Abstract
Basic theoretical and experimental studies are made on the behaviour of a magnetic fluid plug oscillating in a straight pipe with an exciting periodic magnetic field as a simple example of the magnetic fluid plug actuators. Assuming that a pipe friction coefficient in a magnetic field with oscillating motion is constant, the theoretical analysis shows good agreement with the experimental results. The maximum amplitude of vibration increases almost linearly with fluid plug length within the experimental range. However, the maximum fluid length is restricted by the effective region of the magnetic field, which also restricts the maximum amplitude of vibration.
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