EP0845098B1 - Asymmetric penetration warhead - Google Patents
Asymmetric penetration warhead Download PDFInfo
- Publication number
- EP0845098B1 EP0845098B1 EP96927859A EP96927859A EP0845098B1 EP 0845098 B1 EP0845098 B1 EP 0845098B1 EP 96927859 A EP96927859 A EP 96927859A EP 96927859 A EP96927859 A EP 96927859A EP 0845098 B1 EP0845098 B1 EP 0845098B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- warhead
- target
- missile
- nose
- penetration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
- F42B12/06—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type with hard or heavy core; Kinetic energy penetrators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
- F42B30/08—Ordnance projectiles or missiles, e.g. shells
Definitions
- the present invention relates to missiles or projectiles designed to reach and penetrate specific hardened targets. Such a projectile is described in US-A-4 085 678. This document is considered to be the closest prior art.
- a typical guided missile is commonly made up of a number of sections, which are housed in, or connected to a generally cylindrical housing of varying radius in the longitudinal direction.
- the guidance section which typically includes one or more sensors, such as a Forward Looking Infrared (FLIR) or video camera, and the various electronic systems which control the sensors, analyze and interpret the signals received by the sensors, and control the flight control system which positively determines the trajectory and the roll position of the missile.
- the guidance section may also include means for receiving signals from outside of the missile and may also include means for transmitting signals from the missile.
- the warhead which is typically a hollow cylindrically shaped casing, typically made of a high strength steel.
- the function of a penetration warhead is to penetrate a hardened target and place the explosive charge in the appropriate position, i.e., inside the target, at the moment of explosion, thereby maximizing the effect of the explosion on the target.
- Inside the hollow casing is placed the explosive and the rear end of the warhead lies the ignition fuse which is designed to be set off at the proper moment, typically, at some pre-determined time after the warhead encounters the target.
- the warhead is typically made of three sections: (1) a front section, or nose, which is usually in the shape of an ogive or cone; (2) the main section which includes the explosive charge and is usually cylindrical; and (3) the aft section which seals the explosive charge within the casing and holds the fuse.
- the flight control section housed in and connected to the housing at the rear of the missile, and in some cases also in other locations along the missile housing, is the flight control section, including fins and foils, which are used to adjust and stabilize the trajectory of the missile during its flight to the target and to prevent the missile from rolling during flight.
- the missile impact the target directly i.e., at a 90° to the target surface.
- the angle of impact is different, sometimes significantly, from the optimal 90°.
- a significant fraction of hardened targets such as command bunkers, and the like, are built into the ground and have an outer wall which is substantially horizontal.
- a typical guided missile would typically impact the outer wall at an angle which, in many cases, may be in the range of from about 45° to about 65°, substantially different from the optimal angle of 90°.
- the deviation of the impact from the perpendicular greatly reduces the penetration depth of the warhead into the target and significantly decreases the effectiveness of the explosion.
- DE-A-1 428 690 discloses a projectile featuring an asymmetric tip, such that when the projectile hits a target it creates forces which hasten the deviation of the projectile.
- the asymmetric tip of the projectile accelerates the inclination of the projectile upon impacting a target.
- a similar projectile is disclosed in US-A-3 282 214.
- An asymmetric tip of the projectile causes the projectile to ultimately travel in a broadside position that is transverse with respect to the travelled path of the projectile prior to impacting the target.
- US-A-3 949 677 discloses a projectile with an asymmetrical tip shaped to increase the rate of spin of the projectile during its penetration into a target.
- a penetration warhead in combination with a missile having defined up and down portions, said missile being position-controlled to ensure that the missile flies with the up portion oriented up and the down portion facing down and said missile being roll-stabilised to keep the angular position of the missile about its axis roughly constant, said warhead having a main axis and comprising a nose section which is asymmetric with respect to said main axis of the warhead, said asymmetry being selected so that upon impacting and penetrating a target, at an angle which deviates from a perpendicular to a surface of said target, the forces acting on said nose section by said target, create a moment about a warhead's center of gravity which directs the penetration warhead in a direction which is substantially toward the perpendicular to the surface of the target, thereby increasing the warhead's penetration depth into the target.
