IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0327550
(2008-12-03)
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등록번호 |
US-7832336
(2011-01-16)
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발명자
/ 주소 |
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출원인 / 주소 |
- Lockheed Martin Corporation
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
11 |
초록
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A method for operating a thrust-generating supercavitating projectile involves launching the projectile at a velocity above the minimum required to maintain supercavitating movement, delaying initiation of thrust until the projectile slows to a velocity that is near that minimum velocity, and then a
A method for operating a thrust-generating supercavitating projectile involves launching the projectile at a velocity above the minimum required to maintain supercavitating movement, delaying initiation of thrust until the projectile slows to a velocity that is near that minimum velocity, and then applying thrust to maintain the near-minimum velocity until a target is reached.
대표청구항
▼
What is claimed is: 1. A method for operating a supercavitating projectile, comprising: launching a thrust-generating, supercavitating-capable projectile in water in excess of a first velocity required to create and sustain supercavitating movement of the projectile; delaying initiation of thrust u
What is claimed is: 1. A method for operating a supercavitating projectile, comprising: launching a thrust-generating, supercavitating-capable projectile in water in excess of a first velocity required to create and sustain supercavitating movement of the projectile; delaying initiation of thrust until the projectile slows to a second velocity that is within about 10 miles per hour of the first velocity; and applying thrust when the second velocity is reached, wherein the amount of thrust applied maintains the first velocity until a target is reached. 2. The method of claim 1 wherein the projectile has a nose and a body, and wherein the ratio of a diameter of the body, DB, to a diameter of the nose, DN, is about 4.1. 3. The method of claim 1 wherein the amount of thrust, F, applied is approximately: F=12DN2P, wherein: DN is the diameter of the projectile's nose; and P is the static drag on the projectile. 4. The method of claim 1 wherein the first velocity is about 4.265Vc, wherein Vc is the characteristic velocity. 5. A method for operating a supercavitating projectile, comprising: launching a thrust-generating, supercavitating-capable projectile in water at a depth, H, and in excess of a first velocity required to create and sustain supercavitating movement of the projectile; delaying initiation of thrust until the projectile slows to a second velocity that is within about 10 miles per hour of the first velocity; and applying thrust when the second velocity is reached, wherein the amount of thrust, F, applied maintains the first velocity until a target is reached, and wherein the depth H is no more than a value given by the expression: H=(F/(12DN2)−ATM)/(ρwaterg), wherein: DN is the diameter of the projectile's nose; ATM is the water pressure bearing on the projectile; ρwater is the density of the water at the relevant temperature; and g is the acceleration due to gravity. 6. A method for operating a supercavitating projectile, comprising: launching a thrust-generating, supercavitating-capable projectile in water at a depth, H, and in excess of a first velocity required to create and sustain supercavitating movement of the projectile; delaying initiation of thrust until the projectile slows to a second velocity that is within about 10 miles per hour of the first velocity; and applying thrust when the second velocity is reached, wherein the amount of thrust, F, applied maintains the first velocity until a target of the projectile is reached, and wherein the projectile has a nose, the diameter of which, DN, is given by the expression: DN=0.29×(F/(ρwatergH+ATM)0.5 wherein: H is the depth of the projectile under water; ATM is the water pressure bearing on the projectile; ρwater is the density of the water at the relevant temperature; and g is the acceleration due to gravity. 7. A method for operating a supercavitating projectile, comprising: launching a thrust-generating, supercavitating-capable projectile in water in excess of a first velocity required to create and sustain supercavitating movement of the projectile; delaying initiation of thrust until a time t1, wherein time t1 is given by the expression: t1=[1/(KVc)]×[tan−1(V0/Vc)−tan−1(cVsc/Vc)] wherein: K=(Π/8 m)×ρwaterDN2Cd0; m is the mass of the projectile; ρwater is the density of the water at the relevant temperature; DN is the diameter of the projectile's nose; Cd0 is the drag coefficient under supercavitation; c is a parameter used for specifying thrust; Vc is the characteristic velocity: Vc=(2P/ρwater); and P is the static drag; and applying thrust when time t1 is reached, wherein the amount of thrust, F, applied maintains the projectile in supercavitating movement. 8. The method of claim 7 wherein in the operation of applying thrust, thrust is applied for a time t2, wherein time t2 is given by the expression: t2={R−(½K)×ln [(V02+Vc2)/(c2Vsc+Vc2)]}/cVsc wherein: V0 is the velocity of the projectile at launch; and R is the distance to a target of the projectile.
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