Development of Mathematical Model of Magneto- Rheological Damper
Date
2019-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Pulchowk Campus
Abstract
Dampers are an important part of a vehicle suspension, which dissipate the energy of
the motion of the suspension as thermal energy. A mathematical model can be an
important tool in the understanding and design of a damper. A mathematical model of
a twin tube damper was developed to represent the physical behavior of the damper and
predict the force as a function of velocity. The model has included the provision of
explicitly defining the viscosity of the damper system which will enable the model to
accommodate the changes that may occur in the design. This also enables to calculate
the variation of force with the change of viscosity which is the case of MR dampers.
The model produced results concurrent with that available in literature.
The viscosity change for the MR damper for the change in current excitation applied to
it has been predicted. The results show that when a current of 0.5 A is applied, magnetic
flux of 0.002 T is induced. This results in a viscosity of 0.4 Pa.s. In comparison, the
viscosity of MR fluid not subjected to magnetic field has a typical viscosity of about
0.11 +/- 0.02 Pa.s.
When this viscosity and its variation is applied to the model a 29% increase in damping
force has been calculated, over the range of 0 to 0.5 A, with a maximum of 138 N
obtained for the damper with a mechanical excitation of amplitude 20 mm and
frequency of 2 Hz. The results obtained through the model have been compared with
the experimental results found in literature for validation and the comparison has shown
that the results are appropriate.
Description
Dampers are an important part of a vehicle suspension, which dissipate the energy of
the motion of the suspension as thermal energy. A mathematical model can be an
important tool in the understanding and design of a damper.
Keywords
Citation
MASTER OF SCIENCE IN MECHANICAL SYSTEMS DESIGN AND ENGINEERING