- the present invention successfully addresses the shortcomings of the presently known configurations by providing a penetration warhead or projectile which is shaped to include a nose section which is asymmetric with respect to its longitudinal axis.
- the warhead is mounted in a roll-stabilized, position-controlled, guided missile or projectile designed to penetrate a hardened concrete target or other highly resistant targets.
- Roll-stabilization relates to the keeping of the angular position of the missile about its axis roughly constant.
- Position control relates to ensuring that the missile is oriented so that the top portion is pointing up while the bottom portion is pointing down, i.e., to prevent the missile from flying with the wrong roll angle.
- the present invention is of a penetration warhead assembled in a roll-stabilized guided missile, smart bomb or warhead having a construction which significantly improves the penetration of the warhead into a target which is impacted at an angle which differs from the perpendicular.
- the invention is described in claim 1.
- Dependent claims 2-5 describe preferred embodiments.
- FIG. 1 Shown in Figure 1, is a schematic side cross-sectional view of a missile 10 which includes a guidance section 12 , a warhead 14 (which is described in greater detail below), with an explosive charge 15 , an engine section 16 and a flight control section 18 and tail fins 20 .
- Missile 10 is shown just prior to impact with a target 22 , at a certain angle, ⁇ , between the plane of the target and the main (longitudinal) axis of missile 10 .
- various warheads, bombs and projectiles are used for penetrating armored vehicles, such as tanks and thick concrete or similar other hard or hardened targets, typically made of concrete and further protected by layers of rock, soil and/or steel.
- warheads are symmetrical so that the performance of the missile is independent of its roll angle at the moment of impact between the missile and the target.
- the symmetry of the warhead is critical in missiles, bombs, and the like, which roll during flight so that it is not possible to predict the roll angle of the missile at the instant of impact.
- the nose of a conventional warhead has either an ogival or a conical front section ( Figures 2 and 3, respectively), both configurations being completely symmetrical with respect to the main axis of the warhead.
- a penetration warhead is to penetrate as deeply as possible into the target in order to place the explosives in the targeted space, or as close to it as possible.
- the extent of penetration of the warhead is greatly affected by the angle of impact, i.e., the angle between the main axis of the missile or warhead and the plane of the target.
- the warhead penetrates the target but tends to form a J-shaped path ( Figures 5).
- the diversion of the warhead from a straight line path is causes by an imbalance of forces on the nose of the warhead, as shown schematically in Figure 8 which induces a moment, M , tending to rotate the warhead about its center of gravity in a direction away from the target.
- M a moment
- the warhead comes to a stop with its nose pointing somewhat away from the target.
- the J-shaped path implies a decreased penetration of the warhead into the target.
- the present invention relates to a kinetic energy penetrating warhead which is designed to at least partly mitigate the negative effects of an angled impact of a hardened target.
- a warhead according to the present invention includes, in sharp contrast with known warheads, a front section, or nose, which is asymmetric with respect to the main axis of the warhead, the asymmetry is selected such that the forces acting on the nose of the warhead tend to create a moment about the warhead's center of gravity which tends to direct the penetrating warhead in a direction which is substantially toward the perpendicular, thereby increasing the warhead's penetration depth.
- a warhead according to the present invention is intended for use with guided missiles, projectile of smart bombs which do not roll, or are roll-stabilized, position-controlled and which are designed to penetrate hard and high value targets.
- the missile or bomb has defined up and down portions and impact takes place substantially with the lower portion of the system.
- the asymmetric configuration of the warhead makes it possible for the warhead to dig into the target by allowing the target counter forces to act on the warhead so as to counter and correct the tendency of the warhead to take a J-shaped path, as shown in Figures 8, 5 and 6.
