| 摘要 |
PCT No. PCT/EP95/02899 Sec. 371 Date Jun. 18, 1997 Sec. 102(e) Date Jun. 18, 1997 PCT Filed Jul. 20, 1995 PCT Pub. No. WO96/03224 PCT Pub. Date Feb. 8, 1996An 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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