G bodine

Claim 1

ACOUSTIC APPARATUS FOR RADIATING SOUND WAVES INTO A LIQUID BODY, COMPRISING: A SOUND WAVE RADIATOR IMMERSIBLE IN LIQUID AND COMPRISING A RADIATION SURFACE WHICH HAS A DIMENSION ACROSS SUBSTANTIALLY AS GREAT AS A MAJOR FRACTION OF A WAVELENGTH FOR THE SPEED OF SOUND IN THE LIQUID AND AT A PREDETERMINED OPERATING FREQUENCY, AN ELONGATED ELASTIC STRUCTURE LONGITUDINALLY VIBRATORY AT SAID PREDETERMINED OPERATING FREQUENCY IN A LONGITUDINAL STANDING WAVE PATTERN, SAID STRUCTURE BEING DRIVINGLY COUPLED AT ONE END TO SAID RADIATOR, SO AS TO BE LOADED THEREBY AND BY THE LIQUID IN WHICH THE RADIATOR IS IMMERSED, CYCLIC MECHANICAL FORCE GENERATOR MEANS DRIVINGLY COUPLED TO THE OPPOSITE END OF SAID ELONGATED ELASTIC STRUCTURE FOR APPLYING TO SAID STRUCTURE A CYCLIC FORCE ORIENTED LONGITUDINALLY THEREOF AND AT SUBSTANTIALLY SAID PREDETERMINED OPERATING FREQUENCY, THE VIBRATORY SYSTEM COMPRISED OF SAID GENERATOR MEANS, ELASTIC LONGITUDINALLY VIBRATORY STRUCTURE AND LIQUID-IMMERSED RADIATOR BEING RESONANT AT SAID PREDETERMINED OPERATING FREQUENCY, SAID ELONGATED ELASTIC STRUCTURE WHEN VIBRATING AT SAID OPERATING FREQUENCY IN SAID STANDING WAVE PATTERN HAVING A VELOCITY NODE LOCATED SUBSTANTIALLY NEARER ITS END COUPLED TO SAID RADIATOR THAN TO ITS OPPOSITE END, AND HAVING A VELOCITY ANTINODE AT ITS SAID OPPOSITE END, MOTOR MEANS IN COMBINATION WITH SAID CYCLIC FORCE GENERATOR FOR DRIVING SAID CYCLIC FORCE GENERATOR, AND SUPPORTING STRUCTURE FOR SAID MOTOR MEANS CONNECTED TO BUT ACOUSTICALLY ISOLATED FROM SAID ELONGATED ELASTIC VIBRATORY STRUCTURE.