The purpose of this study is to design a structure of a linear-motion
type semi-active damper which can reduce the vibration caused by an
earthquake. This paper proposes the more effective structure of the
linear motion semi-active damper by magnetic-structure interaction
analysis of finite element method using ANSYS. The semi-active damper
has a simple structure that a linear mover, a magnet bar, reciprocates
in coils of a stator. The size of the coils and the size of the magnetic
material cover which can produce the maximum damping force are
simulated under the condition that the size of the mover is fixed. The
electromotive force is calculated based on the change of the produced
magnetic field according to the change of the given velocity of the
mover in a short time. The damping force is calculated according to the
electric current which the electromotive force supplies to the connected
resistance. By the simulations, more than 120 [N s/m] of the maximum
damping coefficient is acquired in the case that the coil is wound up
from 28.0[mm] of the inner diameter to 60.0 [mm] of the outer diameter.
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This study received no specific financial support.
The authors declare that they have no competing interests.
All authors contributed equally to the conception and design of the study.