Apparatus and method for reducing transverse vibrations in unbalanced-mass vibrators
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United States of America Patent
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Jun 15, 1999
Grant Date -
N/A
app pub date -
Jun 18, 1997
filing date -
Jul 21, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An unbalanced-mass vibrator comprises a pair of unbalanced masses which are sequentially driven in opposite rotational directions. The vibrators are intended to provide vibrations in a vibrational direction, and undesired vibrations transverse to the vibrational direction are reduced or eliminated. In particular, mechanisms in control schemes are provided for adjusting the relative torques delivered to each of the unbalanced masses via hydraulic motors. The torques, in turn, may be controlled based on the degree to which the unbalanced masses are out of synchronization or by measurically measuring vibrations in a transverse direction to the desired vibrational direction, or time derivative thereof.
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