheel to verify the estimated
model. All the parameters of DMCR are identified by Batch Gradient Descent
(BGD) optimization method. The experimental results demonstrate that the
developed model has an appropriate precise and can be used in the satellite
control simulation.
Milad Azimi is currently a faculty member in the Aero-
space Research Institute (Ministry of Science, Research
and Technology) and part of the system architecture
team for a CubeSat satellite program with more than 10
years’ experience in mechanical and aerospace engineer-
ing. He has extensive experience in various aspects of
spacecraft design and systems engineering. Successful
contribution in quality management, project manage-
ment, product-development life cycle methodologies. Dr.
Azimi specializes in spacecraft and subsystem design,
system analysis and modeling. His research interests are
dynamics and control of space vehicles, robust control,
nonlinear systems, smart structure and materials, vibra-
tion control, micro/nano satellite design and structural
dynamics and experimental dynamics.
BIOGRAPHY