Feedback enhanced adaptively tuned vibration absorber
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United States of America Patent
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-
Jul 6, 1999
Grant Date -
N/A
app pub date -
Nov 15, 1995
filing date -
Nov 15, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus has a mass suspended between two mounting plates by a separate springs to form a resonant structure that absorbs vibration in a structural member to which the mounting plates are attached. Permanent magnets are fixed to opposite sides of the mass. A sensor produces a signal indicating the frequency of the vibration. A feedback circuit receives the signal from the sensor and produces an output signal having first component frequency which corresponds to a harmonic of the frequency of the vibration. The output signal is applied to a separate voice coil adjacent to each permanent magnet. The magnetic fields produced by the output signal flowing through the voice coils interact with the magnetic fields from the permanent magnets to generate forces that act on the mass in a manner that increases the impedance of the absorber to the vibration in the structural member.
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