Active force cancellation system
First Claim
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1. An active force cancellation system for controlling vibrations in flexible structures, said system comprisinga vibration sensing means located on said flexible structurecounter-vibration means located on said flexible structurecontroller means operatively associated with said vibration sensing means and said counter-vibration means and adapted to cause the latter to vibrate in response to signals from the sensing means so as to eliminate vibrations in said flexible structure.
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Abstract
An active force cancellation system adapted to contain vibrations in flexible structures which utilizes co-located vibration sensors and counter-vibration devices to offset linear disturbances without setting off sub-structure vibrations.
90 Citations
15 Claims
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1. An active force cancellation system for controlling vibrations in flexible structures, said system comprising
a vibration sensing means located on said flexible structure counter-vibration means located on said flexible structure controller means operatively associated with said vibration sensing means and said counter-vibration means and adapted to cause the latter to vibrate in response to signals from the sensing means so as to eliminate vibrations in said flexible structure.
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5. An active force cancellation system adapted to contain vibrations in flexible structure being acted upon by a disturbance, said system comprising
a vibration sensor means mounted on said structure and co-located at the disturbance input point so as not to affect the structures modes, a counter-vibration means mounted on said structure and also co-located at said disturbance, controller means operatively associated with said vibration sensor and counter-vibration means and adapted to cause the latter to vibrate in response to signals from the sensor to thereby eliminate vibrations in said structure without setting off sub-structure vibrations.
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8. An active force cancellation system for controlling vibrations of various modes occurring along a line of action in structures, said system comprising
a vibration sensing means located on said structure, counter-vibration means located on said structure, said counter-vibration means so located on said structure so as to have its axis of movement parallel to and less than one quarter of the wavelength of the highest order mode being controlled, controller means operatively associated with said vibration sensing means and said counter-vibration means and adapted to cause the latter to vibrate in response to signals from the sensing means so as to eliminate vibrations in said structure.
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12. An active force cancellation system adapted to contain vibrations in flexible structures being acted upon by a disturbance along a line of action, said system comprising
a vibration sensor means mounted on said structure and co-located at the disturbance input point so as not to affect the structures modes, a counter-vibration means mounted on said structure and also co-located at said disturbance, controller means operatively associated with said vibration sensor and counter-vibration means and adapted to cause the latter to vibrate in response to signals from the sensor to thereby eliminate vibrations in said structure without setting off sub-structure vibrations.
Specification