US 20050016408 A1
On-Board Power Generation System for a Guided Projectile eliminates the need for batteries as a power source to power the guiding mechanism residing inside the projectile. Instead, an electrical generator and a wind-driven turbine to drive the generator are utilized to produce power. In this way, a small portion of the projectile's kinetic energy is converted into electrical energy. The power thusly produced is, then, coupled to the guiding means. The projectile is appropriately configured to accommodate therein the power generation system and air inlets and exhaust ports that are necessary to enable the system to operate.
7. In a projectile having a means therein for guiding said projectile during its flight toward a selected target, said projectile further having a housing, an aft end and a longitudinal axis and rotating during flight in a first direction about said axis, a system for generating voltage output to power said guiding means, said generating system residing in said projectile and comprising: a turbine positioned within said housing, said turbine having a plurality of vanes; an electrical generator coupled to said turbine; an exhaust port located at said aft end to allow any exhaust gases to escape; a plurality of inlet holes, said inlet holes being located on said housing and being positioned so as to allow air to enter therethrough and impinge on said vanes and cause said vanes to rotate in a second direction; and a means for coupling said generator to said turbine so as to enable said turbine to drive said generator and cause said generator to produce voltage output, said voltage output being input to said guiding means to power said guiding means.
8. A system for generating power for a guided projectile as set forth in
9. A system for generating power as set forth in
The invention described herein may be manufactured, used and licensed by or for the Government for governmental purposes without the payment to us of any royalties thereon.
The U.S. military forces currently are facing a variety of low-cost air-borne threats that include unguided rockets, mortars, unmanned aerial vehicles and cruise missiles. The traditional response to these threats has been to engage them with sophisticated guided missiles. Such guided missile engagements are technically viable but very expensive. A more cost-effective means of countering the low-cost threats would be to use guided medium caliber (20 mm-40 mm) projectiles.
Such projectiles can be launched out of guns that are positioned on combat vehicles. Guns possess significant operational advantages over other weapon systems in local air defense and other close engagements, the primary advantage being a significant increase in the number of stowed kills. Hundreds of medium caliber gun rounds can be stored in the same space as ten missiles. Additionally, bullets carry a substantial cost savings over missile systems, thereby allowing a more liberal use during the battle.
However, to be effective, guns must have some capabilities that are not normally required by an artillery system: specifically, a very short targeting time, capability against highly agile targets and enhanced precision. Guided smart munitions would provide such capabilities. Further, they would alleviate any targeting errors that may result from launch biases and improve lethality by allowing enhanced aimpoint selection.
A critical aspect in the development of guided projectiles is the power generation to provide power to the guiding means that will reside inside the projectiles. The power generating means must be lightweight and suitable for incorporation into an environment that has limited space and is subject to significant spin rates and high shock loading.
Traditional and thermal batteries are not suitable for use as power sources for guided projectiles due to their size and relatively short shelf life. On-Board Power Generation System for a Guided Projectile does away with the need for the battery by utilizing, instead, an electrical generator to produce power and a wind-driven turbine to drive the generator. In this way, a small portion of the projectile's kinetic energy is converted into electrical energy. The power output of the generator is, then, coupled to the guiding means. The projectile is appropriately configured to accommodate therein the power generation system and the air inlets and exhaust ports necessary to enable the system to function.
Referring now to the drawing wherein like numbers represent like parts in each of the several figures, arrowheads indicate signal travel and the direction of the flight of guided projectile 100 is to the right, the configuration and operation of the On-Board Power Generation System for a Guided Projectile is explained in detail.
As shown in
The On-Board Power Generation System to provide the necessary power to the guiding means comprises cylindrical hole 201 drilled from air inlet 109 through the middle of the projectile to exhaust ports 105, turbine 205 mounted at the end of the cylindrical hole near the exhaust ports and electrical generator 209 coupled to the turbine. As the air stream passes over the turbine, the vanes of the turbine turn in a direction that is opposite of the rotation direction of the projectile. The relative positions of the vanes to each other at any given point in time during their rotation is indicated by the slanted lines, as shown in
Electrical generator 209 is coupled to turbine 205 by shaft 207. As illustrated in
An alternate embodiment, illustrated in
Although particular embodiments and forms of this invention have been illustrated, it is apparent that various modifications and other embodiments of the invention may be made by those skilled in the art without departing from the scope and spirit of the foregoing disclosure. One modification is to add high-speed bearings 301 adjacent to shaft 207 as shown in