# Aircraft Hydraulics

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Q1) Explain the various principles involved with hydraulic fluids (P1)
There are 4 types
PASCAL’S LAW
DIFFRENTIAL AREAS
BRAMAH’S PRESS
BERNOULL’S PRINCIPLE

Pascal’s Law
Pascal’s law defines the fundamental principle of power transmission by hydraulic system. The Pascal’s Law is the main principle behind all hydraulic systems. It is stated pressure is an enclosed container is transmitted equally and undiminished to all parts of the container and acts at right angles to enclosed walls. The size, shape and volume is irrelevant. There are two main equation in equations in hydraulic system these are applied in order to calculate the parameters.

(1) Force (N) = [(Area) (m2)] X [(Pressure) (Pa)]

Using the above equation any of the variables can be found
As per this equation lesser the area more the force the force applied

An important relationship in hydraulics is the area of a piston, the distance it moves and the volume of fluid displaced.

In hydraulics mechanical devices are used called actuators, these Actuators consist of an encased movable piston.

(2) Volume = Area X Distance

Using this equation the volume required to move the piston with an area by a
Certain distance can be determined or any other variable in mind.

DIFFERENTIAL AREAS

Differential areas this is caused by the area of the piston being reduced on one side by an amount equal to the cross sectional area of the piston rod. The movement of the piston depends on the pressure of the fluid and the area of the position if there is no cavitation.

THE BRAMAH’S PRESS
It is acceptable that fluid pressure acts equally in all directions and that the load, which can be moved by a piston, depends upon the pressure and the piston area. BRAMAH Stated, “Under a given load, the smaller the area its acts upon the greater the pressure produced and “The greater the area under pressure, the greater the force available.”

BERNOULLI’S PRINCIPLE

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