In this paper, the multiple current flowing electromagnetic shunt damper was newly employed for the semi-active
vibration suppression of the flexible structures. The electromagnetic shunt damper consists of a coil and a permanent
magnet. The ends of the coil were connected to the multimode current flowing electromagnetic shunt circuit for vibration
reduction of the cantilever beam employing energy dispersion method. The system was electro-magneto-mechanically
coupled between the electrical circuit and mechanical vibrating cantilever beam with a electromagnetic transducer. The
circuits were designed for first two mode control of the cantilever. The vibration and damping characteristics of the
flexible beams with the electromagnetic shunt damper were investigated by tuning the circuit parameters. The effect of
the magnetic intensity on the shunt damping was studied with the variation of the gap between the aluminum beam and
the permanent magnet. The resistances of the shunt circuit were used to investigate vibration damping effect of
cantilever. The theoretical prediction of frequency response of the beam under multiple mode electromagnetic shunt
damping method has a good agreement with experimental results. Present results show that the magnet shunt damper can
be successfully applied to reduce the vibration of the flexible structures.
KEYWORDS: Actuators, Electromagnetism, Copper, Control systems, Magnetism, Active vibration control, Vibration control, Sensors, Digital signal processing, Beam shaping
The magnet-coil was used for a passive eddy current damper and an electromagnetic actuator to suppress the vibration of
cantilever beams. The magnet-coil system consists of a copper coil attached to the aluminum beam and a permanent
magnet installed below the coil, and this conductive coil can be used passively and actively as a damper and an actuator.
The effect of the coil shapes including a cylindrical tube, a square tube and a circular sheet was investigated to find an
efficient magnet-coil system for the vibration suppression of the cantilever beams. Also, the results of the active control
with a positive position feedback scheme were compared with those of the passive eddy current dampers with open and
closed circuits. The experimental data showed that the tube type coils had much higher vibration suppression efficiency
than the sheet type coil and the active vibration control strategy can be alternatively used to improve the electromagnetic
damper system.
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