- the forces acting on the nose of the warhead thus tend to create a moment, M , about the warhead's center of gravity which tends to direct the penetrating warhead in a direction which is substantially toward the perpendicular, thereby increasing the warhead's penetration depth.
- U.S. Pat. No. 603,466 to Hammer discloses projectiles with an asymmetric nose section and flanges to control the traveling direction of the projectiles (i.e., before impacting a target).
- the projectiles described by Hammer are not roll stabilized and/or position controlled.
- WO 82/03453 (PCT/AU82/00044) to Thomson disclose a missile having a directional control device which affects the symmetry of its nose section during traveling (i.e., again, before impacting a target).
- both Hammer and Thomson disclose projectiles having an oblique conical configuration at their anterior end, which configuration affects their aerodynamic progress or flight through air (or hydrodynamic progress through water), however, these configurations do not affect their penetration capabilities into a target in a manner that will create a moment about the center of gravity which directs the projectile in a direction which is substantially toward the perpendicular during penetration.
- these patents provide designs for controlling a projectile during its flight to the target, which designs are not at all applicable for controlling the projectile's behavior after impact (i.e., during penetration).
- Hammer describes a bullet which is fired from a firearm.
- a bullet and warhead of a missile which, as opposed to a bullet, includes explosives.
- Webster's dictionary defines a warhead as the forward section of a missile, bomb, torpedo, or the like, containing the explosive or payload.
- the present invention is not directed toward a missile having an oblique conical configuration at its anterior end. Flight or path control according to the missile of the present invention is effected via, for example, tail fins 20 (see Figure 1).
- U.S. Pat. No. 4,085,678 to Heincker discloses a projectile equipped with a warhead having a forward section and an aft section.
- the forward section has an asymmetric rear end, whereas the aft section has an asymmetric front end, such that these rear and front ends match one another.
- the forward section is used to penetrate a target, whereas the aft section includes the explosives and is intended to follow the forward section into the target.
- the warhead taught by Heincker does not have a nose section which is asymmetric with respect to the main axis of the warhead.
- the nose section of the warhead taught by Heincker is symmetric.
- Heincker teaches an aft section of a warhead which has an asymmetric front, however, that front is not intended for penetrating the target, as specifically explained on column 3, lines 41-53, of the Heincker patent.
- it is the front of the forward section of the warhead which is intended to penetrate the target, wherein the aft section merely follows the forward section, which is symmetric.
- Heincker's missile is not a position-controlled roll-stabilized missile, and therefore the roll position of the Heincker's missile upon impact is a matter of statistics.
- GB 539699 to Kent discloses an aerial bomb with a nose section equipped with a detachable part, such that, upon impacting a water body, the detachable part disintegrates and renders the nose section asymmetric.
- the asymmetry in this case is selected such that following impact (i.e., in water) the forces acting on the nose section tend to create a moment about the warhead's center of gravity which tends to direct the penetrating warhead in a direction which is substantially toward the horizontal (see Figure 8 therein).
- the bomb of Kent progresses in a path which becomes closer to the horizontal
- the warhead according to the present invention progresses in a path which becomes closer to the vertical.
- the bomb of Kent progresses away from the perpendicular
- the warhead according to the present invention progresses closer to the perpendicular.
- a symmetric warhead, as indicated by 104 would take an intermediate path (see also Figure 10A).
- FIGS 11 and 12 Shown in Figures 11 and 12 are a side and a front view of a nose design which includes a planar surface.
- the planar surface takes on the shape of an ellipse.
- the nose section is in the shape of an oblique cone, i.e., a cone which is asymmetric with respect to its base or, more importantly with respect to the main axis of the warhead whereas the cone tip can be at any designed distance from the warhead main axis.
- FIG. 15 and 16 Shown in Figures 15 and 16 is a nose section which is asymmetrically concave while the nose section in the embodiments of Figures 17 and 18 are asymmetrically convex.
- Figures 19 and 20 and in Figures 21 and 22 are two more configurations which are asymmetrically concave and convex.
