Passive-active vibration isolation
First Claim
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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Accused Products
Abstract
The invention is uniquely "passive-active" in that it brings to bear, sequentially and complementarily, passive vibration control followed by active vibration control. A conventional mount (such as an air mount) is accommodated so as to include, at the mount'"'"'s foundation-securing plate, at least one motion sensor and at least one vibratory actuator. Each sensor is correlated with an actuator. For each sensor-actuator pair, the electrical feedback loop includes generation by the sensor of a signal resulting from the local vibration of the foundation-securing plate, generation by a processor/controller of a signal derived from the sensor'"'"'s signal, and exertion upon the foundation-securing plate by the sensor'"'"'s paired actuator of a vibratory force commanded by the processor/controller'"'"'s signal. Many preferred embodiments of the inventive apparatus, system and method collocate each sensor with its paired actuator and implement a conventional vibration suppression algorithm involving collocated velocity feedback.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus for both passively and actively isolating the vibration of a structure situated over a foundation, said apparatus comprising:
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a spring device which passively reduces the transmission of said vibration from said structure to said foundation, said spring device including an upper member for fixing said spring device with respect to said structure, a lower member for fixing said spring device with respect to said foundation, and a resilient member; a processor/controller; and at least one collocation of a sensor and an actuator wherein, for each said collocation; said sensor and said actuator are each coupled with said lower member so as to be approximately identically located and approximately identically directed; said sensor senses the local vibration in a portion of said lower member and produces an electrical sensor signal commensurate with said local vibration; said processor/controller receives said electrical sensor signal from said sensor and produces an electrical control signal commensurate with said electrical sensor signal; and said actuator receives said electrical control signal from said processor/controller and produces in said portion of said lower member a vibratory force commensurate with said electrical control signal, said vibratory force increasing the stability of said portion of said loser member, said actuator thereby actively reducing the transmission of said vibration from said structure to said foundation whereby, in succession, said spring device passively reduces the transmission of said vibration and said actuator actively reduces the transmission of said vibration. - View Dependent Claims (13, 14, 15, 16, 17)
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18. Method for reducing transmission of vibration of a first entity to a second entity, said method comprising:
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providing a spring assembly which includes a resilient member, an upper securement member and a lower securement member; engaging with said spring assembly a feedback loop system, said engaging including; establishing at least one collocation of a said sensor with a corresponding said vibratory actuator so that said sensor and said corresponding said vibratory actuator are each coupled with said lower securement member at approximately the same location, and so that said sensor senses and said corresponding said vibratory actuator actuates in approximately the same direction and in approximately the same locality of said lower securement member; connecting each said sensor and each said vibratory actuator with a processor/controller so that, for each said collocation, said sensor generates a sensor signal representative of the vibration of said locality, said processor-controller generates a control signal representative of said sensor signal, and said vibratory actuator generates a vibratory force representative of said control signal; and providing power for said feedback loop system; and mounting said first entity with respect to said second entity, said mounting including fastening said first entity with respect to said upper securement member and fastening said second entity with respect to said lower securement member; whereby, in series, said spring assembly effects passive reduction of said vibration at a first plurality of frequencies, then said feedback loop system effects active reduction of said vibration at a second plurality of frequencies, wherein at least one frequency among said second plurality of frequencies is not among said first plurality of frequencies. - View Dependent Claims (19, 20)
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Specification