文档介绍：PNEUMATICS General
Pneumatics, from the Greek ｹνευματικός
(means - coming from the wind)
Pneumatics was first
Pascal's principle, states that pressure is constant throughout a static fluid.
Pneumatics are generally used for applications involving less force than hydraulic applications.
Pneumatics may be contrasted with hydraulics, which uses incompressible liquid media such as oil or water instead of air.
Air is compressible, is considered to be a fluid, and most industrial applications use approximately 80 to 100 pounds per square inch (psi) gauge pressure, as compared to hydraulics which are commonly used from 1,000 to 5,000 psi, and in some cases 10,000 psi and higher.
Both pneumatics and hydraulics are applications of fluid power. Physical pneumatic principles conclude that the pressure that forms in compressible liquids can be harnessed to a high potential of power.
Pneumatic systems can provides compressed air at a constant flow rate to air conditioning units, where its temperature is controlled and it is ducted into the cabin.
Pressurization systems, restricts the escape of air from the cabin to maintain proper pressurization in the cabin.
The pneumatic system also provides compressed air for engine starting.
The engine compressors, auxiliary power unit, or a ground unit can be used to supply the pneumatic system. The pneumatic manifold is normally supplied from the engines. The APU or an external air source may also be used.
Instructional purposes only
PNEUMATICS - APPLICATIONS
APPLICATIONS Some examples
Pressurization
Anti-ice
De-ice
Rain removal
Lift enhancement
Air conditioning
Engine starting
Pneumatic braking
Other