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US 8,499,907 B2Granted
Piezoelectric liquid inertia vibration eliminator
AssigneeBell Helicopter Textron Inc.
InventorsMichael R. Smith, Frank B. Stamps, Taeoh Lee, David E. Heverly, Jr., Robert J. Pascal
Life of this patent
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Abstract
A tunable vibration isolator with active tuning elements having a housing, fluid chamber, and at least one tuning port. A piston is resiliently disposed within the housing. A vibration isolation fluid is disposed within the fluid chambers and the tuning ports. The tunable vibration isolator may employ either a solid tuning mass approach or a liquid tuning mass approach. The active vibration elements are preferably solid-state actuators.
Claims2
A dual frequency vibration absorber comprising:
- a housing;
- a first piston resiliently disposed within the housing, the first piston being adapted for connection to a first body;
- a first fluid chamber and a second fluid chamber, each being defined by the housing, and the first piston;
- a first tuning port in continually unobstructed fluid communication with both the first fluid chamber and the second fluid chamber, the first tuning port is fixed to the housing;
- a second tuning port in fluid communication with both the first fluid chamber and the second fluid chamber, the second tuning port in continuous parallel operation with the first tuning port;
- and
- a tuning fluid disposed within the first fluid chamber, the second fluid chamber, the first tuning port, and the second tuning port;
- wherein the first tuning port allows isolation of harmonic vibration at a first selected frequency, the isolation of harmonic vibration at the first selected frequency being a result of displacement of the tuning fluid in the first tuning port, the displacement being a result of movement of the piston;
- wherein the second tuning port allows isolation of vibration at a second selected frequency, the isolation of vibration at the second selected frequency being a result of displacement of the tuning fluid in the second tuning port, the displacement being a result of a movement of the piston;
- wherein the movement of the piston displaces the tuning fluid in both the first tuning port and the second tuning port.
7 more elements
Dependencies are inferred from the claim text.