IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0414518
(2006-04-28)
|
등록번호 |
US-7535801
(2009-07-01)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Lockheed Martin Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
5 |
초록
▼
A sonar transducer has a head mass at a distal end thereof, a tail mass at a proximal end thereof, a driver in physical contact with the head mass and the tail mass, and a flextensional body incorporating and extending proximally from the head mass. The flextensional body has relatively thin walls o
A sonar transducer has a head mass at a distal end thereof, a tail mass at a proximal end thereof, a driver in physical contact with the head mass and the tail mass, and a flextensional body incorporating and extending proximally from the head mass. The flextensional body has relatively thin walls or diaphragms with concave surfaces. The sonar transducer may have a fundamental mode having a relatively low resonant frequency, involving substantially only a bending motion of the diaphragms. A second resonant mode, at a frequency higher than the frequency associated with the fundamental mode, involves both a bending motion of the diaphragms and a membrane or breathing motion of the flextensional body, including the head mass. A third, relatively high frequency resonant mode, involves exclusively or substantially exclusively longitudinal motion of the head mass.
대표청구항
▼
What is claimed is: 1. A sonar transducer comprising: a head mass at a distal end thereof, a tail mass at a proximal end thereof, a driver in physical contact with the head mass and the tail mass, and an inverse flextensional body incorporating and extending proximally from the head mass, wherein s
What is claimed is: 1. A sonar transducer comprising: a head mass at a distal end thereof, a tail mass at a proximal end thereof, a driver in physical contact with the head mass and the tail mass, and an inverse flextensional body incorporating and extending proximally from the head mass, wherein said inverse flextensional body includes vertical and parallel end walls joined by a pair of concave upper and lower diaphragms. 2. The transducer of claim 1 wherein said inverse flextensional body includes one end wall defined by the head mass, a second end wall defined by a walled end region and walls on opposite sides having a concave shape and joining the head mass and the second end wall. 3. The transducer of claim 2, wherein said one end wall comprises a planar surface. 4. The transducer of claim 1, wherein an aft section includes said tail mass at a proximal end thereof, said aft section mating at a distal end with said flextensional body, and wherein said aft section includes side walls having a relative stiffness greater than the stiffness of said head mass and said diaphragms. 5. A sonar transducer comprising: a head mass at a distal end thereof, a tail mass at a proximal end thereof, a driver in physical contact with the head mass and the tail mass, and an inverse flextensional body incorporating and extending proximally from the head mass, wherein an aft section includes said tail mass at a proximal end thereof, said aft section mating at a distal end with said flextensional body, and wherein said aft section includes side walls having a relative stiffness greater than the stiffness of said head mass and said diaphragms, and wherein said transducer is operative in one of a first relatively low frequency resonant mode defined by only a bending motion of said flextensional body in response to a driving signal; a second relatively higher frequency resonant mode higher than the frequency associated with the first mode, defined by a bending motion of the diaphragms and a radial motion of the flextensional body in response to a second driving signal; and a third high frequency resonant mode higher than that of said first and second modes, defined by a substantially exclusively longitudinal motion of the flextensional body, in response to a third driving signal. 6. The transducer of claim 5, wherein said first mode is below about 1 KHz, said second mode is about 1.5 KHz, and said third mode is about 2.2 KHz to 3.7 KHz. 7. A sonar transducer comprising: an inverse flextensional body having a longitudinal axis and including a head mass, said flextensional body extending proximally of the head mass; an aft section in alignment along said longitudinal axis and matingly coupled with said inverse flextensional body at a distal end, and including a tail mass at a proximal end thereof, said aft section having a diameter smaller than the dimensions of a front planer surface of said head mass; a driver in physical contact with the head mass and the tail mass; wherein the inverse flextensional body has a pair of substantially concave cross-sectional shaped opposing side diaphragms in a direction orthogonal to the longitudinal axis; and wherein a rear housing is attached to said tail mass. 8. The transducer of claim 7, wherein said inverse flextensional body further comprises side plates to seal the interior open sides of the flextensional body. 9. The transducer of claim 7, wherein said diaphragms are disposed about an interior head chamber. 10. The transducer of claim 7, wherein a wall proximal of the diaphragms joins the distal ends of the diaphragms to a cylindrical barrel section that mates with the aft section. 11. The transducer of claim 7, wherein the ratio of the tail mass to the head mass is approximately 5 to 1. 12. A sonar transducer comprising: a flextensional body having a head mass, a tail mass, opposing diaphragms, a wall, and a barrel section forming a unitary structure; an aft section having a hollow cylinder defining therein an interior chamber which is open at its distal end and continuous with an opening in a wall to an interior head chamber of said flextensional body, said opposing diaphragms located about said interior head chamber, and a driver in physical contact with the head mass and the tail mass and housed within said aft section, wherein said driver changes its longitudinal length in accordance with a driven frequency. 13. The transducer of claim 12, wherein the driver is one of a stack of piezoelectric rings or magnetostrictive material. 14. The transducer of claim 12, wherein the driver produces oscillatory magnetic fields at one or more selected vibratory frequencies. 15. The transducer of claim 12, wherein the driver is made of one of a lead-zirconate-titanate ceramic, terfenol-D or other electrostrictive, magnetostrictive, piezoceramic or piezomagnetic solid state material. 16. The transducer of claim 12, further comprising insulators provided at each end of the driver to provide electrical insulation between the driver and the head mass, and the driver and the tail mass. 17. The transducer of claim 16, wherein the insulators include a tuning washer. 18. The transducer of claim 12, wherein a drive point impedance of the transducer structure is less than the drive point impedance of the driver. 19. The transducer of claim 12, wherein the unitary structure and aft section materials reflect differential stiffness. 20. The transducer of claim 12, wherein said flextensional body includes vertical and parallel end walls joined by said opposing diaphragms, said opposing diaphragms being substantially concave.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.