VIBRATION ISOLATION SYSTEM
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Abstract
A VIBRATION ISOLATION SYSTEM FOR MECHANICALLY COUPLING A MASS TO A SOURCE OF VIBRATORY ENERGY, WHILE REDUCING TRANSMISSIBILITY OF THE VIBRATING ENERGY TO THE MASS. THE SYSTEM IS A HYBRID DEVICE, COMBINING BOTH PASSIVE AND ACTIVE ISOLATION APPARATUS FOR PRODUCING ISOLATION OVER A PRESCRIBED FREQUENCY RANGE OF THE GENERATED VIBRATIONS, WHILE PERMITTING THE MASS TO BE RIGIDLY COUPLED TO THE SOURCE FOR FREQUENCIES BELOW THE ISOLATION RANGE. THE HYBRID SYSTEM HAS PARTICULAR APPLICATION IN A HELICOPTER TO COUPLE THE FUSELAGE TO THE ROTOR, PRODUCING ISOLATION WITH RESPECT TO VIBRATIONS ABOVE THE HELICOPTER CONTROL FREQUENCY RANGE.
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