2. ABSTRACT
INTRODUCTION
PASCAL’S LAW
HYDROSTATIC PARADOX
HYDRAULIC FLUID
1. MINERAL BASED FLUID
2. SYNTHETIC FLUID
SYSTEM COMPONENTS
1.RESERVOIRS
2.PUMPS
3.VALVES
4.ACCUMULATORS
5.ADVANTAGES & DISADVANTAGES
6.GENERAL USES
3. The main aspect of designing an aircraft is to reduced
its weight . The hydraulically operated system are
comparatively light in weight from other system used
in aircraft. It can provide unlimited power for various
operations, and high power producing capacity is the
major advantage of hydraulic power system.
The operations such as wing slab control , landing
gears , braking system requires very high safety and
hydraulically operated system ensures the safety .
4. Hydraulic system
It is the system where liquid under pressure is used to transmit
the energy to various applications
Hydraulic system take engine power and convert it into
hydraulic power by means of hydraulic pump.
This power can be distributed throughout the airplane by
means of tubing that runs through the aircraft
5. Pascal’s Law
Pressure exerted on a fluid in an enclosed container is transmitted
equally and undiminished to all parts of the container and acts as
right angles to the enclosing walls.
6. Hydrostatic Paradox
The pressure exerted by a column of liquid is determined by the
height of the column and is independent of its volume.
7. The fluid used in aircraft hydraulic systems is one of the
system’s most important parts.
The fluid must flow with a minimum of opposition.
Must be incompressible
Good lubricating properties
Inhibit corrosion and not attack seals
Must not foam in operation
The fluid must be chemically stable
11. Reservoirs
It holds an extra supply of fluids for systems from which oil was
drawn when needed, or oil was return to it when not needed
FUNCTIONS
1.To store the liquid
2.Provide free space for expantion of the fluid
3.Provide a place to remove air or foam from the liquid
13. Pumps
• The pump is necessary to create a flow of the liquid
• The main function of pump is to change mechanical
horsepower to hydraulic horsepower
Types
• Hand pump
• Power driven
14. Valves
Selector valve- selector valve is used to direct the flow of the fluid
Check Valve- check valve allows the fluid in one direction only
System relief valve- It relives pressure on system for a safety
15. Accumulators
It acts as shock absorbers.
It stores enough fluid under pressure to provide emergency
operations of certain actuating units.
21. Landing gears aviation is the structure that
supports an aircraft on the ground and allows it
to taxi, take off and landing
22. 1. It is lighter in weight
2. It can be easily maintained
3. It is not a shock hazard , it is not much of fire hazard
4. It can developed practically unlimited force or torque
5. it is reliable
23. 1. Required more space (pumps , hydraulic lines etc).
2. Contamination (wear failure).
3. Initial investment is high.
24. Used for flight control , actuation of flaps , slats , weapons ,
landing gears , breaks.
Provides the extra force required to move large control surface
in heavy aerodynamics loads.
25. Aircraft hydraulic systems are 100% efficient than
other system
Aircraft hydraulic systems are light weight , easy for
installation, simplification of inspection.
Aircraft hydraulic systems have minimum
maintenance.
26. Reference to a journal publication:
● WILLIAM NEESE, A. AIRCRAFT HYDRAULIC
SYSTEMS, Pearson edu.
Reference to a conference publication:
● Brown D. N. and J. C. Jorgensen Machine Condition
Monitoring Using Vibration
Analysis, Bruel&Kjaer Application Notes.
Reference to web sites
● http://usmilitary .about.com/od(air force
nlistedjobes/afjob2a6*5.pdf)
