Importance

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Abstract

An ETVA (electrically-tunable vibration absorber) has a vibratable mass with a mechanical spring suspension supplemented by an electromagnetic spring simulation that can be adjusted electrically to vary the self-resonant frequency of the vibratable mass and tune it to a disturbing frequency that is to be suppressed. A flux path from the electromagnet traverses an air gap between a pair of oppositely-facing matching magnetic pole arrays, one of which is attached to the vibratable mass while the other pole array is substantially attached to the object structure that is being treated to suppress vibration. The two interfacing arrays are configured in mirror-image relationship as seen in cross-section, and are held by the spring suspension so as to be mutually aligned under a quiescent condition and to move relative to each other under vibration only in a designated direction so that the gap separation distance remains substantially constant and thus the flux density at the poles remains substantially constant and unmodulated, resulting in high efficiency due to minimal eddy current losses.

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First Claim