The Invention is a reinforced plastic sonar dome having a low acoustical insertion loss combined with sufficient mechanical strength. Acoustical and structural fibers are stochastically mixed and formed into a blended yarn. The blended yarn is woven into a blended fabric. The blended fabric is orde
The Invention is a reinforced plastic sonar dome having a low acoustical insertion loss combined with sufficient mechanical strength. Acoustical and structural fibers are stochastically mixed and formed into a blended yarn. The blended yarn is woven into a blended fabric. The blended fabric is ordered into a stack having multiple layers of blended fabric. The blended fabric is incorporated into a polymer resin while the polymer resin is in liquid form using a vacuum assist. The acoustical fibers and the vacuum assist modify the acoustical properties of the resulting composite sonar dome.
대표청구항▼
I claim: 1. A sonar dome to cover transducers of a sonar system of a vessel, the sonar dome comprising: a. a solidified polymer resin, said solidified polymer resin defining an interior volume, said interior volume being configured to cover said transducers; b. a substantially stochastic mixture of
I claim: 1. A sonar dome to cover transducers of a sonar system of a vessel, the sonar dome comprising: a. a solidified polymer resin, said solidified polymer resin defining an interior volume, said interior volume being configured to cover said transducers; b. a substantially stochastic mixture of a plurality of acoustical fibers and a plurality of structural fibers, said stochastic mixture of said plurality of acoustical fibers and said plurality of structural fibers being imbedded within said solidified polymer resin, said acoustical fibers being selected to have a predetermined acoustical characteristic, said structural fibers being selected to have a predetermined structural characteristic. 2. The sonar dome of claim 1 wherein said predetermined acoustical characteristic of said plurality of said acoustical fibers comprises: a one of said plurality of said acoustical fibers having an acoustical fiber speed of sound for a sound of a selected frequency propagating through said acoustical fiber, a one of said plurality of said structural fibers having a structural fiber speed of sound for said sound of said selected frequency propagating through said structural fiber, an absolute value of a difference between said acoustical fiber speed of sound and a speed of sound for said sound of said selected frequency propagating through water being less than said absolute value of said difference between said structural fiber speed of sound and said speed of sound for said sound of said selected frequency propagating through said water. 3. The sonar dome of claim 2 wherein the sonar dome has a predetermined design sound wavelength, said acoustical fibers having an acoustical fiber quantity, said structural fibers having a structural fiber quantity, said blended fabric having a predetermined ratio of said acoustical fiber quantity to said structural fiber quantity, said predetermined ratio being selected based upon said pre-determined design sound wavelength. 4. The sonar dome of claim 3 wherein said substantially stochastic mixture of said plurality of acoustical fibers and said plurality of structural fibers is arrayed in a blended yarn, said blended yarn is incorporated in a woven blended fabric, said blended fabric being imbedded within said solidified polymer rosin. 5. The sonar dome of claim 4 wherein said blended fabric is one of a plurality of said blended fabrics, the sonar dome further comprising: said plurality of said blended fabrics being formed into a multiple-layered stack of said blended fabrics, said stack of said blended fabrics being imbedded within said solidified polymer resin. 6. The sonar dome of claim 5 wherein each of said plurality of said Wended fabrics within said stack has a one of a plurality of said ratios of said acoustical fiber quantity to said structural fiber quantity, said one of said plurality of said ratios being selected based upon a pre-determined design wavelength of said sound. 7. The sonar dome of claim 6 wherein said predetermined ratio of said acoustical fibers to said structural fibers for a one of said plurality of said blended fabrics is determined by a location of said one of said plurality of blended fabrics within said stack of said blended fabrics. 8. The sonar dome of claim 7 wherein said sonar dome has an inside surface and an outside surface, said ratio of said acoustical fiber quantity to said structural fiber quantity for said woven fabric proximal to said inside surface is greater than said ratio for said woven fabric distal to said inside and said outside surfaces, and said ratio of said acoustical fiber quantity to said structural fiber quantity for said woven fabric proximal to said outside surface is grater than said ratio for said woven fabric distal to said inside and said outside surfaces. 9. The sonar dome of claim 8 wherein said structural fiber is selected from a list consisting of carbon fiber, aramid and glass. 10. The sonar dome of claim 8 wherein said solidified polymer resin is a high-elongation resin. 