An inverse flextensional projector exhibits a low frequency flexural mode and a higher frequency "breathing" mode to defeat stealthy targets and to conduct short and long range detection and tracking in littoral waters. The device has much broader bandwidth than conventional flextensional transducer
An inverse flextensional projector exhibits a low frequency flexural mode and a higher frequency "breathing" mode to defeat stealthy targets and to conduct short and long range detection and tracking in littoral waters. The device has much broader bandwidth than conventional flextensional transducers, slotted cylinders and conventional cylinder transducers. The device has a low frequency capability similar to slotted cylinder projectors (SCP) but is broader band and does not suffer from the unsupported gap of SCP projectors. The invention has a more uniform radiation velocity than both SCP and flextensional transducers, making it much less susceptible to cavitation limitations.
대표청구항▼
What is claimed is: 1. A flextensional apparatus for use in a flextensional transducer, comprising: a shell having an internal hollow bounded at a top surface and a bottom surface by a concavo--concave arm arrangement, each arm having a first and second end and each of a given thickness, with the t
What is claimed is: 1. A flextensional apparatus for use in a flextensional transducer, comprising: a shell having an internal hollow bounded at a top surface and a bottom surface by a concavo--concave arm arrangement, each arm having a first and second end and each of a given thickness, with the top concave arm and the bottom concavo arm joined at the first end by a common thicker first end portion and each arm joined at the second end by corresponding common thicker second end portion; a plurality of vibratable elements arranged in a stack from a first end to a second end, said stack positioned in the hollow of said shell and extending from one end of the hollow to the other end and positioned along an axis such that said first and second arms are symmetrically disposed with respect to said axis; a first radiator extending in a first direction relatively from the center of said first arm and operably coupled thereto, and a second radiator extending in an opposite direction from the center of said second arm and operably coupled thereto, whereby when said elements vibrate, said arms deform to cause said radiators to alter position according to said deformation, and wherein said first radiator and said second radiator each have a symmetrical mushroom configuration. 2. The apparatus according to claim 1, wherein said shell is formed from a high strength metal. 3. The apparatus according to claim 2, wherein said metal is a high strength, non-magnetic steel. 4. The apparatus according to claim 1, wherein said stack of vibratable elements are ceramic elements. 5. The apparatus according to claim 1, wherein said stack of vibratable elements are magnetostrictive elements. 6. The apparatus according to claim 1, wherein each arm comprises a tab positioned relatively at the center of said arm and extending in a direction normal to the surface of said arm for operably coupling to a corresponding one of said radiators. 7. The apparatus according to claim 6, wherein each radiator comprises a channel for receiving said tab. 8. The apparatus according to claim 1, wherein said radiators are of a T shaped configuration. 9. The apparatus according to claim 1, wherein said radiators are formed from a low density, high stiffness material. 10. The apparatus according to claim 9, wherein said radiator material is a light weight plastic. 11. The apparatus according to claim 1, wherein said flextensional transducer comprises a plurality of said flextensional shells arranged in a stacked configuration along a common axis from a first to a second end. 12. The apparatus according to claim 1, wherein said flextensional apparatus can operate in a first or second vibration mode. 13. The apparatus according to claim 12, wherein said first mode is a flextensional mode. 14. The apparatus according to claim 13, wherein said second mode is a breathing mode. 15. The apparatus according to claim 1, wherein the thickness and dimensions of the shell are selected to produce vibrations in the range between 400 Hz to 400 KHz. 16. The apparatus according to claim 1, wherein said flextensional shell is monolithically formed. 17. The apparatus according to claim 1, wherein said stack of vibratable elements includes means for applying operating potential to said elements to cause said elements to vibrate. 18. The apparatus according to claim 17, wherein said means are operative to provide electrical signals when said stack is vibrated by acoustical waves. 19. A flextensional transducer comprising: a drive assembly comprising a stack of one or more vibratable elements responsive to an alternating power source; a flextensional shell having an internal hollow for accommodating said drive assembly, said shell having first and second bulbous end portions, each adapted to receive a corresponding end of the drive assembly, and a concavo-concave arm arrangement, each arm having a first and second end terminating at a respective one of said bulbous end portions, thereby defining said hollow, and a first radiator extending in a first direction relatively from the center of said first arm and operably coupled thereto, and a second radiator extending in an opposite direction relatively from the center of said second arm and operably coupled thereto, wherein said first radiator and said second radiator each have a symmetrical mushroom configuration, whereby when said elements vibrate, said arms deform to cause said first and second radiators to alter position according to said deformation. 20. The flextensional transducer of claim 19, wherein said transducer is operable in a first flextensional mode associated with a first relatively operating frequency and a second breathing mode associated with a second relatively high operating frequency. 21. The flextensional transducer of claim 20, wherein each arm comprises a projecting tab positioned relatively at the center of said arm and extending in a direction normal to the surface of said arm for operably coupling to a corresponding one of said radiators. 22. The flextensional transducer of claim 21, wherein each radiator comprises a channel for receiving said corresponding tab. 23. The flextensional transducer of claim 22, further comprising means for fastening each of said first and second radiators to a respective one of said arms via the corresponding channel and tab. 24. A flextensional apparatus for use in a flextensional transducer, comprising: a shell having an internal hollow bounded at a top surface and a bottom surface by a concavo--concave arm arrangement, each arm having a first and second end and each of a given thickness, with the top concave arm and the bottom concavo arm joined at the first end by a common thicker first end portion and each arm joined at the second end by corresponding common thicker second end portion; and a pair of projecting tabs extending from substantially the midpoint of each of the concavo and concave arms in opposite direction along a longitudinal axis thereof, each tab adapted for engaging a corresponding radiator to generate vibrational motion in response to deformation of said shell. 25. The flextensional apparatus of claim 24, wherein each tab is insertable into a corresponding channel of a T-shaped radiator. 26. The flextensional apparatus of claim 25, wherein each tab includes a plurality of through holes for alignment with corresponding through holes in sides defining the corresponding channel of said T-shaped radiator. 27. The flextensional apparatus of claim 24, wherein a stack of vibratory elements are disposed within the hollow of said shell and operably coupled to said first and second thicker end portions, and wherein each of the arms of said shell deform to a convex section at the midpoint of said arm, and concave sections at adjacent portions along said arm, in response to biasing said vibratory elements. 28. The apparatus according to claim 1, wherein each of said radiators comprises a planar support portion and a bulbous head segment. 29. The apparatus according to claim 28, wherein said bulbous head segments comprise hollow shells. 30. The apparatus according to claim 28, wherein said bulbous head segments extend substantially the length of said concave arms. 31. The apparatus according to claim 9, wherein each of said radiators comprises a hollow shell defining a planar support portion and a bulbous head segment.
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이 특허에 인용된 특허 (8)
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