Understanding the Principle and Operation of an Airplane's Hydraulic System!

Hello, this is ten, today we will talk about the

hydraulic

system

of an

airplane

, first let's see what a

hydraulic

system

is. This is a system that uses pressurized hydraulic fluid to move different components of an aircraft. These components could include flight controls, landing, extension and retraction and brakes. Now let's look at the

principle

of the hydraulic system. The

operation

of this system is based on Pascal's law. To understand this law, let's consider a closed container that is filled with fluid. Hydraulic according to Pascal's law, if a pressure acts on this fluid, it will be transmitted equally in all directions and will act perpendicular to the surface of the container.

Now let's look at the application of Pascal's law. We first consider a force acting on the fluid in this section. Let this force be one thousand pounds, the cross-sectional area. In this section the pressure of a square inch is defined as force per area, so we get the pressure in this section as one thousand pounds per square inch or one thousand psi. Now let's consider another section here that has the same cross-sectional area of ​​one square inch. The pressure would be the same thousand psi, therefore the force we get in this section would be one thousand pounds.

Now let's increase the area in this section to two square inches, the pressure is again one thousand psi, but if we calculate the force we get two thousand pounds. the same pressure by simply increasing the area we can increase the force in this part of the container, this is called the stress end where the pressure needs to be created, this is called the load end which can be connected to different components that need to be moved by changing the area at the loading end, the force is modified depending on the requirement with this

principle

. Now let's look at the aircraft's hydraulic system, reviewing the components that make up the system.

Every hydraulic system must have a Holstee hydraulic reservoir. fluid that we only needed for the system this is the supply line that supplies the required fluid this is the return line in which the fluid returns to the reservoir the reservoir can be pressurized so that a positive flow is maintained in the supply line the pressurization It can be done by taking lead air from the engine or APU. The next component we will look at are the pumps. Pumps are used to pressurize the hydraulic fluid. The pump could be motor driven or it could be an electrically operated pump.

A manual pump can be Provided that the motors and power supply are not available during normal

operation

of the pump, it must be able to supply fluid at constant pressure. The next component we will look at are the filters. Filters are used to remove any particles or impurities from the fluid. It is important because it prevents damage to the hydraulic system. They can be installed only in the supply line, return line and also before critical components as the fluid enters and leaves the filter, fluid impurities accumulate in the filter. The next component we will look at. are valves valves are used to control and regulate the flow of fluid there are different types of valves that are used for different functions first we will look at check valves the check valve allows the fluid to flow in one direction only if the fluid enters from This side is allowed to flow to the other side, but if fluid enters this side, the check valve closes and fluid cannot flow to the other side.

Next we will see the shut-off valve. This valve shuts off the hydraulic fluid from the system. During emergencies such as a leak or pump failure, when this valve closes, it prevents fluid from entering or leaving the valves. Next we will look at pressure reducing valves. This valve is used to reduce the pressure of the hydraulic fluid in a particular line if the fluid enters here in this line the fluid will have the same pressure but in this line the pressure will be less. Next we will see the selector valves. This valve changes the direction of the pressurized fluid.

This is done by turning the valve depending on which side. pressurized fluid is required the next component we will look at is the actuator which is used to convert hydraulic pressure into mechanical action if the fluid enters here the piston in the actuator moves in this direction and the fluid from the other side is sent back to the reservoir in a similar way if the fluid enters from this side the piston moves in this direction and the fluid from the other side returns to the reservoir this actuator can be connected to the primary or secondary flight controls the landing gear brakes and the direction of the nose wheel The next component we will look at is the accumulator.

The accumulator contains pressurized hydraulic fluid. The fluid and air inside the accumulator are separated by a diaphragm. The accumulator is used to provide constant pressure fluid to the actuators whenever there is high demand and sufficient pressure. is not available, it is also the last source of pressure during emergencies such as pump failure, pressure in the supply line drops. All of these components form a basic hydraulic system that is used in an

airplane

to complete the system, it must have a return line. which has a separate filter to prevent impurities from entering the tank. The advantages of this system are that it can be used to operate different components.

It is easy to install and provides food for the constant movement of fluid-operated components. used must have a high boiling point, a low freezing point and must flow freely under all operating conditions. Thanks for watching and subscribe.