11. The sonar dome of claim 8 wherein said acoustical fiber is selected from a list consisting of ultra-high molecular weight polyethylene fiber and polyester fiber. 12. The sonar dome of claim 1, said predetermined acoustical characteristic of said plurality of said acoustical fibers comprising: said acoustical fibers having a speed of sound for frequencies between 1 kHz and 100 kHz of between 5000 m/sec and 1000 m/sec along the axis of the fiber and 1200 m/sec and 2000 m/sec transverse to the fiber length. 13. A sonar dome, the sonar dome comprising: a. a plurality of acoustical fibers, said acoustical fibers being selected to have a predetermined acoustical characteristic; b. a plurality of structural fibers, said structural fibers being selected to have a predetermined structural characteristic; c. said plurality of said acoustical fibers and said plurality of said structural fibers being formed into a blended yarn, said blended yarn being formed into a blended fabric; d. a solidified polymer resin, said blended fabric being incorporated within said solidified polymer resin. 14. The sonar dome of claim 13 wherein said blended yarn is formed of a mixture of said acoustical fibers and said structural fibers, said mixture of said acoustical fibers and said structural fibers being substantially stochastic. 15. The sonar dome of claim 14 wherein said predetermined acoustical characteristic of said acoustical fibers comprises: a one of said plurality of said acoustical fibers having a speed of sound for propagation of a sound of a selected frequency through said acoustical fiber, said speed of sound for said sound of said selected frequency propagating through said acoustical fiber approximating said speed of sound for said sound of said selected frequency propagating through water. 16. The sonar dome of claim 15, the sonar dome further comprising: a sonar window defined by said solidified polymer resin and by said blended fabric incorporated within said solidified polymer resin, said sonar window having a predetermined design wavelength of said sound, said blended fabric having a predetermined ratio of said acoustical fibers to said structural fibers, said predetermined ratio being selected based upon said pre-determined design wavelength of said sound. 17. The sonar dome of claim 16 wherein said window has a thickness, an inside surface and an outside surface, the sonar dome further comprising: said blended fabric being a one of a plurality of sold blended fabrics, said plurality of said blended fabrics being formed into a multiple-layered stack of said blended fabrics, said stack of said blended fabrics being incorporated within said solidified polymer resin, each of said plurality of said blended fabrics within said stack having a one of a plurality of said predetermined ratios of said acoustical fibers to said structural fibers, said one of said plurality of said predetermined ratios of said acoustical fibers to said structural fibers for said one of said plurality of said blended fabrics being determined by a location of said one of said plurality of blended fabrics within said stack of said blended fabrics. 18. The sonar dome of claim 17 wherein a one of said plurality of said blended fabrics located proximal to said inside surface of said window exhibits said predetermined ratio of said acoustical fibers to said structural fibers that is lower than said predetermined ratio exhibited by another one of said plurality of said blended fabrics that is located distal to said inside surface and said outside surface of said window, and another one of said plurality of said blended fabrics located proximal to said outside surface of said window exhibits said predetermined ratio of said acoustical fibers to said structural fibers that is lower than said predetermined ratio exhibited by another one of said plurality of said blended fabrics that is located distal to said inside surface and said outside surface of said window. 19. The sonar dome of claim 15 wherein said structural fiber has a structural fiber modulus of elasticity and wherein said acoustical fiber has an acoustical fiber modulus of elasticity, said structural fiber modulus of elasticity being greater than said acoustical fiber modulus of elasticity and wherein said structural fiber is selected from the list consisting of carbon fiber, aramid fiber and glass fiber. 20. The sonar dome of claim 14, said predetermined acoustical characteristic of said plurality of said acoustical fibers comprising: said acoustical fibers having a speed of sound for frequencies between 1 kHz and 100 kHz of between 5000 m/sec and 10000 m/sec along the axis of the fiber and 1200 m/sec and 2000 m/sec transverse to the fiber length.
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이 특허에 인용된 특허 (14)
Fanning Bryce L. (Dartmouth CAX) Curran Dennis T. (Halifax CAX) Elson Clive M. (Halifax CAX), Acoustic gel.
Rein Dimitry,ILX ; Vaykhansky Ley,ILX ; Cohen Yachin,ILX, Ultra-high molecular weight polyolefin fiber composite matrix, and process for the manufacture thereof.
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