Aircraft Actuators and its types

             Introduction to Actuator

                                                       

                An actuator is a component of a hydraulic system that is responsible for moving and controlling a mechanism of piston rod and the piston rod is connected to the aircraft systems. An actuating cylinder transforms energy in the form of fluid pressure into mechanical force. It is used to impart powered linear motion to some movable object or mechanism.
A typical actuating cylinder consists of a cylinder housing, one or more pistons and piston rods, and some seals. The piston inside the cylinder moves forward and backward and an attached piston rod moves into and out of the cylinder housing in accordance with piston. Seals are use to prevent the flow or leakage of fluid between two compartments of the cylinder . Fluid can be air or hydraulic fluid like Skydrol .

Actuating cylinders are of two major types:

➢ Single action :The single-action (single port) actuating cylinder is capable of producing powered movement in one direction only.A three-way control valve is normally used for controlling the operation of a single-action actuating cylinder.
➢ Double-action : (two ports) actuating cylinder is capable of producing powered movement in two directions.The operation of a double-action actuating cylinder is usually controlled by a four-way selector valve .

❖ Linear Actuator

• A linear actuator is an actuator that creates motion in a straight line.Double action linear actuator is used in aircraft  for the extension and retraction of the landing gear.
                                                    : Linear Actuator


❖ Rotary actuator

• A rotary actuator is an actuator that creates motion in rotational axis.In simple word, it produces torque and rotating motion .It is used in the NSW (Nose Steering Wheel ) of an aircraft.
                                                   :Rotary Actuator


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