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Passive-active vibration isolation

  • US 5,899,443 A
  • Filed: 10/22/1996
  • Issued: 05/04/1999
  • Est. Priority Date: 10/22/1996
  • Status: Expired due to Fees
First Claim
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1. A vibration isolation system, said vibration isolation system being for reducing transmission of vibration of a first entity to a second entity, said vibration isolation system comprising:

  • a spring assembly for effectuating global passive vibration control; and

    a feedback loop system for effectuating localized active vibration control, subsequent to said effectuating of said global passive vibration control;

    said spring assembly including;

    a first securement member, for securing said spring assembly with respect to said first entity;

    a second securement member, for securing said spring assembly with respect to said second entity; and

    an interposed resilient member having the quality to passively reduce transmission of vibration in at least a first frequency bandwidth; and

    said feedback loop system including;

    a sensor, coupled with said second securement member, which generates a sensor signal which is a function of the vibration in a localized control area of said second securement member;

    a PID-type controller which generates a control signal which is a function of said sensor signal; and

    an actuator, coupled with said second securement member, which generates, in said localized control area, a vibratory force which is a function of said control signal, so as to actively reduce transmission of vibration in at least a second frequency bandwith, wherein said second frequency bandwidth differs from said first frequency bandwidth;

    said sensor and said actuator being collocated whereby said sensor and said actuator are approximately coincident and whereby the sensing of said sensor and the actuation of said actuator are approximately in the same direction.

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