Methods for extended-range, enhanced-precision gun-fired rounds using g-hardened flow control systems

Patent metadata

Field	Value
Publication number	US-9939240-B1
Application number	US-201715489859-A
Country	US
Kind code	B1
Filing date	Apr 18, 2017
Priority date	Feb 18, 2013
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Methods involve using a guided munition (e.g., a mortar round or a grenade) that utilizes deployable flow effectors, activatable flow effectors and/or active flow control devices to extend the range and enhance the precision of traditional unguided munitions without increasing the charge needed for launch. Sensors such as accelerometers, magnetometers, IR sensors, rate gyros, and motor controller sensors feed signals into a controller which then actuates or deploys the flow effectors/flow control devices to achieve the enhanced characteristics.

First claim

We claim:

1. A method of increasing both the range and the precision of a munition comprising:
firing or launching from a smooth-bore barrel a g-hardened munition comprising a forebody, an afterbody, at least one independently adjustable activatable or deployable flow effector mounted so as to have stillness relative to the munition on launch and adapted to extend the range and enhance the precision of the munition, at least one g-hardened actuator corresponding to the at least one flow effector, a g-hardened sensor suite comprising at least one accelerometer, at least one gyroscope, and at least one infrared (IR) sensor, each sensor having a signal, and a g-hardened microcontroller adapted to process the signals from the sensors and provide an output to actuate and control the at least one flow effector;
activating or deploying the at least one flow effector during flight, and
independently adjusting or controlling the at least one flow effector based at least in part on the output of the microcontroller and sensor signals resulting in increasing both the range and the precision of the munition,

wherein the munition experiences a launch or firing acceleration of more than 10,000 g's.

2. The method of claim 1 , wherein the munition experiences a launch or firing acceleration of more than 16,000 g's.

3. The method of claim 1 , wherein the munition experiences a launch or firing acceleration of more than 18,000 g's.

4. The method of claim 1 , wherein step of independently adjusting or controlling the at least one flow effector is performed by independently adjusting the angle of attack of the canards using a geared transmission located inside of the munition body to stabilize the munition to eliminate spin and lift the munition forebody with respect to the afterbody.

5. The method of claim 1 , wherein the sensor suite further comprises a global positioning system (GPS) sensor.

6. The method of claim 5 , wherein the microcontroller is further adapted to determine the munition's relative position with respect to a moving target or target location and to adjust the flow effectors to redirect the munition towards the target or target location.

7. The method of claim 1 , wherein the sensor suite further comprises a pressure sensor, shear stress sensor of inertial measurement system adapted to measure flow dynamics on a flow surface of the munition, and the flow effectors are independently adjusted based further in part on the measured flow dynamics.

8. A method of increasing both the range and the precision of a munition comprising:
firing or launching from a smooth-bore barrel a g-hardened munition comprising a forebody, an afterbody, at least two independently adjustable activatable or deployable flow effectors mounted so as to have stillness relative to the munition on launch and adapted to extend the range and enhance the precision of the munition, at least one g-hardened actuator corresponding to each of the at least two flow effectors, a g-hardened sensor suite comprising at least one accelerometer, at least one gyroscope, and at least one infrared (IR) sensor, each sensor having a signal, and a g-hardened microcontroller adapted to process the signals from the sensors and provide an output to actuate and control the at least two flow effectors; and
activating or deploying the at least two flow effectors independently during flight, and independently adjusting or controlling the at least two flow effectors based at least in part on the output of the microcontroller and sensor signals resulting in increasing both the range and the precision of the munition,

wherein the munition experiences a launch or firing acceleration of more than 10,000 g's, at least one of the at least two flow effectors is a canard positioned on the munition forebody.

9. The method of claim 8 , wherein the munition experiences a launch or firing acceleration of more than 16,000 g's.

10. The method of claim 8 , wherein the munition experiences a launch or firing acceleration of more than 18,000 g's.

11. The method of claim 8 , wherein the angles of attack of the at least two flow effectors are independently adjusted or controlled after activation or deployment by a beveled gear reduction mechanism corresponding to each flow effector located inside of the munition body.

12. The method of claim 8 , wherein the sensor suite further comprises a global positioning system (GPS) sensor.

13. The method of claim 12 , wherein the microcontroller is further adapted to determine the munition's relative position with respect to a moving target or target location and to adjust the flow effectors to redirect the munition towards the target or target location.

14. The method of claim 8 , wherein the sensor suite further comprises a pressure sensor, shear stress sensor of inertial measurement system adapted to measure flow dynamics on a flow surface of the munition, and the flow effectors are independently adjusted based further in part on the measured flow dynamics.

15. A method of increasing both the range and the precision of a munition comprising:
firing or launching from a smooth-bore barrel a g-hardened munition comprising a forebody, an afterbody, at least two independently adjustable activatable or deployable flow effectors mounted so as to have stillness relative to the munition on launch and adapted to extend the range and enhance the precision of the munition, at least one g-hardened actuator corresponding to each of the at least two flow effectors, a g-hardened sensor suite comprising at least one accelerometer, at least one gyroscope, and at least one infrared (IR) sensor, each sensor having a signal, and a g-hardened microcontroller adapted to process the signals from the sensors and provide an output to actuate and control the at least two flow effectors;
activating or deploying the at least two flow effectors independently during flight, and independently adjusting or controlling the at least two flow effectors based at least in part on the output of the microcontroller and sensor signals resulting in increasing both the range and the precision of the munition,
wherein the munition experiences a launch or firing acceleration of more than 10,000 g's, at least one of the at least two flow effectors is a canard positioned on the munition forebody, and the angles of attack of the at least two flow effectors are independently adjusted or controlled after activation or deployment by a beveled gear reduction mechanism corresponding to each flow effector located inside of the munition body.

16. The method of claim 15 , wherein the munition experiences a launch or firing acceleration of more than 16,000 g's.

17. The method of claim 15 , wherein the munition experiences a launch or firing acceleration of more than 18,000 g's.

18. The method of claim 15 , wherein the sensor suite further comprises a global positioning system (GPS) sensor.

19. The method of claim 18 , wherein the microcontroller is further adapted to determine the munition's relative position with respect to a moving target or target location and to adjust the flow effectors to redirect the munition towards the target or target location.

20. The method of claim 15 , wherein the sensor suite further comprises a pressure sensor, shear stress sensor of inertial measurement system adapted to measure flow dynamics on a flow surface of the munition, and the flow effectors are independently adjusted based further in part on the measured flow dynamics.

Assignees

• Vasudevan Srikanth
• Suchy Paul
• Birch Matthew C
• Orbital Res Inc

Inventors

• Vasudevan Srikanth
• Suchy Paul
• Birch Matthew C

Classifications

• F42B10/44

  Boat-tails specially adapted for drag reduction · CPC title

• F42B30/10

  Mortar projectiles · CPC title

• F42B10/62

  Steering by movement of flight surfaces · CPC title

• F41G7/222

  for spin-stabilized missiles · CPC title

• F41G7/2253

  Passive homing systems, i.e. comprising a receiver and do not requiring an active illumination of the target · CPC title