DAMPING OF BEAM TRANSVERSAL VIBRATIONS BY A PERMANENT MAGNET WITH COIL

Abstract eng:
In the paper the use of permanent magnet with coil, augmented by an external resistance, for transversal vibration control of a flexible slender beam is analysed. The magnetic circuit properties are varied due to external harmonic excitation by a rotating machine. The so induced alternating voltage drives alternating current through closed electric circuit, which is dissipated in an external resistor. The induced current driven through the coil generates magnetic force, which damps the excitation force and changes the damped natural frequency of the oscillatory system. The internal losses in the coil influence the overall system performance. A lumped parameter model of the combined system is derived in a simplified, linearised form for a particular machine frame, using measured system parameters and accounting for the coil internal losses.

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