Email this article and Applied Mechanics
56, 3, pp. 571-583, Warsaw 2018
DOI: 10.15632/jtam-pl.56.3.571
Stiffness and damping characteristics of MR fluid-based sandwich beams: experimental study
magnetorheological fluids (MRFs) differing in the iron particle content by volume. Outer
layers are made of aluminium, the space between them is sealed with silicone rubber. Two
types of beams are considered: fully filled beams and partially filled beams, subjected to the
magnetic field. The aim of the study is to determine stiffness and damping characteristics
in relation to the magnetic field strength and the actual location where the magnetic field
acts upon the beam. For this purpose, measurements have been taken of the beam free
vibration response for various magnetic field strength levels and for various positions of
the electromagnet located along the beam axis. Basing on the developed measurement data
processing algorithm, the influence of the vibration amplitude on the natural frequency and
a dimensionless damping coefficient have been determined. Finally, the equivalent natural
frequency and the dimensionless damping coefficient have been derived accordingly, and the
stiffness and damping ratio have been determined in function of the magnetic field strength,
the electromagnet position and the MRF iron particle content by volume.
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