Abstract
Description
Claims (5)
- A penetration warhead (14) in combination with a missile (10) having defined up and down portions, said missile (10) being position-controlled to ensure that the missile flies with the up portion oriented up and the down portion facing down and said missile (10) being roll-stabilised to keep the angular position of the missile about its axis roughly constant, said warhead (14) having a main axis and comprising a nose section which is asymmetric with respect to said main axis of the warhead (14), said asymmetry being selected so that upon impacting and penetrating a target (22), at an angle which deviates from a perpendicular to a surface of said target (22), the forces acting on said nose section by said target, create a moment about a warhead's (14) center of gravity which directs the penetration warhead (14) in a direction which is substantially toward the perpendicular to the surface of the target (22), thereby increasing the warhead's penetration depth into the target (22).
- The combination of claim 1, wherein said nose section includes a planar configuration at its anterior end.
- The combination of claim 1, wherein said nose section includes an oblique conical configuration at its anterior end.
- The combination of claim 1, wherein said nose section includes a convex configuration at its anterior end.
- The combination of claim 1, wherein said nose section includes a concave configuration at its anterior end.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL11497395A IL114973A (en) | 1995-08-17 | 1995-08-17 | Asymmetric penetration warhead |
IL11497395 | 1995-08-17 | ||
PCT/IL1996/000086 WO1997007379A2 (en) | 1995-08-17 | 1996-08-16 | Asymmetric penetration warhead |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0845098A2 EP0845098A2 (en) | 1998-06-03 |
EP0845098A4 EP0845098A4 (en) | 1999-04-07 |
EP0845098B1 true EP0845098B1 (en) | 2001-03-21 |
Family
ID=11067888
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96630047A Expired - Lifetime EP0760458B1 (en) | 1995-08-17 | 1996-08-14 | Asymmetric penetration warhead |
EP96927859A Expired - Lifetime EP0845098B1 (en) | 1995-08-17 | 1996-08-16 | Asymmetric penetration warhead |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96630047A Expired - Lifetime EP0760458B1 (en) | 1995-08-17 | 1996-08-14 | Asymmetric penetration warhead |
Country Status (8)
Country | Link |
---|---|
EP (2) | EP0760458B1 (en) |
AT (1) | ATE199978T1 (en) |
AU (1) | AU6753796A (en) |
BR (1) | BR9610411A (en) |
DE (1) | DE69611273T2 (en) |
ES (1) | ES2155196T3 (en) |
IL (1) | IL114973A (en) |
WO (1) | WO1997007379A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2503921C2 (en) * | 2012-03-15 | 2014-01-10 | Шепеленко Виталий Борисович | Rocket missile |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2414534A (en) * | 2003-03-25 | 2005-11-30 | Ruag Munition | Projectile comprising a sub-caliber penetrator core |
IL219010A (en) | 2012-04-03 | 2016-11-30 | Amon Jacob | Missile warhead |
CN103389014B (en) * | 2013-06-25 | 2015-04-08 | 西安电子科技大学 | System and method for positioning explosion site of penetrating bomb in shooting range |
CN109029158A (en) * | 2018-08-30 | 2018-12-18 | 南京理工大学 | A kind of controllable explosion-proof bullet based on bullet asymmetry |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4637313A (en) * | 1981-01-05 | 1987-01-20 | Avco Corporation | Earth penetrator |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US603466A (en) * | 1898-05-03 | Projectile | ||
