磁性流体液柱の振動特性 : (過渡応答からの推定)

概要

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Magnetic fluids are known as a typical example of functional fluids in the magnetic field. Fundamental studies are conducted to develop engineering devices, in which the motion of magnetic fluid column is utilized. Since the oscillating characteristics should be crucial for the device performance, the motion of the liquid column in a U-tube is observed using step response method. In the experimental work, the effects of the magnetic field strength and the position of the column surface on the damping characteristics are examined for a variety of conditions. The damping ratio that is used in the case of forced vibration increases with the magnetic field strength. The natural frequency with damping oncreases with the magnetic field intensity and with the rise of the fluid column position. Numerical calculation is also carried out using conditions similar to the experiment. The predicted results agree qualitatively with measured values.
2000-08-25