27-07-2012, 11:08 AM
STEALTH TECHNOLOGY
stealth new.ppt (Size: 6.98 MB / Downloads: 313)
WHAT IS STEALTH TECHNOLOGY
Stealth technology also known as LO technology (low observable technology)
The concept of stealth is to operate or hide without giving enemy forces any indications as to the presence of friendly forces.
This concept was first explored through camouflage by blending into the background.
Varying degrees of stealth can be achieved in a particular design by the prediction of likely threat capabilities.
STEALTH PRINCIPLES
Stealth technology (or LO for "low observe ability") is not a single technology but It is a combination of technologies as below
Radar cross section reductions
Acoustics
Visibility
Infrared
Reducing radio frequency emissions
Vehicle shape
Aircraft shape makes a significant difference in detectability.
Another important factor is the internal construction.
Behind the skin of some aircraft are structures known as re-entrant triangles. Radar waves penetrating the skin of the aircraft get trapped in these structures, bouncing off the internal faces and losing energy
Stealth design must bury the engines within the wing or fuselage.
Planform alignment is also often used in stealth designs which returns a radar signal in a direction away from the radar emitter.
VISIBILITY
The simplest stealth technology is simply camouflage; the use of paint or other materials to color and break up the lines of the vehicle or person.
Most stealth aircraft use RAM paint and dark colors, and operate only at night.
In daylight, against the clear background of the sky, dark tones are easier to detect than light ones or as a sort of active camouflage.
INFRA-RED
An exhaust plume contributes a significant infrared signature. One means of reducing the IR signature is to have a non-circular tail pipe order to minimize the exhaust cross-sectional volume and maximize the mixing of the hot exhaust with cool ambient air.
Often, cool air is deliberately injected into the exhaust flow to boost this process.
Sometimes, the jet exhaust is vented above the wing surface in order to shield it from observers below.
Another way to reduce the exhaust temperature is to circulate coolant fluids such as fuel inside the exhaust pipe, where the fuel tanks serve as heat sinks cooled by the flow of air along the wings.
stealth new.ppt (Size: 6.98 MB / Downloads: 313)
WHAT IS STEALTH TECHNOLOGY
Stealth technology also known as LO technology (low observable technology)
The concept of stealth is to operate or hide without giving enemy forces any indications as to the presence of friendly forces.
This concept was first explored through camouflage by blending into the background.
Varying degrees of stealth can be achieved in a particular design by the prediction of likely threat capabilities.
STEALTH PRINCIPLES
Stealth technology (or LO for "low observe ability") is not a single technology but It is a combination of technologies as below
Radar cross section reductions
Acoustics
Visibility
Infrared
Reducing radio frequency emissions
Vehicle shape
Aircraft shape makes a significant difference in detectability.
Another important factor is the internal construction.
Behind the skin of some aircraft are structures known as re-entrant triangles. Radar waves penetrating the skin of the aircraft get trapped in these structures, bouncing off the internal faces and losing energy
Stealth design must bury the engines within the wing or fuselage.
Planform alignment is also often used in stealth designs which returns a radar signal in a direction away from the radar emitter.
VISIBILITY
The simplest stealth technology is simply camouflage; the use of paint or other materials to color and break up the lines of the vehicle or person.
Most stealth aircraft use RAM paint and dark colors, and operate only at night.
In daylight, against the clear background of the sky, dark tones are easier to detect than light ones or as a sort of active camouflage.
INFRA-RED
An exhaust plume contributes a significant infrared signature. One means of reducing the IR signature is to have a non-circular tail pipe order to minimize the exhaust cross-sectional volume and maximize the mixing of the hot exhaust with cool ambient air.
Often, cool air is deliberately injected into the exhaust flow to boost this process.
Sometimes, the jet exhaust is vented above the wing surface in order to shield it from observers below.
Another way to reduce the exhaust temperature is to circulate coolant fluids such as fuel inside the exhaust pipe, where the fuel tanks serve as heat sinks cooled by the flow of air along the wings.