GB539699A (en) * | 1939-12-08 | 1941-09-22 | Christopher William Kent | Improvements in and relating to aerial bombs |
US2464834A (en) * | 1945-03-16 | 1949-03-22 | Lawrence H Taylor | Method and apparatus for determining depth and current direction |
US2612108A (en) * | 1948-08-11 | 1952-09-30 | Benjamin F Schmidt | Projectile |
DE1428690A1 (en) * | 1964-08-04 | 1969-01-16 | Inst Nac De Ind | Rifle bullet |
US3282214A (en) * | 1964-12-14 | 1966-11-01 | Madison H Briscoe | Projectile |
US3401637A (en) * | 1966-09-28 | 1968-09-17 | Madison H. Briscoe | Broadside bullet |
DE2222785A1 (en) * | 1972-05-10 | 1973-11-22 | Messerschmitt Boelkow Blohm | INFANTRY FLOOR FOR COMBATING GROUND GOALS |
ES199626Y (en) * | 1974-01-19 | 1975-12-16 | Centro De Est. Tec De Mate. Esp. - Inst. Nac. Ind. | SMALL CALIBER PROJECTILE WITH ASYMMETRIC POINT. |
DE2457503C2 (en) * | 1974-12-05 | 1984-11-29 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Infantry bullet |
US4389028A (en) * | 1976-01-14 | 1983-06-21 | The United States Of America As Represented By The Secretary Of The Navy | Flat trajectory projectile |
US4085678A (en) * | 1977-04-25 | 1978-04-25 | The United States Of America As Represented By The Secretary Of The Air Force | Kinetic energy, impact-separated, follow-through ungula penetrator |
DE3267517D1 (en) * | 1981-04-08 | 1986-01-02 | Commw Of Australia | Directional control device for airborne or seaborne missiles |
US4554871A (en) * | 1983-11-21 | 1985-11-26 | Allied Corporation | Dispensed guided submunition |
US4998994A (en) * | 1989-09-20 | 1991-03-12 | The United States Of America As Represented By The Secretary Of The Army | Aerodynamically compliant projectile nose |
FR2673277B1 (en) * | 1991-02-26 | 1995-01-13 | Giat Ind Sa | HEAD STRUCTURE FOR A PROJECTILE WITH PERFORATING CHARACTER. |
DE4142116A1 (en) * | 1991-12-20 | 1993-06-24 | Weber Adolf Dipl Ing | Practice projectile for firing from cannon - has device for limiting firing range by alteration of air contact surfaces on point of projectile |
-
1995
- 1995-08-17 IL IL11497395A patent/IL114973A/en not_active IP Right Cessation
-
1996
- 1996-08-14 DE DE69611273T patent/DE69611273T2/en not_active Expired - Fee Related
- 1996-08-14 EP EP96630047A patent/EP0760458B1/en not_active Expired - Lifetime
- 1996-08-16 EP EP96927859A patent/EP0845098B1/en not_active Expired - Lifetime
- 1996-08-16 WO PCT/IL1996/000086 patent/WO1997007379A2/en active IP Right Grant
- 1996-08-16 ES ES96927859T patent/ES2155196T3/en not_active Expired - Lifetime
- 1996-08-16 BR BR9610411-2A patent/BR9610411A/en not_active IP Right Cessation
- 1996-08-16 AU AU67537/96A patent/AU6753796A/en not_active Abandoned
- 1996-08-16 AT AT96927859T patent/ATE199978T1/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4637313A (en) * | 1981-01-05 | 1987-01-20 | Avco Corporation | Earth penetrator |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2503921C2 (en) * | 2012-03-15 | 2014-01-10 | Шепеленко Виталий Борисович | Rocket missile |
Also Published As
Publication number | Publication date |
---|---|
DE69611273D1 (en) | 2001-01-25 |
WO1997007379A3 (en) | 1997-05-22 |
IL114973A (en) | 2000-07-26 |
ATE199978T1 (en) | 2001-04-15 |
IL114973A0 (en) | 1996-06-18 |
EP0845098A4 (en) | 1999-04-07 |
BR9610411A (en) | 1999-12-21 |
ES2155196T3 (en) | 2001-05-01 |
AU6753796A (en) | 1997-03-12 |
EP0760458B1 (en) | 2000-12-20 |
EP0845098A2 (en) | 1998-06-03 |
DE69611273T2 (en) | 2001-08-09 |
WO1997007379A2 (en) | 1997-02-27 |
EP0760458A1 (en) | 1997-03-05 |
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