| 摘要 |
A U-shaped bracket supports an elastomeric bush type vibration damping mount on a power unit (ICE plus transmission). The inner tubular member of the damper is mounted on the arms of the bracket by way of a bolt. First and second tubular piezoelectric/electrostrictive strain generating elements are symmetrically disposed about the bolt and housed within the inner tubular member of the mount. A control unit which is responsive to crank angle and engine speed, produces a AC current and applies the same to the first strain generating element. The phase of the same current is shifted by 90 DEG before being applied to the second strain generating element. The voltage and frequency of the AC current are selected in accordance with a predetermined schedule which is based on engine speed and crank angle and which enables the AC currents to be applied in a manner which generate vibrations which tend to negate the vibrations which are transmitted from the power unit to the bolt by way of the arms of the U-shaped bracket.
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