A method of controlling the acoustic radiation of a ship

• Main Authors: STAMPS, FRANK B, LEE, TAEOH, SMITH, MICHAEL R, PASCAL, ROBERT J, HEVERLY, DAVID E. JR
• Format: Patent
• Language: English; French; German
• Published: 06.08.2014
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; AEROPLANES; AIRCRAFT; AVIATION; BLASTING; COSMONAUTICS; ENGINEERING ELEMENTS AND UNITS; EQUIPMENT FOR SHIPPING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HELICOPTERS; LIGHTING; MARINE PROPULSION OR STEERING; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; PERFORMING OPERATIONS; PHYSICS; RELATED EQUIPMENT; SHIPS OR OTHER WATERBORNE VESSELS; SHOCK-ABSORBERS; SOUND-PRODUCING DEVICES; SPRINGS; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

A vibration isolator comprising: a piston (1605) resiliently disposed within a housing (1603) with a first set of seals (1607); a mount plate (1609) configured for attachment to a vibrating body, the piston being connected to the mount plate; an upper fluid chamber (1611) and a lower fluid chamber (1613), each being defined by the housing, the piston, and the first set of seals; a tuning port (1620) for fluid communication between the upper fluid chamber and the lower fluid chamber; a tuning fluid disposed within the upper fluid chamber, the lower fluid chamber, and the tuning port; and a piezo piston (1619) resiliently disposed with the housing, the piezo piston being configured to be driven by at least two piezoceramic actuators (1623).