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Active vibration control device

  • US 5,170,103 A
  • Filed: 05/20/1991
  • Issued: 12/08/1992
  • Est. Priority Date: 05/20/1991
  • Status: Expired due to Fees
First Claim
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1. Apparatus for actively controlling vibration in a cantilevered member having a longitudinal axis comprising:

  • a) a sensor mounted near the free end of the member to measure motion of the member in a transverse direction and to produce a corresponding signal;

    b) a force generating assembly mounted to the member near the free end to oppose the measured motion with a force thereby minimizing subsequent motion along the transverse axis caused by vibration, said assembly comprised of;

    i) a solid mass attached to the member near the free end and displaceable from an initial position such that when displaced the resulting acceleration of the mass generates a force upon the member;

    ii) an actuator to act upon and displace the mass from the initial position;

    iii) means for receiving and interpreting the sensor signal and activating the actuator to displace the mass at an acceleration which is a function of the sensor signal; and

    iv) means for returning the mass toward the initial position.

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